<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:0eb74482-b577-4d25-a261-7bcf43b86c83,g:b3ad5cfa-d6a2-4f3e-8726-336e151c15d7-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.aa.com/role/Cover" xlink:type="simple" xlink:href="aal-20251231.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_970a8439-a5a0-4c2b-98ff-581db1f85282" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_DocumentInformationTable_970a8439-a5a0-4c2b-98ff-581db1f85282" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_8b84a10d-2c7f-43a9-b929-431af62986c6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_970a8439-a5a0-4c2b-98ff-581db1f85282" xlink:to="loc_dei_LegalEntityAxis_8b84a10d-2c7f-43a9-b929-431af62986c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_8b84a10d-2c7f-43a9-b929-431af62986c6_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_8b84a10d-2c7f-43a9-b929-431af62986c6" xlink:to="loc_dei_EntityDomain_8b84a10d-2c7f-43a9-b929-431af62986c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_55433f9a-5ac3-49c2-80ea-f5b41928b460" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_8b84a10d-2c7f-43a9-b929-431af62986c6" xlink:to="loc_dei_EntityDomain_55433f9a-5ac3-49c2-80ea-f5b41928b460" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_e06b70c3-db82-4da4-ab2b-9a86d2c2921a" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_55433f9a-5ac3-49c2-80ea-f5b41928b460" xlink:to="loc_aal_AmericanAirlinesIncMember_e06b70c3-db82-4da4-ab2b-9a86d2c2921a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_660504c8-3153-45fa-92e9-bee9fa68117c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_970a8439-a5a0-4c2b-98ff-581db1f85282" xlink:to="loc_us-gaap_StatementClassOfStockAxis_660504c8-3153-45fa-92e9-bee9fa68117c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_660504c8-3153-45fa-92e9-bee9fa68117c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_660504c8-3153-45fa-92e9-bee9fa68117c" xlink:to="loc_us-gaap_ClassOfStockDomain_660504c8-3153-45fa-92e9-bee9fa68117c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_de5cf88b-839c-493b-80e7-4e79cdd166cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_660504c8-3153-45fa-92e9-bee9fa68117c" xlink:to="loc_us-gaap_ClassOfStockDomain_de5cf88b-839c-493b-80e7-4e79cdd166cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_c104aa42-3263-4846-8489-61934d2886a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_de5cf88b-839c-493b-80e7-4e79cdd166cf" xlink:to="loc_us-gaap_CommonStockMember_c104aa42-3263-4846-8489-61934d2886a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_42e62359-1219-4055-b6a2-6fd081994a7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_de5cf88b-839c-493b-80e7-4e79cdd166cf" xlink:to="loc_us-gaap_WarrantMember_42e62359-1219-4055-b6a2-6fd081994a7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_ded07afd-f25d-4ea6-88e5-5e246c9995e5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_DocumentType_ded07afd-f25d-4ea6-88e5-5e246c9995e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_b1252c03-201f-4a46-835f-d71fec26e576" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_AmendmentFlag_b1252c03-201f-4a46-835f-d71fec26e576" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport_af7372af-c324-4317-a369-b2d349751c2c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAnnualReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_DocumentAnnualReport_af7372af-c324-4317-a369-b2d349751c2c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_d7d0ce3b-4f01-44b6-8f9c-b52f8da96838" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_DocumentPeriodEndDate_d7d0ce3b-4f01-44b6-8f9c-b52f8da96838" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_4657f8c5-8e73-42c2-bfbd-e0451580cb15" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_DocumentTransitionReport_4657f8c5-8e73-42c2-bfbd-e0451580cb15" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_d666b16a-eb7d-427b-8499-88d3ce4cad0c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityFileNumber_d666b16a-eb7d-427b-8499-88d3ce4cad0c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_c23f4a73-27dd-4048-829b-7a179b003166" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityRegistrantName_c23f4a73-27dd-4048-829b-7a179b003166" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_3fdc059c-19e0-464f-a010-6984bbb96e18" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityCentralIndexKey_3fdc059c-19e0-464f-a010-6984bbb96e18" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_334f747e-7477-4a14-84c5-c12360d15c2d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_CurrentFiscalYearEndDate_334f747e-7477-4a14-84c5-c12360d15c2d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_b0b93a55-8c19-400c-833d-91c0b9b27671" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_DocumentFiscalYearFocus_b0b93a55-8c19-400c-833d-91c0b9b27671" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_e082c5c7-9b49-4488-8e4a-c4be03d76eef" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_DocumentFiscalPeriodFocus_e082c5c7-9b49-4488-8e4a-c4be03d76eef" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_f76c5e9a-ec4e-432c-a441-110ff2043e76" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityIncorporationStateCountryCode_f76c5e9a-ec4e-432c-a441-110ff2043e76" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_89550de2-cf91-4cfc-a189-338b7ab501c0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityTaxIdentificationNumber_89550de2-cf91-4cfc-a189-338b7ab501c0" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_e8b648af-1974-4ff1-b9c8-c8d740fb4d99" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityAddressAddressLine1_e8b648af-1974-4ff1-b9c8-c8d740fb4d99" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_d0de37d9-200e-48f0-ad71-e7edbc1932ef" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityAddressCityOrTown_d0de37d9-200e-48f0-ad71-e7edbc1932ef" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_02574650-7902-4cd9-aeb0-1d184fcfa46f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityAddressStateOrProvince_02574650-7902-4cd9-aeb0-1d184fcfa46f" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_b35bb056-7f22-46ea-9bd5-79d9283c09f5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityAddressPostalZipCode_b35bb056-7f22-46ea-9bd5-79d9283c09f5" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_a742cf84-8e57-4c2a-a882-095c3d6ddacc" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_CityAreaCode_a742cf84-8e57-4c2a-a882-095c3d6ddacc" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_3d11eec3-9f2b-4118-b0d8-731cde2191ef" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_LocalPhoneNumber_3d11eec3-9f2b-4118-b0d8-731cde2191ef" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_1d8b6abe-c3b5-46c2-8066-57fdaf1fd65e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_Security12bTitle_1d8b6abe-c3b5-46c2-8066-57fdaf1fd65e" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_3ae66f83-6f92-448c-ace2-2e062d8a78d9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_TradingSymbol_3ae66f83-6f92-448c-ace2-2e062d8a78d9" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_a58c0920-d423-45d7-8ca6-a8e14da2a9ab" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_SecurityExchangeName_a58c0920-d423-45d7-8ca6-a8e14da2a9ab" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_4cfd9621-caae-400f-bfe3-1613f4ef396e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityWellKnownSeasonedIssuer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_4cfd9621-caae-400f-bfe3-1613f4ef396e" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityVoluntaryFilers_91d8bac8-62ca-406e-8d7b-5c812602948c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityVoluntaryFilers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityVoluntaryFilers_91d8bac8-62ca-406e-8d7b-5c812602948c" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_78ac55ca-148a-4ff8-a883-ef2e8e6a7d20" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityCurrentReportingStatus_78ac55ca-148a-4ff8-a883-ef2e8e6a7d20" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_9b3f133a-eb6c-49d1-89e3-fc882b946644" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityInteractiveDataCurrent_9b3f133a-eb6c-49d1-89e3-fc882b946644" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_19562cd3-8584-46b4-ba58-f77a072de828" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityFilerCategory_19562cd3-8584-46b4-ba58-f77a072de828" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_54c9140f-cafe-4ada-9ffb-4f3708703ef9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntitySmallBusiness_54c9140f-cafe-4ada-9ffb-4f3708703ef9" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_8622ab57-7d1c-4a13-9fb4-65899fa7058b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityEmergingGrowthCompany_8622ab57-7d1c-4a13-9fb4-65899fa7058b" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_IcfrAuditorAttestationFlag_670affe6-ba16-415e-a0b3-f7743a6fcb49" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_IcfrAuditorAttestationFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_IcfrAuditorAttestationFlag_670affe6-ba16-415e-a0b3-f7743a6fcb49" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFinStmtErrorCorrectionFlag_414fb40d-6100-40d0-a2dc-e70e3f41284b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFinStmtErrorCorrectionFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_DocumentFinStmtErrorCorrectionFlag_414fb40d-6100-40d0-a2dc-e70e3f41284b" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_1da93aa2-f14f-4d4c-ab2e-5e72a0a65bae" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityShellCompany_1da93aa2-f14f-4d4c-ab2e-5e72a0a65bae" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_4f386538-7b17-4a9f-baf2-cdd429530994" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_4f386538-7b17-4a9f-baf2-cdd429530994" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityPublicFloat_4659eabf-7077-4a53-83aa-d9bb0b731eeb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityPublicFloat"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_EntityPublicFloat_4659eabf-7077-4a53-83aa-d9bb0b731eeb" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentsIncorporatedByReferenceTextBlock_ad491eaf-d289-4d9a-ad6c-02c72d05cc0d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentsIncorporatedByReferenceTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_d0c56c8e-f635-4c2a-bd7e-23b61d5707af" xlink:to="loc_dei_DocumentsIncorporatedByReferenceTextBlock_ad491eaf-d289-4d9a-ad6c-02c72d05cc0d" xlink:type="arc" order="34"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/AuditInformation" xlink:type="simple" xlink:href="aal-20251231.xsd#AuditInformation"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/AuditInformation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorLineItems_e3d85bc1-1412-4f2f-9511-1fadc78dbf13" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorTable_1a94c718-d9c5-4ec6-9aa4-f95f96bac65c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_AuditorLineItems_e3d85bc1-1412-4f2f-9511-1fadc78dbf13" xlink:to="loc_dei_AuditorTable_1a94c718-d9c5-4ec6-9aa4-f95f96bac65c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_f2402100-bb20-4035-aa02-83880b8be5f7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_AuditorTable_1a94c718-d9c5-4ec6-9aa4-f95f96bac65c" xlink:to="loc_dei_LegalEntityAxis_f2402100-bb20-4035-aa02-83880b8be5f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_f2402100-bb20-4035-aa02-83880b8be5f7_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_f2402100-bb20-4035-aa02-83880b8be5f7" xlink:to="loc_dei_EntityDomain_f2402100-bb20-4035-aa02-83880b8be5f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_4ee229fc-e70a-4399-ba42-270de064cd28" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_f2402100-bb20-4035-aa02-83880b8be5f7" xlink:to="loc_dei_EntityDomain_4ee229fc-e70a-4399-ba42-270de064cd28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_336e55bf-1b76-496e-b2fb-64834d3e79f8" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4ee229fc-e70a-4399-ba42-270de064cd28" xlink:to="loc_aal_AmericanAirlinesIncMember_336e55bf-1b76-496e-b2fb-64834d3e79f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorName_85ca6fea-c957-4fbd-b8c1-08d1a78facc2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_AuditorLineItems_e3d85bc1-1412-4f2f-9511-1fadc78dbf13" xlink:to="loc_dei_AuditorName_85ca6fea-c957-4fbd-b8c1-08d1a78facc2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorLocation_0dd44a2c-60cd-4da4-a038-b78460c9f257" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorLocation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_AuditorLineItems_e3d85bc1-1412-4f2f-9511-1fadc78dbf13" xlink:to="loc_dei_AuditorLocation_0dd44a2c-60cd-4da4-a038-b78460c9f257" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorFirmId_11f74889-273e-485d-a0a7-ebcb454aaaf8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorFirmId"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_AuditorLineItems_e3d85bc1-1412-4f2f-9511-1fadc78dbf13" xlink:to="loc_dei_AuditorFirmId_11f74889-273e-485d-a0a7-ebcb454aaaf8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ConsolidatedStatementsofOperationsAmericanAirlinesGroupInc" xlink:type="simple" xlink:href="aal-20251231.xsd#ConsolidatedStatementsofOperationsAmericanAirlinesGroupInc"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ConsolidatedStatementsofOperationsAmericanAirlinesGroupInc" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_19633b4e-941b-47cd-965a-babb2f3fc448" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_113dad74-7986-44b0-b8ca-e87c1efcd8aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_19633b4e-941b-47cd-965a-babb2f3fc448" xlink:to="loc_us-gaap_StatementTable_113dad74-7986-44b0-b8ca-e87c1efcd8aa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_7e73e393-2580-40c0-a428-c3f4df71307c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_113dad74-7986-44b0-b8ca-e87c1efcd8aa" xlink:to="loc_srt_ProductOrServiceAxis_7e73e393-2580-40c0-a428-c3f4df71307c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7e73e393-2580-40c0-a428-c3f4df71307c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_7e73e393-2580-40c0-a428-c3f4df71307c" xlink:to="loc_srt_ProductsAndServicesDomain_7e73e393-2580-40c0-a428-c3f4df71307c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_cda83aba-d546-41c6-a778-572c81768b2e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_7e73e393-2580-40c0-a428-c3f4df71307c" xlink:to="loc_srt_ProductsAndServicesDomain_cda83aba-d546-41c6-a778-572c81768b2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PassengerMember_25cf21b0-3307-47c4-80b9-eba4ef34dda7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PassengerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_cda83aba-d546-41c6-a778-572c81768b2e" xlink:to="loc_us-gaap_PassengerMember_25cf21b0-3307-47c4-80b9-eba4ef34dda7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CargoAndFreightMember_9e8e4c9b-1ff9-4188-a858-e3d73fe9c3ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CargoAndFreightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_cda83aba-d546-41c6-a778-572c81768b2e" xlink:to="loc_us-gaap_CargoAndFreightMember_9e8e4c9b-1ff9-4188-a858-e3d73fe9c3ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductAndServiceOtherMember_0e3ba4bb-3501-4079-9f93-ac4fa3346ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProductAndServiceOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_cda83aba-d546-41c6-a778-572c81768b2e" xlink:to="loc_us-gaap_ProductAndServiceOtherMember_0e3ba4bb-3501-4079-9f93-ac4fa3346ff3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_e5566647-873f-4a6f-bd02-2545e75e89bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_19633b4e-941b-47cd-965a-babb2f3fc448" xlink:to="loc_us-gaap_RevenuesAbstract_e5566647-873f-4a6f-bd02-2545e75e89bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_a0f15848-ccf0-4b4e-8780-a00bc481fcff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_e5566647-873f-4a6f-bd02-2545e75e89bd" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_a0f15848-ccf0-4b4e-8780-a00bc481fcff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_19633b4e-941b-47cd-965a-babb2f3fc448" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FuelCosts_48e89dd1-2ac2-4162-b0f3-58c7914da651" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FuelCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:to="loc_us-gaap_FuelCosts_48e89dd1-2ac2-4162-b0f3-58c7914da651" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_42eb135c-9884-4087-8924-be465ee047ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:to="loc_us-gaap_LaborAndRelatedExpense_42eb135c-9884-4087-8924-be465ee047ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineCapacityPurchaseArrangements_c595129e-f4f6-428d-be5e-2647bfbd8e06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineCapacityPurchaseArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:to="loc_us-gaap_AirlineCapacityPurchaseArrangements_c595129e-f4f6-428d-be5e-2647bfbd8e06" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AircraftMaintenanceMaterialsAndRepairs_f7ec1810-1f28-4f69-a3d2-0e5670a5aea7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AircraftMaintenanceMaterialsAndRepairs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:to="loc_us-gaap_AircraftMaintenanceMaterialsAndRepairs_f7ec1810-1f28-4f69-a3d2-0e5670a5aea7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandingFeesAndOtherRentals_a475876c-deed-492a-bcca-5e71278f0475" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LandingFeesAndOtherRentals"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:to="loc_us-gaap_LandingFeesAndOtherRentals_a475876c-deed-492a-bcca-5e71278f0475" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AircraftRental_2678e757-d62f-4d05-a7d5-161c10241908" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AircraftRental"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:to="loc_us-gaap_AircraftRental_2678e757-d62f-4d05-a7d5-161c10241908" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_1f955867-d504-4b1c-ab3f-f1dc9c23b343" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:to="loc_us-gaap_SellingAndMarketingExpense_1f955867-d504-4b1c-ab3f-f1dc9c23b343" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_63dbf42c-391a-429f-b519-8f5f2f9d7fc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:to="loc_us-gaap_DepreciationAndAmortization_63dbf42c-391a-429f-b519-8f5f2f9d7fc8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RestructuringAndOtherExpenseIncomeMainline_492628f3-0d5f-4362-97de-c3e5322fc87a" xlink:href="aal-20251231.xsd#aal_RestructuringAndOtherExpenseIncomeMainline"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:to="loc_aal_RestructuringAndOtherExpenseIncomeMainline_492628f3-0d5f-4362-97de-c3e5322fc87a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_ff7d438c-482d-4846-a7d5-96575838728c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_ff7d438c-482d-4846-a7d5-96575838728c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_1a009110-6943-45c0-92d9-f4ff8c5c066f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_fe1dd57a-3cf0-43fb-b5f5-4501c08c5efa" xlink:to="loc_us-gaap_CostsAndExpenses_1a009110-6943-45c0-92d9-f4ff8c5c066f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_c011aa98-0b8e-42eb-a4e9-05c7911423f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_19633b4e-941b-47cd-965a-babb2f3fc448" xlink:to="loc_us-gaap_OperatingIncomeLoss_c011aa98-0b8e-42eb-a4e9-05c7911423f6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ecde5b4-45dd-4709-afb6-42172b3c8845" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_19633b4e-941b-47cd-965a-babb2f3fc448" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ecde5b4-45dd-4709-afb6-42172b3c8845" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_e58b23b8-7810-4dd6-81bb-50fcb04f69d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ecde5b4-45dd-4709-afb6-42172b3c8845" xlink:to="loc_us-gaap_InvestmentIncomeInterest_e58b23b8-7810-4dd6-81bb-50fcb04f69d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_4a3bc0a8-291e-4deb-93b4-28b908b58c48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ecde5b4-45dd-4709-afb6-42172b3c8845" xlink:to="loc_us-gaap_InterestExpenseNonoperating_4a3bc0a8-291e-4deb-93b4-28b908b58c48" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_c93b860a-a87f-4111-930c-c0eccecc3d47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ecde5b4-45dd-4709-afb6-42172b3c8845" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_c93b860a-a87f-4111-930c-c0eccecc3d47" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_0291a5ff-aafe-4693-82ee-43033756abff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ecde5b4-45dd-4709-afb6-42172b3c8845" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_0291a5ff-aafe-4693-82ee-43033756abff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_083988df-084e-4dd8-96d1-e04271361b1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_19633b4e-941b-47cd-965a-babb2f3fc448" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_083988df-084e-4dd8-96d1-e04271361b1f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_b389333b-8552-46c5-911e-423bf65cd570" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_19633b4e-941b-47cd-965a-babb2f3fc448" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_b389333b-8552-46c5-911e-423bf65cd570" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_304cac56-ad91-4557-9ce7-73b5496e64f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_19633b4e-941b-47cd-965a-babb2f3fc448" xlink:to="loc_us-gaap_NetIncomeLoss_304cac56-ad91-4557-9ce7-73b5496e64f9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_a52b962d-766a-44ea-815f-09f265aac0cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_19633b4e-941b-47cd-965a-babb2f3fc448" xlink:to="loc_us-gaap_EarningsPerShareAbstract_a52b962d-766a-44ea-815f-09f265aac0cc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_98af78b7-bdc5-4776-a692-e234edcc0bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_a52b962d-766a-44ea-815f-09f265aac0cc" xlink:to="loc_us-gaap_EarningsPerShareBasic_98af78b7-bdc5-4776-a692-e234edcc0bd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_856583cd-30e6-4658-828e-92d3b86c3bc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_a52b962d-766a-44ea-815f-09f265aac0cc" xlink:to="loc_us-gaap_EarningsPerShareDiluted_856583cd-30e6-4658-828e-92d3b86c3bc8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2c5fb1eb-3704-4bdd-b7d5-f4260d69e83c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_19633b4e-941b-47cd-965a-babb2f3fc448" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2c5fb1eb-3704-4bdd-b7d5-f4260d69e83c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_c7cc8b19-92f4-4ce4-a6ed-722f3c968279" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2c5fb1eb-3704-4bdd-b7d5-f4260d69e83c" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_c7cc8b19-92f4-4ce4-a6ed-722f3c968279" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_5e11cb31-c417-4a76-acfa-1d46b8df691b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2c5fb1eb-3704-4bdd-b7d5-f4260d69e83c" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_5e11cb31-c417-4a76-acfa-1d46b8df691b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ConsolidatedBalanceSheetsAmericanAirlinesGroupInc" xlink:type="simple" xlink:href="aal-20251231.xsd#ConsolidatedBalanceSheetsAmericanAirlinesGroupInc"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ConsolidatedBalanceSheetsAmericanAirlinesGroupInc" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_9da34da6-e8c7-4d04-848e-e13c70e325d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_330719e1-85b6-4d53-ae39-b978a019292a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_9da34da6-e8c7-4d04-848e-e13c70e325d5" xlink:to="loc_us-gaap_StatementTable_330719e1-85b6-4d53-ae39-b978a019292a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_5d596339-b25a-495e-8668-46f1e3b88a94" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_330719e1-85b6-4d53-ae39-b978a019292a" xlink:to="loc_srt_ProductOrServiceAxis_5d596339-b25a-495e-8668-46f1e3b88a94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_5d596339-b25a-495e-8668-46f1e3b88a94_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_5d596339-b25a-495e-8668-46f1e3b88a94" xlink:to="loc_srt_ProductsAndServicesDomain_5d596339-b25a-495e-8668-46f1e3b88a94_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_8ce06d93-e92e-47eb-b498-ec5a40b10aea" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_5d596339-b25a-495e-8668-46f1e3b88a94" xlink:to="loc_srt_ProductsAndServicesDomain_8ce06d93-e92e-47eb-b498-ec5a40b10aea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AirTrafficMember_28ce1705-7904-4d8d-b7f8-a582f4a5dcb0" xlink:href="aal-20251231.xsd#aal_AirTrafficMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_8ce06d93-e92e-47eb-b498-ec5a40b10aea" xlink:to="loc_aal_AirTrafficMember_28ce1705-7904-4d8d-b7f8-a582f4a5dcb0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LoyaltyProgramMember_aa9b6edb-2b3c-4d9a-8f4f-2b1f7959ff49" xlink:href="aal-20251231.xsd#aal_LoyaltyProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_8ce06d93-e92e-47eb-b498-ec5a40b10aea" xlink:to="loc_aal_LoyaltyProgramMember_aa9b6edb-2b3c-4d9a-8f4f-2b1f7959ff49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c6c68-e661-7449-bb58-d9e08122ce17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_330719e1-85b6-4d53-ae39-b978a019292a" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c6c68-e661-7449-bb58-d9e08122ce17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6c68-e661-7449-bb58-d9e08122ce17_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6c68-e661-7449-bb58-d9e08122ce17" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6c68-e661-7449-bb58-d9e08122ce17_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6c68-e661-7490-b727-fd1ad6da1c50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6c68-e661-7449-bb58-d9e08122ce17" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6c68-e661-7490-b727-fd1ad6da1c50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FuelFinancingArrangementMember_019c6c68-e661-758d-b23c-477eb5ab9380" xlink:href="aal-20251231.xsd#aal_FuelFinancingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c6c68-e661-7490-b727-fd1ad6da1c50" xlink:to="loc_aal_FuelFinancingArrangementMember_019c6c68-e661-758d-b23c-477eb5ab9380" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_54673472-8587-416b-b368-f46d25cf2592" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9da34da6-e8c7-4d04-848e-e13c70e325d5" xlink:to="loc_us-gaap_AssetsAbstract_54673472-8587-416b-b368-f46d25cf2592" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_ea8b29f1-5a68-4778-bfa8-1515d52b96c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_54673472-8587-416b-b368-f46d25cf2592" xlink:to="loc_us-gaap_AssetsCurrentAbstract_ea8b29f1-5a68-4778-bfa8-1515d52b96c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_f76aba51-ad9d-4b11-a5d2-64d4fed5fec6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Cash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_ea8b29f1-5a68-4778-bfa8-1515d52b96c4" xlink:to="loc_us-gaap_Cash_f76aba51-ad9d-4b11-a5d2-64d4fed5fec6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_9ef70d8c-6b77-49f8-9c44-9bae57241bf5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_ea8b29f1-5a68-4778-bfa8-1515d52b96c4" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_9ef70d8c-6b77-49f8-9c44-9bae57241bf5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndInvestmentsCurrent_3b33b1a8-3b58-41e8-9e85-b08d061b0102" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndInvestmentsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_ea8b29f1-5a68-4778-bfa8-1515d52b96c4" xlink:to="loc_us-gaap_RestrictedCashAndInvestmentsCurrent_3b33b1a8-3b58-41e8-9e85-b08d061b0102" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_67fc0e25-97b1-4871-9b8b-57acc7d53849" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_ea8b29f1-5a68-4778-bfa8-1515d52b96c4" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_67fc0e25-97b1-4871-9b8b-57acc7d53849" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineRelatedInventoryNet_81b56630-6d12-4d04-ac8b-9a4233bbe02f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineRelatedInventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_ea8b29f1-5a68-4778-bfa8-1515d52b96c4" xlink:to="loc_us-gaap_AirlineRelatedInventoryNet_81b56630-6d12-4d04-ac8b-9a4233bbe02f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_ac0f8ad0-6411-48c5-a638-73e11ae05b17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_ea8b29f1-5a68-4778-bfa8-1515d52b96c4" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_ac0f8ad0-6411-48c5-a638-73e11ae05b17" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_e64f73fe-55e3-4666-9048-7d642ded6ff9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_ea8b29f1-5a68-4778-bfa8-1515d52b96c4" xlink:to="loc_us-gaap_AssetsCurrent_e64f73fe-55e3-4666-9048-7d642ded6ff9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_29f7a90f-a8a5-47da-843f-08146c361793" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_54673472-8587-416b-b368-f46d25cf2592" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_29f7a90f-a8a5-47da-843f-08146c361793" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FlightEquipmentGross_7c701d1c-13f7-4f5a-9d5b-b12c75d4bf92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FlightEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_29f7a90f-a8a5-47da-843f-08146c361793" xlink:to="loc_us-gaap_FlightEquipmentGross_7c701d1c-13f7-4f5a-9d5b-b12c75d4bf92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_GroundPropertyAndEquipmentGross_ca3ff308-89aa-4e11-bde5-afb2be50f16f" xlink:href="aal-20251231.xsd#aal_GroundPropertyAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_29f7a90f-a8a5-47da-843f-08146c361793" xlink:to="loc_aal_GroundPropertyAndEquipmentGross_ca3ff308-89aa-4e11-bde5-afb2be50f16f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepositsOnFlightEquipment_6f509eb4-f2d1-4e8e-85f4-9889fe4b060a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepositsOnFlightEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_29f7a90f-a8a5-47da-843f-08146c361793" xlink:to="loc_us-gaap_DepositsOnFlightEquipment_6f509eb4-f2d1-4e8e-85f4-9889fe4b060a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_a43f601f-9c76-4a81-b1bc-d6f4e29a1227" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_29f7a90f-a8a5-47da-843f-08146c361793" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_a43f601f-9c76-4a81-b1bc-d6f4e29a1227" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_c5a6abb4-4753-4583-9131-74b1813338c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_29f7a90f-a8a5-47da-843f-08146c361793" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_c5a6abb4-4753-4583-9131-74b1813338c9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_8159bb4d-4ae2-4363-a3c8-4c513595807c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_29f7a90f-a8a5-47da-843f-08146c361793" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_8159bb4d-4ae2-4363-a3c8-4c513595807c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_d6689a92-8c69-4042-bc15-7ef5137b407e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_54673472-8587-416b-b368-f46d25cf2592" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_d6689a92-8c69-4042-bc15-7ef5137b407e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrentAbstract_666a1cc9-cc4a-497b-ab92-30747599f217" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_54673472-8587-416b-b368-f46d25cf2592" xlink:to="loc_us-gaap_OtherAssetsNoncurrentAbstract_666a1cc9-cc4a-497b-ab92-30747599f217" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_2d4729d1-209c-4d73-93f4-f778212e5b4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_666a1cc9-cc4a-497b-ab92-30747599f217" xlink:to="loc_us-gaap_Goodwill_2d4729d1-209c-4d73-93f4-f778212e5b4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8f177467-08d0-4ab5-8134-7d0be888a973" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_666a1cc9-cc4a-497b-ab92-30747599f217" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8f177467-08d0-4ab5-8134-7d0be888a973" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_4ef5920a-8723-4835-8f30-42ee1b163e78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_666a1cc9-cc4a-497b-ab92-30747599f217" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_4ef5920a-8723-4835-8f30-42ee1b163e78" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_4d5093df-6479-4e62-899f-b8336eb932d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_666a1cc9-cc4a-497b-ab92-30747599f217" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_4d5093df-6479-4e62-899f-b8336eb932d7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_35fa2377-bac1-4f22-8e3b-ece7da0f45ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_666a1cc9-cc4a-497b-ab92-30747599f217" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_35fa2377-bac1-4f22-8e3b-ece7da0f45ce" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_11cebfc3-03ce-49aa-9ccc-7a26c376ac29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_54673472-8587-416b-b368-f46d25cf2592" xlink:to="loc_us-gaap_Assets_11cebfc3-03ce-49aa-9ccc-7a26c376ac29" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_14d61692-6c02-4df6-8300-49aab1732537" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9da34da6-e8c7-4d04-848e-e13c70e325d5" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_14d61692-6c02-4df6-8300-49aab1732537" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_c73664c1-7158-4f90-9a3e-77d0ce2b09cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_14d61692-6c02-4df6-8300-49aab1732537" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_c73664c1-7158-4f90-9a3e-77d0ce2b09cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_81f28548-1999-4edb-a125-e3259c43b0ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_c73664c1-7158-4f90-9a3e-77d0ce2b09cb" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_81f28548-1999-4edb-a125-e3259c43b0ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_3b2236e6-50e4-4e23-bd88-efbda56c7918" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_c73664c1-7158-4f90-9a3e-77d0ce2b09cb" xlink:to="loc_us-gaap_AccountsPayableCurrent_3b2236e6-50e4-4e23-bd88-efbda56c7918" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_e21d32a5-a5e5-4746-8fab-65190d11bb76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_c73664c1-7158-4f90-9a3e-77d0ce2b09cb" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_e21d32a5-a5e5-4746-8fab-65190d11bb76" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_936ebf98-6be7-4d28-b2e9-2957154765d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_c73664c1-7158-4f90-9a3e-77d0ce2b09cb" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_936ebf98-6be7-4d28-b2e9-2957154765d6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_33e0356c-56b4-46d6-852a-7f77a77d53e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_c73664c1-7158-4f90-9a3e-77d0ce2b09cb" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_33e0356c-56b4-46d6-852a-7f77a77d53e7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBankLoansAndNotesPayable_019ba494-6821-7187-a6d6-8580b4b327df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBankLoansAndNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_c73664c1-7158-4f90-9a3e-77d0ce2b09cb" xlink:to="loc_us-gaap_ShortTermBankLoansAndNotesPayable_019ba494-6821-7187-a6d6-8580b4b327df" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fc975d78-6059-4c1a-bcd1-a5fc6e8e99a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_c73664c1-7158-4f90-9a3e-77d0ce2b09cb" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fc975d78-6059-4c1a-bcd1-a5fc6e8e99a6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_b6aad015-9619-401d-8f03-2d479186aa2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_c73664c1-7158-4f90-9a3e-77d0ce2b09cb" xlink:to="loc_us-gaap_LiabilitiesCurrent_b6aad015-9619-401d-8f03-2d479186aa2f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_12f1310d-09d6-453d-bac7-1e00252591ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_14d61692-6c02-4df6-8300-49aab1732537" xlink:to="loc_us-gaap_LiabilitiesNoncurrentAbstract_12f1310d-09d6-453d-bac7-1e00252591ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_537fdba1-14e2-40d8-811d-4ddf304635f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_12f1310d-09d6-453d-bac7-1e00252591ae" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_537fdba1-14e2-40d8-811d-4ddf304635f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_8a295702-8167-48bd-ad29-cda1e9900dd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_12f1310d-09d6-453d-bac7-1e00252591ae" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_8a295702-8167-48bd-ad29-cda1e9900dd5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_0c230a54-1b13-4883-a33f-014164f1511d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_12f1310d-09d6-453d-bac7-1e00252591ae" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_0c230a54-1b13-4883-a33f-014164f1511d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_1c3fbd9a-d6d1-434f-b854-16dff3e2a329" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_12f1310d-09d6-453d-bac7-1e00252591ae" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_1c3fbd9a-d6d1-434f-b854-16dff3e2a329" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_a79ced29-9bed-4f7a-a73b-2b738e4665a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_12f1310d-09d6-453d-bac7-1e00252591ae" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_a79ced29-9bed-4f7a-a73b-2b738e4665a5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_0039de3a-8e29-4cef-b843-a7cd14d8228f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_12f1310d-09d6-453d-bac7-1e00252591ae" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_0039de3a-8e29-4cef-b843-a7cd14d8228f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_02d727b3-22f5-4a40-b5a6-1c7738223752" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_14d61692-6c02-4df6-8300-49aab1732537" xlink:to="loc_us-gaap_CommitmentsAndContingencies_02d727b3-22f5-4a40-b5a6-1c7738223752" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_5572c859-8199-401e-8b73-c9e677cd7e08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_14d61692-6c02-4df6-8300-49aab1732537" xlink:to="loc_us-gaap_StockholdersEquityAbstract_5572c859-8199-401e-8b73-c9e677cd7e08" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_4527ae27-e1c2-41ff-a3ea-268fe288ba34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5572c859-8199-401e-8b73-c9e677cd7e08" xlink:to="loc_us-gaap_CommonStockValue_4527ae27-e1c2-41ff-a3ea-268fe288ba34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_ad7bb456-61fa-418f-9b13-8cf1da5f0ec6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5572c859-8199-401e-8b73-c9e677cd7e08" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_ad7bb456-61fa-418f-9b13-8cf1da5f0ec6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_47e1e4f8-5a5c-4740-a883-942c3f97cf6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5572c859-8199-401e-8b73-c9e677cd7e08" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_47e1e4f8-5a5c-4740-a883-942c3f97cf6c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_f039c5d1-a20f-4107-bb47-f8baae2e1c1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5572c859-8199-401e-8b73-c9e677cd7e08" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_f039c5d1-a20f-4107-bb47-f8baae2e1c1e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_46e688cc-5779-4f5e-8a59-dee3b1c3dc26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5572c859-8199-401e-8b73-c9e677cd7e08" xlink:to="loc_us-gaap_StockholdersEquity_46e688cc-5779-4f5e-8a59-dee3b1c3dc26" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_3e44ad2c-13e5-40fc-8f99-55430b558768" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_14d61692-6c02-4df6-8300-49aab1732537" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_3e44ad2c-13e5-40fc-8f99-55430b558768" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ConsolidatedStatementsofCashFlowsAmericanAirlinesGroupInc" xlink:type="simple" xlink:href="aal-20251231.xsd#ConsolidatedStatementsofCashFlowsAmericanAirlinesGroupInc"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ConsolidatedStatementsofCashFlowsAmericanAirlinesGroupInc" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_f8aaf15e-c22a-413c-a229-154eaa4a8521" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_96b9eb68-e9f8-4be4-b6fd-2ef4d90533f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_f8aaf15e-c22a-413c-a229-154eaa4a8521" xlink:to="loc_us-gaap_StatementTable_96b9eb68-e9f8-4be4-b6fd-2ef4d90533f1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_b55ddeab-8402-41f2-81b9-ca584f16567a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_96b9eb68-e9f8-4be4-b6fd-2ef4d90533f1" xlink:to="loc_srt_ProductOrServiceAxis_b55ddeab-8402-41f2-81b9-ca584f16567a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_b55ddeab-8402-41f2-81b9-ca584f16567a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_b55ddeab-8402-41f2-81b9-ca584f16567a" xlink:to="loc_srt_ProductsAndServicesDomain_b55ddeab-8402-41f2-81b9-ca584f16567a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_c775b443-0095-43a6-b167-eaea2b6f5339" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_b55ddeab-8402-41f2-81b9-ca584f16567a" xlink:to="loc_srt_ProductsAndServicesDomain_c775b443-0095-43a6-b167-eaea2b6f5339" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AirTrafficMember_bdd74abc-03d5-49f5-8a83-679c9d132a1a" xlink:href="aal-20251231.xsd#aal_AirTrafficMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c775b443-0095-43a6-b167-eaea2b6f5339" xlink:to="loc_aal_AirTrafficMember_bdd74abc-03d5-49f5-8a83-679c9d132a1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LoyaltyProgramMember_5eeab4c2-c209-49f7-86f5-ebb7019c3430" xlink:href="aal-20251231.xsd#aal_LoyaltyProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c775b443-0095-43a6-b167-eaea2b6f5339" xlink:to="loc_aal_LoyaltyProgramMember_5eeab4c2-c209-49f7-86f5-ebb7019c3430" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c6c67-1c56-786b-8e98-5bc09c771181" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_96b9eb68-e9f8-4be4-b6fd-2ef4d90533f1" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c6c67-1c56-786b-8e98-5bc09c771181" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6c67-1c56-786b-8e98-5bc09c771181_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6c67-1c56-786b-8e98-5bc09c771181" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6c67-1c56-786b-8e98-5bc09c771181_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6c67-1c56-7d53-af18-0ce5010b33ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6c67-1c56-786b-8e98-5bc09c771181" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6c67-1c56-7d53-af18-0ce5010b33ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FuelFinancingArrangementMember_019c6c67-47ba-780f-8a12-5b009bf7ff79" xlink:href="aal-20251231.xsd#aal_FuelFinancingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c6c67-1c56-7d53-af18-0ce5010b33ce" xlink:to="loc_aal_FuelFinancingArrangementMember_019c6c67-47ba-780f-8a12-5b009bf7ff79" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_7d34a9de-f78c-4737-9795-57269a1a764e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f8aaf15e-c22a-413c-a229-154eaa4a8521" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_7d34a9de-f78c-4737-9795-57269a1a764e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_7308258a-2e2e-44c1-b2bc-e171211d7403" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_7d34a9de-f78c-4737-9795-57269a1a764e" xlink:to="loc_us-gaap_NetIncomeLoss_7308258a-2e2e-44c1-b2bc-e171211d7403" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42cd2323-3b87-4ef1-99b5-e77242ece0d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_7d34a9de-f78c-4737-9795-57269a1a764e" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42cd2323-3b87-4ef1-99b5-e77242ece0d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_MainlineAndExpressDepreciationAndAmortization_dd730957-2cae-4091-9a54-1bb34b1132a3" xlink:href="aal-20251231.xsd#aal_MainlineAndExpressDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42cd2323-3b87-4ef1-99b5-e77242ece0d5" xlink:to="loc_aal_MainlineAndExpressDepreciationAndAmortization_dd730957-2cae-4091-9a54-1bb34b1132a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_f2020531-124b-4b7d-a1ed-4112fca69659" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42cd2323-3b87-4ef1-99b5-e77242ece0d5" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_f2020531-124b-4b7d-a1ed-4112fca69659" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SpecialChargesNonCash_65d37a91-5280-47e7-b341-4715e86f1fb1" xlink:href="aal-20251231.xsd#aal_SpecialChargesNonCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42cd2323-3b87-4ef1-99b5-e77242ece0d5" xlink:to="loc_aal_SpecialChargesNonCash_65d37a91-5280-47e7-b341-4715e86f1fb1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash_e74ad0df-9485-425f-a2bf-4c4d2977f76f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42cd2323-3b87-4ef1-99b5-e77242ece0d5" xlink:to="loc_us-gaap_PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash_e74ad0df-9485-425f-a2bf-4c4d2977f76f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_0fb6bd82-6d92-4e41-93fc-bc0d08a7cac9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42cd2323-3b87-4ef1-99b5-e77242ece0d5" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_0fb6bd82-6d92-4e41-93fc-bc0d08a7cac9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_8be5b0c4-02c7-484e-a729-1d888fc78022" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42cd2323-3b87-4ef1-99b5-e77242ece0d5" xlink:to="loc_us-gaap_ShareBasedCompensation_8be5b0c4-02c7-484e-a729-1d888fc78022" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_93ab9297-8f16-4fae-9a8c-f03392a41534" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42cd2323-3b87-4ef1-99b5-e77242ece0d5" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_93ab9297-8f16-4fae-9a8c-f03392a41534" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_50bb79e6-457e-4ade-983f-fe016458a8f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_7d34a9de-f78c-4737-9795-57269a1a764e" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_50bb79e6-457e-4ade-983f-fe016458a8f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_5495ec71-44d2-41c6-a22d-3d977e268413" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_50bb79e6-457e-4ade-983f-fe016458a8f6" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_5495ec71-44d2-41c6-a22d-3d977e268413" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_c75c5584-db43-4dda-8a7d-316e0696aa21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_50bb79e6-457e-4ade-983f-fe016458a8f6" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_c75c5584-db43-4dda-8a7d-316e0696aa21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_46b723be-e406-4386-be45-86aa5e46c8fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_50bb79e6-457e-4ade-983f-fe016458a8f6" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_46b723be-e406-4386-be45-86aa5e46c8fc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_3aa3a2aa-0c8d-4b34-b924-06b42544afe9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_50bb79e6-457e-4ade-983f-fe016458a8f6" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_3aa3a2aa-0c8d-4b34-b924-06b42544afe9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPensionPlanObligations_b99cc93a-62b1-40d7-a9ea-6cebbcb1b7e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInPensionPlanObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_50bb79e6-457e-4ade-983f-fe016458a8f6" xlink:to="loc_us-gaap_IncreaseDecreaseInPensionPlanObligations_b99cc93a-62b1-40d7-a9ea-6cebbcb1b7e5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_3524dd45-ab35-4126-b559-eb98ce99e704" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_50bb79e6-457e-4ade-983f-fe016458a8f6" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_3524dd45-ab35-4126-b559-eb98ce99e704" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_93caa0cc-8281-464d-8fb5-84afe9df3d16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_7d34a9de-f78c-4737-9795-57269a1a764e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_93caa0cc-8281-464d-8fb5-84afe9df3d16" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4741f9da-b9c4-47cc-bc71-4f6cc9f14158" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f8aaf15e-c22a-413c-a229-154eaa4a8521" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4741f9da-b9c4-47cc-bc71-4f6cc9f14158" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_e7c4ffaa-9fdd-461f-859d-638cbae3d637" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4741f9da-b9c4-47cc-bc71-4f6cc9f14158" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_e7c4ffaa-9fdd-461f-859d-638cbae3d637" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ProceedsFromSaleOfPropertyPlantAndEquipmentAndSaleLeasebackTransactions_ae0b7a46-2e0a-4ebd-8731-e9e1e4f3b9c3" xlink:href="aal-20251231.xsd#aal_ProceedsFromSaleOfPropertyPlantAndEquipmentAndSaleLeasebackTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4741f9da-b9c4-47cc-bc71-4f6cc9f14158" xlink:to="loc_aal_ProceedsFromSaleOfPropertyPlantAndEquipmentAndSaleLeasebackTransactions_ae0b7a46-2e0a-4ebd-8731-e9e1e4f3b9c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfShortTermInvestments_9e32e044-8922-432d-99f5-f49381e5aa0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4741f9da-b9c4-47cc-bc71-4f6cc9f14158" xlink:to="loc_us-gaap_ProceedsFromSaleOfShortTermInvestments_9e32e044-8922-432d-99f5-f49381e5aa0c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_65e1c7f8-3f23-4064-854d-c83e34a9ae56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4741f9da-b9c4-47cc-bc71-4f6cc9f14158" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_65e1c7f8-3f23-4064-854d-c83e34a9ae56" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseOfRestrictedInvestments_eac9e035-e702-4421-9140-478164155846" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseOfRestrictedInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4741f9da-b9c4-47cc-bc71-4f6cc9f14158" xlink:to="loc_us-gaap_IncreaseDecreaseOfRestrictedInvestments_eac9e035-e702-4421-9140-478164155846" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_6699553f-c401-4371-ace8-60f9ca3c3bfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4741f9da-b9c4-47cc-bc71-4f6cc9f14158" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_6699553f-c401-4371-ace8-60f9ca3c3bfa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_eaa48743-f93d-42a3-b171-524f58627d12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4741f9da-b9c4-47cc-bc71-4f6cc9f14158" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_eaa48743-f93d-42a3-b171-524f58627d12" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6e536fca-56b8-4405-9c8b-498f93facdfd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f8aaf15e-c22a-413c-a229-154eaa4a8521" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6e536fca-56b8-4405-9c8b-498f93facdfd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations_83699949-255c-4734-a6f7-9e311bc5635b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6e536fca-56b8-4405-9c8b-498f93facdfd" xlink:to="loc_us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations_83699949-255c-4734-a6f7-9e311bc5635b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_86c192fd-f751-4e35-b6b7-5bb1ba974428" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6e536fca-56b8-4405-9c8b-498f93facdfd" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_86c192fd-f751-4e35-b6b7-5bb1ba974428" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_NetProceedsFromShortTermLoansAndNotesPayable_019c2a5f-3f3e-74f7-b8b5-a63d4322d8f4" xlink:href="aal-20251231.xsd#aal_NetProceedsFromShortTermLoansAndNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6e536fca-56b8-4405-9c8b-498f93facdfd" xlink:to="loc_aal_NetProceedsFromShortTermLoansAndNotesPayable_019c2a5f-3f3e-74f7-b8b5-a63d4322d8f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_566e3901-31cb-4b08-97a8-87173160cdb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6e536fca-56b8-4405-9c8b-498f93facdfd" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_566e3901-31cb-4b08-97a8-87173160cdb9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_2e22e088-60e8-45ce-bdee-b45a237386c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6e536fca-56b8-4405-9c8b-498f93facdfd" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_2e22e088-60e8-45ce-bdee-b45a237386c9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_1bee3a06-a808-4367-9725-787de285cf11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f8aaf15e-c22a-413c-a229-154eaa4a8521" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_1bee3a06-a808-4367-9725-787de285cf11" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_6ba3273e-8048-440c-9000-b2d33b0d19a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f8aaf15e-c22a-413c-a229-154eaa4a8521" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_6ba3273e-8048-440c-9000-b2d33b0d19a5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9b2c342a-1bca-458d-8540-a710192148c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ConsolidatedStatementsofStockholdersDeficitAmericanAirlinesGroupInc" xlink:type="simple" xlink:href="aal-20251231.xsd#ConsolidatedStatementsofStockholdersDeficitAmericanAirlinesGroupInc"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ConsolidatedStatementsofStockholdersDeficitAmericanAirlinesGroupInc" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_75ef8d5c-f10c-424a-853c-b02aa9826394" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_58dc948f-d82d-48da-ba90-5c52c10cf3dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_75ef8d5c-f10c-424a-853c-b02aa9826394" xlink:to="loc_us-gaap_StatementTable_58dc948f-d82d-48da-ba90-5c52c10cf3dc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_802908b9-36dd-4eef-9e60-15e84d40bd90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_58dc948f-d82d-48da-ba90-5c52c10cf3dc" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_802908b9-36dd-4eef-9e60-15e84d40bd90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_802908b9-36dd-4eef-9e60-15e84d40bd90_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_802908b9-36dd-4eef-9e60-15e84d40bd90" xlink:to="loc_us-gaap_EquityComponentDomain_802908b9-36dd-4eef-9e60-15e84d40bd90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_7c761fc9-ddae-4d49-8844-9ae56e2220e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_802908b9-36dd-4eef-9e60-15e84d40bd90" xlink:to="loc_us-gaap_EquityComponentDomain_7c761fc9-ddae-4d49-8844-9ae56e2220e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_03a82442-e43a-4adb-83e3-f667d6ac0a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_7c761fc9-ddae-4d49-8844-9ae56e2220e5" xlink:to="loc_us-gaap_CommonStockMember_03a82442-e43a-4adb-83e3-f667d6ac0a8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_b6971e8e-e2f6-4f95-a2ca-8b74966fe804" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_7c761fc9-ddae-4d49-8844-9ae56e2220e5" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_b6971e8e-e2f6-4f95-a2ca-8b74966fe804" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8f2b9a04-9848-4e90-b264-873ae4af79e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_7c761fc9-ddae-4d49-8844-9ae56e2220e5" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8f2b9a04-9848-4e90-b264-873ae4af79e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_145ce0f0-f40c-484f-aacd-68d8a09f9779" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_7c761fc9-ddae-4d49-8844-9ae56e2220e5" xlink:to="loc_us-gaap_RetainedEarningsMember_145ce0f0-f40c-484f-aacd-68d8a09f9779" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_73b181d5-8229-4080-b125-853f6fd4e5ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_75ef8d5c-f10c-424a-853c-b02aa9826394" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_73b181d5-8229-4080-b125-853f6fd4e5ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_c0384d8b-fd56-44a9-b611-d82e948e33a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_73b181d5-8229-4080-b125-853f6fd4e5ba" xlink:to="loc_us-gaap_StockholdersEquity_c0384d8b-fd56-44a9-b611-d82e948e33a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_664fca67-aa54-44d1-a847-b94d807aa334" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_73b181d5-8229-4080-b125-853f6fd4e5ba" xlink:to="loc_us-gaap_NetIncomeLoss_664fca67-aa54-44d1-a847-b94d807aa334" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_ead6203e-be44-4da1-b1b8-79830a266b4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_73b181d5-8229-4080-b125-853f6fd4e5ba" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_ead6203e-be44-4da1-b1b8-79830a266b4c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AdjustmentsToAdditionalPaidInCapitalWarrantSettlement_019ba499-c781-729e-9a53-ec22232a2d6a" xlink:href="aal-20251231.xsd#aal_AdjustmentsToAdditionalPaidInCapitalWarrantSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_73b181d5-8229-4080-b125-853f6fd4e5ba" xlink:to="loc_aal_AdjustmentsToAdditionalPaidInCapitalWarrantSettlement_019ba499-c781-729e-9a53-ec22232a2d6a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_565c4140-7bd6-492c-b2c0-6757e5815206" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_73b181d5-8229-4080-b125-853f6fd4e5ba" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_565c4140-7bd6-492c-b2c0-6757e5815206" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_e37373f0-394e-4354-aa75-1e0f6f9fb90f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_73b181d5-8229-4080-b125-853f6fd4e5ba" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_e37373f0-394e-4354-aa75-1e0f6f9fb90f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AdjustmentsToAdditionalPaidInCapitalSettlementOfSingleDipUnsecuredClaimsAndRetirementOfCommonStock_cb82e931-b2c0-4218-8720-db10bbb24679" xlink:href="aal-20251231.xsd#aal_AdjustmentsToAdditionalPaidInCapitalSettlementOfSingleDipUnsecuredClaimsAndRetirementOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_73b181d5-8229-4080-b125-853f6fd4e5ba" xlink:to="loc_aal_AdjustmentsToAdditionalPaidInCapitalSettlementOfSingleDipUnsecuredClaimsAndRetirementOfCommonStock_cb82e931-b2c0-4218-8720-db10bbb24679" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AdjustmentsToAdditionalPaidInCapitalModificationOfShareBasedAwards_0335250f-b531-4e46-9385-0ed163d7dea9" xlink:href="aal-20251231.xsd#aal_AdjustmentsToAdditionalPaidInCapitalModificationOfShareBasedAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_73b181d5-8229-4080-b125-853f6fd4e5ba" xlink:to="loc_aal_AdjustmentsToAdditionalPaidInCapitalModificationOfShareBasedAwards_0335250f-b531-4e46-9385-0ed163d7dea9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_821b5765-dc1b-4c82-847a-e98f42e49c26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ConsolidatedStatementsofOperationsAmericanAirlinesInc" xlink:type="simple" xlink:href="aal-20251231.xsd#ConsolidatedStatementsofOperationsAmericanAirlinesInc"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ConsolidatedStatementsofOperationsAmericanAirlinesInc" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_003afae7-a686-42af-9605-ba6fc31be776" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_8a8290b6-c826-4c8a-808b-6f2626844056" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_003afae7-a686-42af-9605-ba6fc31be776" xlink:to="loc_us-gaap_StatementTable_8a8290b6-c826-4c8a-808b-6f2626844056" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_ef87eaab-12d9-4399-8f45-dc389faa96a0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8a8290b6-c826-4c8a-808b-6f2626844056" xlink:to="loc_dei_LegalEntityAxis_ef87eaab-12d9-4399-8f45-dc389faa96a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ef87eaab-12d9-4399-8f45-dc389faa96a0_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_ef87eaab-12d9-4399-8f45-dc389faa96a0" xlink:to="loc_dei_EntityDomain_ef87eaab-12d9-4399-8f45-dc389faa96a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_546537ce-040d-4da8-982a-a0f8b9d9a787" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_ef87eaab-12d9-4399-8f45-dc389faa96a0" xlink:to="loc_dei_EntityDomain_546537ce-040d-4da8-982a-a0f8b9d9a787" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_290abb30-87b9-4034-8b2a-d1d5166e1309" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_546537ce-040d-4da8-982a-a0f8b9d9a787" xlink:to="loc_aal_AmericanAirlinesIncMember_290abb30-87b9-4034-8b2a-d1d5166e1309" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_ea5f213e-f8c6-484e-8376-2c90b2edc650" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8a8290b6-c826-4c8a-808b-6f2626844056" xlink:to="loc_srt_ProductOrServiceAxis_ea5f213e-f8c6-484e-8376-2c90b2edc650" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_ea5f213e-f8c6-484e-8376-2c90b2edc650_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_ea5f213e-f8c6-484e-8376-2c90b2edc650" xlink:to="loc_srt_ProductsAndServicesDomain_ea5f213e-f8c6-484e-8376-2c90b2edc650_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_28eb6d65-99cf-4655-b90b-bbb6f4837201" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_ea5f213e-f8c6-484e-8376-2c90b2edc650" xlink:to="loc_srt_ProductsAndServicesDomain_28eb6d65-99cf-4655-b90b-bbb6f4837201" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PassengerMember_0c1d420f-9138-45e5-9022-aea8599c44bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PassengerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_28eb6d65-99cf-4655-b90b-bbb6f4837201" xlink:to="loc_us-gaap_PassengerMember_0c1d420f-9138-45e5-9022-aea8599c44bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CargoAndFreightMember_9ca24931-42ce-4f7c-8cd4-13a169112e6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CargoAndFreightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_28eb6d65-99cf-4655-b90b-bbb6f4837201" xlink:to="loc_us-gaap_CargoAndFreightMember_9ca24931-42ce-4f7c-8cd4-13a169112e6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductAndServiceOtherMember_68fcd774-1956-4596-8d7e-2745239e554c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProductAndServiceOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_28eb6d65-99cf-4655-b90b-bbb6f4837201" xlink:to="loc_us-gaap_ProductAndServiceOtherMember_68fcd774-1956-4596-8d7e-2745239e554c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_9378babe-ac96-438e-899b-d50de50bc380" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_003afae7-a686-42af-9605-ba6fc31be776" xlink:to="loc_us-gaap_RevenuesAbstract_9378babe-ac96-438e-899b-d50de50bc380" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_81543808-8c94-4ed6-91f5-2c0d02bbc773" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_9378babe-ac96-438e-899b-d50de50bc380" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_81543808-8c94-4ed6-91f5-2c0d02bbc773" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_003afae7-a686-42af-9605-ba6fc31be776" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FuelCosts_f5223a4d-39fb-49cc-b18e-770416beb801" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FuelCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:to="loc_us-gaap_FuelCosts_f5223a4d-39fb-49cc-b18e-770416beb801" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_fd2cadcc-a543-47dd-8439-9c5e306cc8cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:to="loc_us-gaap_LaborAndRelatedExpense_fd2cadcc-a543-47dd-8439-9c5e306cc8cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineCapacityPurchaseArrangements_15770004-3319-4fa7-b005-852a0be0b489" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineCapacityPurchaseArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:to="loc_us-gaap_AirlineCapacityPurchaseArrangements_15770004-3319-4fa7-b005-852a0be0b489" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AircraftMaintenanceMaterialsAndRepairs_9ae63a2c-ea7e-4458-8bc7-eefa2be6048b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AircraftMaintenanceMaterialsAndRepairs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:to="loc_us-gaap_AircraftMaintenanceMaterialsAndRepairs_9ae63a2c-ea7e-4458-8bc7-eefa2be6048b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandingFeesAndOtherRentals_3be553ee-3720-4948-9f5e-af306a21b96f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LandingFeesAndOtherRentals"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:to="loc_us-gaap_LandingFeesAndOtherRentals_3be553ee-3720-4948-9f5e-af306a21b96f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AircraftRental_89308817-1a67-4e03-aba3-c89040247383" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AircraftRental"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:to="loc_us-gaap_AircraftRental_89308817-1a67-4e03-aba3-c89040247383" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_0513b65c-68de-46b1-9c50-f3c6d57d51dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:to="loc_us-gaap_SellingAndMarketingExpense_0513b65c-68de-46b1-9c50-f3c6d57d51dc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_21616dc4-12a7-44b5-95ff-0aa0ef74b076" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:to="loc_us-gaap_DepreciationAndAmortization_21616dc4-12a7-44b5-95ff-0aa0ef74b076" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RestructuringAndOtherExpenseIncomeMainline_b8660cda-48b9-4c17-8c97-245eb57dc4dd" xlink:href="aal-20251231.xsd#aal_RestructuringAndOtherExpenseIncomeMainline"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:to="loc_aal_RestructuringAndOtherExpenseIncomeMainline_b8660cda-48b9-4c17-8c97-245eb57dc4dd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_b3fce432-fc2a-45af-9396-957207ec220c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_b3fce432-fc2a-45af-9396-957207ec220c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_4e9751d8-2d3b-4e4b-8d45-fc63e9267278" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e2dd770b-1e58-44f4-a2fa-7915582c7138" xlink:to="loc_us-gaap_CostsAndExpenses_4e9751d8-2d3b-4e4b-8d45-fc63e9267278" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_8c50d100-bf31-4f82-8e50-ef03f197bbcd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_003afae7-a686-42af-9605-ba6fc31be776" xlink:to="loc_us-gaap_OperatingIncomeLoss_8c50d100-bf31-4f82-8e50-ef03f197bbcd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ca04d43-0f53-4f8e-ae9d-5fa3eea96f31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_003afae7-a686-42af-9605-ba6fc31be776" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ca04d43-0f53-4f8e-ae9d-5fa3eea96f31" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_a4d3a839-eaa2-40cb-ae38-161f6cee125f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ca04d43-0f53-4f8e-ae9d-5fa3eea96f31" xlink:to="loc_us-gaap_InvestmentIncomeInterest_a4d3a839-eaa2-40cb-ae38-161f6cee125f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_df01f69e-e39b-4e5f-a517-0adab7598057" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ca04d43-0f53-4f8e-ae9d-5fa3eea96f31" xlink:to="loc_us-gaap_InterestExpenseNonoperating_df01f69e-e39b-4e5f-a517-0adab7598057" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_c0cfe194-cd43-4d77-a006-d1dd3fc43896" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ca04d43-0f53-4f8e-ae9d-5fa3eea96f31" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_c0cfe194-cd43-4d77-a006-d1dd3fc43896" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_138a965d-700d-44e2-b8fe-63d51c505be8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7ca04d43-0f53-4f8e-ae9d-5fa3eea96f31" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_138a965d-700d-44e2-b8fe-63d51c505be8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_73dc9e55-3535-46f4-8748-0ba2302241a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_003afae7-a686-42af-9605-ba6fc31be776" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_73dc9e55-3535-46f4-8748-0ba2302241a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_f667875d-e006-4f0d-b4f9-0b83f10a1496" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_003afae7-a686-42af-9605-ba6fc31be776" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_f667875d-e006-4f0d-b4f9-0b83f10a1496" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_6171f389-f30d-40bb-9710-2b9e204fdc74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_003afae7-a686-42af-9605-ba6fc31be776" xlink:to="loc_us-gaap_NetIncomeLoss_6171f389-f30d-40bb-9710-2b9e204fdc74" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ConsolidatedStatementsofComprehensiveIncomeAmericanAirlinesInc" xlink:type="simple" xlink:href="aal-20251231.xsd#ConsolidatedStatementsofComprehensiveIncomeAmericanAirlinesInc"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ConsolidatedStatementsofComprehensiveIncomeAmericanAirlinesInc" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_7e6d0b41-54a1-4388-9a60-903327bfbb45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_d25df5cc-a26a-4d82-911d-bb5588501422" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_7e6d0b41-54a1-4388-9a60-903327bfbb45" xlink:to="loc_us-gaap_StatementTable_d25df5cc-a26a-4d82-911d-bb5588501422" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_58b1a420-48d3-4c2c-bc06-d1fd84457f88" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_d25df5cc-a26a-4d82-911d-bb5588501422" xlink:to="loc_dei_LegalEntityAxis_58b1a420-48d3-4c2c-bc06-d1fd84457f88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_58b1a420-48d3-4c2c-bc06-d1fd84457f88_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_58b1a420-48d3-4c2c-bc06-d1fd84457f88" xlink:to="loc_dei_EntityDomain_58b1a420-48d3-4c2c-bc06-d1fd84457f88_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3284c962-314d-4b20-94cb-3c6ea1ca711f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_58b1a420-48d3-4c2c-bc06-d1fd84457f88" xlink:to="loc_dei_EntityDomain_3284c962-314d-4b20-94cb-3c6ea1ca711f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_f7d61779-b3e7-4a4f-98db-6d82e23830ca" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_3284c962-314d-4b20-94cb-3c6ea1ca711f" xlink:to="loc_aal_AmericanAirlinesIncMember_f7d61779-b3e7-4a4f-98db-6d82e23830ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_a42a41b9-4359-47d0-a4a0-635abbc1751d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7e6d0b41-54a1-4388-9a60-903327bfbb45" xlink:to="loc_us-gaap_NetIncomeLoss_a42a41b9-4359-47d0-a4a0-635abbc1751d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_c1c39881-d1ac-4987-b435-d4e9cb3b99ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7e6d0b41-54a1-4388-9a60-903327bfbb45" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_c1c39881-d1ac-4987-b435-d4e9cb3b99ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_009c3a7e-2564-46aa-b99f-b8023dc02d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_c1c39881-d1ac-4987-b435-d4e9cb3b99ff" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_009c3a7e-2564-46aa-b99f-b8023dc02d8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_8510f017-c54b-412c-b340-7193ab02e68e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_c1c39881-d1ac-4987-b435-d4e9cb3b99ff" xlink:to="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_8510f017-c54b-412c-b340-7193ab02e68e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_e582509b-448e-4f58-9bc4-8e6a142c52bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_c1c39881-d1ac-4987-b435-d4e9cb3b99ff" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_e582509b-448e-4f58-9bc4-8e6a142c52bb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_a8d79253-6ce4-4f92-9ae4-92d85b962500" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7e6d0b41-54a1-4388-9a60-903327bfbb45" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_a8d79253-6ce4-4f92-9ae4-92d85b962500" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ConsolidatedBalanceSheetsAmericanAirlinesInc" xlink:type="simple" xlink:href="aal-20251231.xsd#ConsolidatedBalanceSheetsAmericanAirlinesInc"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ConsolidatedBalanceSheetsAmericanAirlinesInc" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_29ff0721-e55d-48c1-abe3-6daee0900719" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_726483f0-bfcb-445e-98bc-500ed5e31af4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_29ff0721-e55d-48c1-abe3-6daee0900719" xlink:to="loc_us-gaap_StatementTable_726483f0-bfcb-445e-98bc-500ed5e31af4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_32db7196-8112-468d-b0dc-f2228ccfe7a4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_726483f0-bfcb-445e-98bc-500ed5e31af4" xlink:to="loc_dei_LegalEntityAxis_32db7196-8112-468d-b0dc-f2228ccfe7a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_32db7196-8112-468d-b0dc-f2228ccfe7a4_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_32db7196-8112-468d-b0dc-f2228ccfe7a4" xlink:to="loc_dei_EntityDomain_32db7196-8112-468d-b0dc-f2228ccfe7a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bf6305c4-faf0-429c-8907-f7fee356311f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_32db7196-8112-468d-b0dc-f2228ccfe7a4" xlink:to="loc_dei_EntityDomain_bf6305c4-faf0-429c-8907-f7fee356311f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_031bb307-9240-4f7a-ab4b-4f0970f4ae75" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_bf6305c4-faf0-429c-8907-f7fee356311f" xlink:to="loc_aal_AmericanAirlinesIncMember_031bb307-9240-4f7a-ab4b-4f0970f4ae75" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_d5de0fda-b9b6-4d0c-afd3-87c7656b4005" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_726483f0-bfcb-445e-98bc-500ed5e31af4" xlink:to="loc_srt_ProductOrServiceAxis_d5de0fda-b9b6-4d0c-afd3-87c7656b4005" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_d5de0fda-b9b6-4d0c-afd3-87c7656b4005_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_d5de0fda-b9b6-4d0c-afd3-87c7656b4005" xlink:to="loc_srt_ProductsAndServicesDomain_d5de0fda-b9b6-4d0c-afd3-87c7656b4005_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_1948ab63-98af-4651-af1d-adcfaf02865b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_d5de0fda-b9b6-4d0c-afd3-87c7656b4005" xlink:to="loc_srt_ProductsAndServicesDomain_1948ab63-98af-4651-af1d-adcfaf02865b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AirTrafficMember_b5cbeb4f-f94b-4edc-909b-97056b99feac" xlink:href="aal-20251231.xsd#aal_AirTrafficMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1948ab63-98af-4651-af1d-adcfaf02865b" xlink:to="loc_aal_AirTrafficMember_b5cbeb4f-f94b-4edc-909b-97056b99feac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LoyaltyProgramMember_0fa8732c-1252-40b1-b35b-e31dd5414f0f" xlink:href="aal-20251231.xsd#aal_LoyaltyProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1948ab63-98af-4651-af1d-adcfaf02865b" xlink:to="loc_aal_LoyaltyProgramMember_0fa8732c-1252-40b1-b35b-e31dd5414f0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c6c63-b8cc-755c-bcef-85b31063a117" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_726483f0-bfcb-445e-98bc-500ed5e31af4" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c6c63-b8cc-755c-bcef-85b31063a117" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6c63-b8cc-755c-bcef-85b31063a117_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6c63-b8cc-755c-bcef-85b31063a117" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6c63-b8cc-755c-bcef-85b31063a117_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6c63-b8cc-7eec-aea3-42caf7cc06f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6c63-b8cc-755c-bcef-85b31063a117" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6c63-b8cc-7eec-aea3-42caf7cc06f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FuelFinancingArrangementMember_019c6c63-f04a-7346-a608-11f3659a56c3" xlink:href="aal-20251231.xsd#aal_FuelFinancingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c6c63-b8cc-7eec-aea3-42caf7cc06f8" xlink:to="loc_aal_FuelFinancingArrangementMember_019c6c63-f04a-7346-a608-11f3659a56c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_b9de6794-9925-4da8-ab88-a1bb9dfdbee2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_29ff0721-e55d-48c1-abe3-6daee0900719" xlink:to="loc_us-gaap_AssetsAbstract_b9de6794-9925-4da8-ab88-a1bb9dfdbee2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_417ec0de-6e30-49c6-a033-db45d8836181" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b9de6794-9925-4da8-ab88-a1bb9dfdbee2" xlink:to="loc_us-gaap_AssetsCurrentAbstract_417ec0de-6e30-49c6-a033-db45d8836181" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_2c334000-6ec7-4688-a0ef-ca0917a57d11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Cash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_417ec0de-6e30-49c6-a033-db45d8836181" xlink:to="loc_us-gaap_Cash_2c334000-6ec7-4688-a0ef-ca0917a57d11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_adbdb6c5-ab1b-46b6-92ae-7406711c9e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_417ec0de-6e30-49c6-a033-db45d8836181" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_adbdb6c5-ab1b-46b6-92ae-7406711c9e2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndInvestmentsCurrent_475e603d-60ef-44b7-b81d-0f9bb2ce9191" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndInvestmentsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_417ec0de-6e30-49c6-a033-db45d8836181" xlink:to="loc_us-gaap_RestrictedCashAndInvestmentsCurrent_475e603d-60ef-44b7-b81d-0f9bb2ce9191" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_30a60315-c1aa-4401-aa2f-3dacf94dbc03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_417ec0de-6e30-49c6-a033-db45d8836181" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_30a60315-c1aa-4401-aa2f-3dacf94dbc03" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_e30f9ae5-6abb-4dee-b04c-c48ac5f7014a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_417ec0de-6e30-49c6-a033-db45d8836181" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_e30f9ae5-6abb-4dee-b04c-c48ac5f7014a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineRelatedInventoryNet_7fbda13e-4d8e-49be-b54f-904f5ba30fbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineRelatedInventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_417ec0de-6e30-49c6-a033-db45d8836181" xlink:to="loc_us-gaap_AirlineRelatedInventoryNet_7fbda13e-4d8e-49be-b54f-904f5ba30fbd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_04918ac6-9afb-456e-8354-bd97d8ef6b71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_417ec0de-6e30-49c6-a033-db45d8836181" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_04918ac6-9afb-456e-8354-bd97d8ef6b71" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_2b795fd0-d824-447b-9ec0-0e5f20a58769" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_417ec0de-6e30-49c6-a033-db45d8836181" xlink:to="loc_us-gaap_AssetsCurrent_2b795fd0-d824-447b-9ec0-0e5f20a58769" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_5a7bee3b-bcf8-46c2-829c-1cd8f41f36b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b9de6794-9925-4da8-ab88-a1bb9dfdbee2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_5a7bee3b-bcf8-46c2-829c-1cd8f41f36b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FlightEquipmentGross_858471ac-0b73-4679-9d67-64076e2439e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FlightEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_5a7bee3b-bcf8-46c2-829c-1cd8f41f36b5" xlink:to="loc_us-gaap_FlightEquipmentGross_858471ac-0b73-4679-9d67-64076e2439e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_GroundPropertyAndEquipmentGross_067f3aab-c9d7-44ff-b069-87019f56b8b9" xlink:href="aal-20251231.xsd#aal_GroundPropertyAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_5a7bee3b-bcf8-46c2-829c-1cd8f41f36b5" xlink:to="loc_aal_GroundPropertyAndEquipmentGross_067f3aab-c9d7-44ff-b069-87019f56b8b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepositsOnFlightEquipment_c4cbd9cd-911d-4e1a-8d91-dd521a7be568" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepositsOnFlightEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_5a7bee3b-bcf8-46c2-829c-1cd8f41f36b5" xlink:to="loc_us-gaap_DepositsOnFlightEquipment_c4cbd9cd-911d-4e1a-8d91-dd521a7be568" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_efd3f90e-4d62-45a8-9a2b-495000e6765a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_5a7bee3b-bcf8-46c2-829c-1cd8f41f36b5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_efd3f90e-4d62-45a8-9a2b-495000e6765a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_57f5930c-2393-4412-8702-e7f29ca94ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_5a7bee3b-bcf8-46c2-829c-1cd8f41f36b5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_57f5930c-2393-4412-8702-e7f29ca94ff3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_eb3d6165-e614-4348-896c-03e69d1fbba4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_5a7bee3b-bcf8-46c2-829c-1cd8f41f36b5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_eb3d6165-e614-4348-896c-03e69d1fbba4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_74474eb6-a8c4-49f6-930e-f6933318936d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b9de6794-9925-4da8-ab88-a1bb9dfdbee2" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_74474eb6-a8c4-49f6-930e-f6933318936d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrentAbstract_4472a229-abb4-43b5-af32-2ae6929e177c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b9de6794-9925-4da8-ab88-a1bb9dfdbee2" xlink:to="loc_us-gaap_OtherAssetsNoncurrentAbstract_4472a229-abb4-43b5-af32-2ae6929e177c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_3a964720-2295-4a22-af93-5da51d1bcc97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_4472a229-abb4-43b5-af32-2ae6929e177c" xlink:to="loc_us-gaap_Goodwill_3a964720-2295-4a22-af93-5da51d1bcc97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_888297cf-504f-4447-aa40-7f8789ac73e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_4472a229-abb4-43b5-af32-2ae6929e177c" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_888297cf-504f-4447-aa40-7f8789ac73e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_5f808bc3-793d-4552-9350-f5b816d0289c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_4472a229-abb4-43b5-af32-2ae6929e177c" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_5f808bc3-793d-4552-9350-f5b816d0289c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_faff6fda-1654-473f-94d2-eeafc2306503" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_4472a229-abb4-43b5-af32-2ae6929e177c" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_faff6fda-1654-473f-94d2-eeafc2306503" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_cac2c498-7d67-4680-84b1-d614c7dda69b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_4472a229-abb4-43b5-af32-2ae6929e177c" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_cac2c498-7d67-4680-84b1-d614c7dda69b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_b519b0b9-005d-4cb8-ab99-73d80399eac5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b9de6794-9925-4da8-ab88-a1bb9dfdbee2" xlink:to="loc_us-gaap_Assets_b519b0b9-005d-4cb8-ab99-73d80399eac5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_b8f58191-9fdf-44c4-a888-6432c275d4b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_29ff0721-e55d-48c1-abe3-6daee0900719" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_b8f58191-9fdf-44c4-a888-6432c275d4b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_06a58d4f-9758-445b-a0f7-7dd5e86299c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_b8f58191-9fdf-44c4-a888-6432c275d4b0" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_06a58d4f-9758-445b-a0f7-7dd5e86299c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_3799220c-aa8d-4b7d-a8cb-01e218f6ef5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_06a58d4f-9758-445b-a0f7-7dd5e86299c7" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_3799220c-aa8d-4b7d-a8cb-01e218f6ef5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_32bc19f2-be8a-4d96-aa0b-e58c0dcb5fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_06a58d4f-9758-445b-a0f7-7dd5e86299c7" xlink:to="loc_us-gaap_AccountsPayableCurrent_32bc19f2-be8a-4d96-aa0b-e58c0dcb5fc2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_18e83739-ea2c-4a59-96ba-840fbcaed5bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_06a58d4f-9758-445b-a0f7-7dd5e86299c7" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_18e83739-ea2c-4a59-96ba-840fbcaed5bf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_6f2a5ad8-6b9c-4891-a3ba-3a6eef8b34f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_06a58d4f-9758-445b-a0f7-7dd5e86299c7" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_6f2a5ad8-6b9c-4891-a3ba-3a6eef8b34f2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_45a715bb-cd56-47aa-a938-7dd9ad5f73fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_06a58d4f-9758-445b-a0f7-7dd5e86299c7" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_45a715bb-cd56-47aa-a938-7dd9ad5f73fc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBankLoansAndNotesPayable_019bb3e8-8059-73f5-a4ed-686302013f02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBankLoansAndNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_06a58d4f-9758-445b-a0f7-7dd5e86299c7" xlink:to="loc_us-gaap_ShortTermBankLoansAndNotesPayable_019bb3e8-8059-73f5-a4ed-686302013f02" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_70e3041e-e3ab-41f2-91cf-0c6754320178" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_06a58d4f-9758-445b-a0f7-7dd5e86299c7" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_70e3041e-e3ab-41f2-91cf-0c6754320178" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_591afd7f-2d5e-44e7-ab3c-2d0a5d4dabfd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_06a58d4f-9758-445b-a0f7-7dd5e86299c7" xlink:to="loc_us-gaap_LiabilitiesCurrent_591afd7f-2d5e-44e7-ab3c-2d0a5d4dabfd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_7eecb5c4-f177-41f9-9e9a-eedc57e0697a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_b8f58191-9fdf-44c4-a888-6432c275d4b0" xlink:to="loc_us-gaap_LiabilitiesNoncurrentAbstract_7eecb5c4-f177-41f9-9e9a-eedc57e0697a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_9e1cd279-72ff-4308-a9c6-6df83e201d80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_7eecb5c4-f177-41f9-9e9a-eedc57e0697a" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_9e1cd279-72ff-4308-a9c6-6df83e201d80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_f8146a14-df7a-45a4-93cc-9f67f4f987da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_7eecb5c4-f177-41f9-9e9a-eedc57e0697a" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_f8146a14-df7a-45a4-93cc-9f67f4f987da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_91f875b8-7930-428f-ac62-1df6b3c196cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_7eecb5c4-f177-41f9-9e9a-eedc57e0697a" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_91f875b8-7930-428f-ac62-1df6b3c196cb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_dd305c06-ec4f-4cd4-ad36-0a6ec83ae5b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_7eecb5c4-f177-41f9-9e9a-eedc57e0697a" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_dd305c06-ec4f-4cd4-ad36-0a6ec83ae5b7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_3090a339-d984-478f-b643-fc49bd9d2bdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_7eecb5c4-f177-41f9-9e9a-eedc57e0697a" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_3090a339-d984-478f-b643-fc49bd9d2bdd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_15b617ce-817f-40a6-91aa-0642983cca2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_7eecb5c4-f177-41f9-9e9a-eedc57e0697a" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_15b617ce-817f-40a6-91aa-0642983cca2e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_3896f993-6b32-4cf4-87a6-16c18b99f704" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_b8f58191-9fdf-44c4-a888-6432c275d4b0" xlink:to="loc_us-gaap_CommitmentsAndContingencies_3896f993-6b32-4cf4-87a6-16c18b99f704" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_87426bab-fb18-404d-9d03-2c9b2776795d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_b8f58191-9fdf-44c4-a888-6432c275d4b0" xlink:to="loc_us-gaap_StockholdersEquityAbstract_87426bab-fb18-404d-9d03-2c9b2776795d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_0c553a92-91eb-4603-8e89-6a4efd5ad3e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_87426bab-fb18-404d-9d03-2c9b2776795d" xlink:to="loc_us-gaap_CommonStockValue_0c553a92-91eb-4603-8e89-6a4efd5ad3e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_cca74ea9-72d3-4222-8ed9-71c54186691f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_87426bab-fb18-404d-9d03-2c9b2776795d" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_cca74ea9-72d3-4222-8ed9-71c54186691f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_fe24e88a-e057-46e0-81ca-cc17a186cd13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_87426bab-fb18-404d-9d03-2c9b2776795d" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_fe24e88a-e057-46e0-81ca-cc17a186cd13" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_cf252892-3654-4d4b-b8c1-1f7c7913fe2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_87426bab-fb18-404d-9d03-2c9b2776795d" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_cf252892-3654-4d4b-b8c1-1f7c7913fe2f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_46c76116-20b5-48e2-973b-6e9c6fe98d24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_87426bab-fb18-404d-9d03-2c9b2776795d" xlink:to="loc_us-gaap_StockholdersEquity_46c76116-20b5-48e2-973b-6e9c6fe98d24" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_d9ed0f6d-2715-4b95-9f2a-682e36a9383f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_b8f58191-9fdf-44c4-a888-6432c275d4b0" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_d9ed0f6d-2715-4b95-9f2a-682e36a9383f" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ConsolidatedBalanceSheetsAmericanAirlinesIncParenthetical" xlink:type="simple" xlink:href="aal-20251231.xsd#ConsolidatedBalanceSheetsAmericanAirlinesIncParenthetical"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ConsolidatedBalanceSheetsAmericanAirlinesIncParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_c63a3ab3-d9ef-490d-b5d3-e32fd701c8fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_4d6fdbde-5524-4f6a-9630-9e5fcec9cfb1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_c63a3ab3-d9ef-490d-b5d3-e32fd701c8fa" xlink:to="loc_us-gaap_StatementTable_4d6fdbde-5524-4f6a-9630-9e5fcec9cfb1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_e72d3eb2-a192-427c-9da2-0c2cd7ca3616" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4d6fdbde-5524-4f6a-9630-9e5fcec9cfb1" xlink:to="loc_dei_LegalEntityAxis_e72d3eb2-a192-427c-9da2-0c2cd7ca3616" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e72d3eb2-a192-427c-9da2-0c2cd7ca3616_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_e72d3eb2-a192-427c-9da2-0c2cd7ca3616" xlink:to="loc_dei_EntityDomain_e72d3eb2-a192-427c-9da2-0c2cd7ca3616_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e949b3b3-fb76-4475-aed0-92da177efcfe" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_e72d3eb2-a192-427c-9da2-0c2cd7ca3616" xlink:to="loc_dei_EntityDomain_e949b3b3-fb76-4475-aed0-92da177efcfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_b2a892bf-83e2-44a2-ad64-749b4a657470" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_e949b3b3-fb76-4475-aed0-92da177efcfe" xlink:to="loc_aal_AmericanAirlinesIncMember_b2a892bf-83e2-44a2-ad64-749b4a657470" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_1f946ec1-535b-431f-b85d-9043d4ccb57e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c63a3ab3-d9ef-490d-b5d3-e32fd701c8fa" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_1f946ec1-535b-431f-b85d-9043d4ccb57e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_56167819-8fb3-4bb2-815a-74775d63deb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c63a3ab3-d9ef-490d-b5d3-e32fd701c8fa" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_56167819-8fb3-4bb2-815a-74775d63deb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_302bb8de-99c4-424b-bd30-4534d7c203a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c63a3ab3-d9ef-490d-b5d3-e32fd701c8fa" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_302bb8de-99c4-424b-bd30-4534d7c203a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_814fdd91-c10e-42e1-a173-f7b12f7c69ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c63a3ab3-d9ef-490d-b5d3-e32fd701c8fa" xlink:to="loc_us-gaap_CommonStockSharesIssued_814fdd91-c10e-42e1-a173-f7b12f7c69ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_2ba2afcd-86f0-40d3-958e-c9fd7c327dd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c63a3ab3-d9ef-490d-b5d3-e32fd701c8fa" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_2ba2afcd-86f0-40d3-958e-c9fd7c327dd3" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ConsolidatedStatementsofCashFlowsAmericanAirlinesInc" xlink:type="simple" xlink:href="aal-20251231.xsd#ConsolidatedStatementsofCashFlowsAmericanAirlinesInc"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ConsolidatedStatementsofCashFlowsAmericanAirlinesInc" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_e7b33507-9e1c-4c21-aced-89221b07732d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_b01adc2d-9a00-43c6-99ca-cc8bec6f1035" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_e7b33507-9e1c-4c21-aced-89221b07732d" xlink:to="loc_us-gaap_StatementTable_b01adc2d-9a00-43c6-99ca-cc8bec6f1035" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_1865ce83-e849-4722-8443-9d8471321e09" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_b01adc2d-9a00-43c6-99ca-cc8bec6f1035" xlink:to="loc_srt_ProductOrServiceAxis_1865ce83-e849-4722-8443-9d8471321e09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_1865ce83-e849-4722-8443-9d8471321e09_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_1865ce83-e849-4722-8443-9d8471321e09" xlink:to="loc_srt_ProductsAndServicesDomain_1865ce83-e849-4722-8443-9d8471321e09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_d8638e5b-83a2-49cd-bdee-995c552cb277" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_1865ce83-e849-4722-8443-9d8471321e09" xlink:to="loc_srt_ProductsAndServicesDomain_d8638e5b-83a2-49cd-bdee-995c552cb277" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AirTrafficMember_10f84f31-28a5-4721-b63f-1b051d33c853" xlink:href="aal-20251231.xsd#aal_AirTrafficMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_d8638e5b-83a2-49cd-bdee-995c552cb277" xlink:to="loc_aal_AirTrafficMember_10f84f31-28a5-4721-b63f-1b051d33c853" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LoyaltyProgramMember_aec55c2a-d65f-44a1-900e-31e16bc5de27" xlink:href="aal-20251231.xsd#aal_LoyaltyProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_d8638e5b-83a2-49cd-bdee-995c552cb277" xlink:to="loc_aal_LoyaltyProgramMember_aec55c2a-d65f-44a1-900e-31e16bc5de27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_29421c2e-7a93-4056-9fd6-60b068a1ebe5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_b01adc2d-9a00-43c6-99ca-cc8bec6f1035" xlink:to="loc_dei_LegalEntityAxis_29421c2e-7a93-4056-9fd6-60b068a1ebe5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_29421c2e-7a93-4056-9fd6-60b068a1ebe5_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_29421c2e-7a93-4056-9fd6-60b068a1ebe5" xlink:to="loc_dei_EntityDomain_29421c2e-7a93-4056-9fd6-60b068a1ebe5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_81271740-64f8-41fd-8b59-773ec73fd963" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_29421c2e-7a93-4056-9fd6-60b068a1ebe5" xlink:to="loc_dei_EntityDomain_81271740-64f8-41fd-8b59-773ec73fd963" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_821a06f9-cf96-4e59-aa1d-5cd5c92e804d" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_81271740-64f8-41fd-8b59-773ec73fd963" xlink:to="loc_aal_AmericanAirlinesIncMember_821a06f9-cf96-4e59-aa1d-5cd5c92e804d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c6c67-f85e-7692-8796-ee8749875a63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_b01adc2d-9a00-43c6-99ca-cc8bec6f1035" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c6c67-f85e-7692-8796-ee8749875a63" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6c67-f85e-7692-8796-ee8749875a63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6c67-f85e-7692-8796-ee8749875a63" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6c67-f85e-7692-8796-ee8749875a63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6c67-f85e-7fcf-bf5a-708bb03b0ee7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6c67-f85e-7692-8796-ee8749875a63" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6c67-f85e-7fcf-bf5a-708bb03b0ee7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FuelFinancingArrangementMember_019c6c68-2496-7154-b15d-674bb85ca4ec" xlink:href="aal-20251231.xsd#aal_FuelFinancingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c6c67-f85e-7fcf-bf5a-708bb03b0ee7" xlink:to="loc_aal_FuelFinancingArrangementMember_019c6c68-2496-7154-b15d-674bb85ca4ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_11054866-af62-460c-94be-fc49a4466c22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e7b33507-9e1c-4c21-aced-89221b07732d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_11054866-af62-460c-94be-fc49a4466c22" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_716b5a78-7a96-4042-b34c-386c9c56b922" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_11054866-af62-460c-94be-fc49a4466c22" xlink:to="loc_us-gaap_NetIncomeLoss_716b5a78-7a96-4042-b34c-386c9c56b922" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6603e614-9870-457a-b654-f1662a619e36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_11054866-af62-460c-94be-fc49a4466c22" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6603e614-9870-457a-b654-f1662a619e36" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_MainlineAndExpressDepreciationAndAmortization_99eb69da-1fa8-4f23-bd8a-e4eb004ba8b3" xlink:href="aal-20251231.xsd#aal_MainlineAndExpressDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6603e614-9870-457a-b654-f1662a619e36" xlink:to="loc_aal_MainlineAndExpressDepreciationAndAmortization_99eb69da-1fa8-4f23-bd8a-e4eb004ba8b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_8bfbb473-0048-4d37-a6be-553e90683f8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6603e614-9870-457a-b654-f1662a619e36" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_8bfbb473-0048-4d37-a6be-553e90683f8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SpecialChargesNonCash_6bb0b959-eb4d-4666-8489-03a4ad34fcc2" xlink:href="aal-20251231.xsd#aal_SpecialChargesNonCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6603e614-9870-457a-b654-f1662a619e36" xlink:to="loc_aal_SpecialChargesNonCash_6bb0b959-eb4d-4666-8489-03a4ad34fcc2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash_334eb222-a0b3-4b95-a549-d7d3e2206077" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6603e614-9870-457a-b654-f1662a619e36" xlink:to="loc_us-gaap_PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash_334eb222-a0b3-4b95-a549-d7d3e2206077" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_e26111c5-c3e7-454e-9c6d-c9b82e345a7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6603e614-9870-457a-b654-f1662a619e36" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_e26111c5-c3e7-454e-9c6d-c9b82e345a7a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_ac6ca955-40b1-4358-b686-2fc5ce70ceac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6603e614-9870-457a-b654-f1662a619e36" xlink:to="loc_us-gaap_ShareBasedCompensation_ac6ca955-40b1-4358-b686-2fc5ce70ceac" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_d301a053-9fd9-4d25-b9a8-00fb5761a456" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_6603e614-9870-457a-b654-f1662a619e36" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_d301a053-9fd9-4d25-b9a8-00fb5761a456" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_61b93aac-21e7-4e32-a294-89e956e3d0c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_11054866-af62-460c-94be-fc49a4466c22" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_61b93aac-21e7-4e32-a294-89e956e3d0c8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_0359a156-40a0-4938-b566-9b81c4802fd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_61b93aac-21e7-4e32-a294-89e956e3d0c8" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_0359a156-40a0-4938-b566-9b81c4802fd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_8282a919-e424-4708-8db3-961bc180d108" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_61b93aac-21e7-4e32-a294-89e956e3d0c8" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_8282a919-e424-4708-8db3-961bc180d108" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_26048e57-de64-400a-b10f-b50991965353" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_61b93aac-21e7-4e32-a294-89e956e3d0c8" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_26048e57-de64-400a-b10f-b50991965353" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_6dbcb1ac-6564-4094-92c1-ab9e32a19123" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_61b93aac-21e7-4e32-a294-89e956e3d0c8" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_6dbcb1ac-6564-4094-92c1-ab9e32a19123" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDueFromRelatedParties_bae992b7-e8d0-4d54-b955-958aafff73c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInDueFromRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_61b93aac-21e7-4e32-a294-89e956e3d0c8" xlink:to="loc_us-gaap_IncreaseDecreaseInDueFromRelatedParties_bae992b7-e8d0-4d54-b955-958aafff73c6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPensionPlanObligations_9ea34f81-4ef9-4b5c-9296-c56b7113c8c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInPensionPlanObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_61b93aac-21e7-4e32-a294-89e956e3d0c8" xlink:to="loc_us-gaap_IncreaseDecreaseInPensionPlanObligations_9ea34f81-4ef9-4b5c-9296-c56b7113c8c5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_b16b75be-e75b-4838-a1c9-a7ab065bbfee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_61b93aac-21e7-4e32-a294-89e956e3d0c8" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_b16b75be-e75b-4838-a1c9-a7ab065bbfee" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_8b18901f-5c2d-4424-a76a-6ddc820c396f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_11054866-af62-460c-94be-fc49a4466c22" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_8b18901f-5c2d-4424-a76a-6ddc820c396f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8367f023-b2c6-443f-91c0-b3627323a961" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e7b33507-9e1c-4c21-aced-89221b07732d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8367f023-b2c6-443f-91c0-b3627323a961" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_d2391709-f95c-424e-b7eb-8d39c9733856" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8367f023-b2c6-443f-91c0-b3627323a961" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_d2391709-f95c-424e-b7eb-8d39c9733856" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ProceedsFromSaleOfPropertyPlantAndEquipmentAndSaleLeasebackTransactions_f0b6b868-1836-4185-91d0-7665f775a04e" xlink:href="aal-20251231.xsd#aal_ProceedsFromSaleOfPropertyPlantAndEquipmentAndSaleLeasebackTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8367f023-b2c6-443f-91c0-b3627323a961" xlink:to="loc_aal_ProceedsFromSaleOfPropertyPlantAndEquipmentAndSaleLeasebackTransactions_f0b6b868-1836-4185-91d0-7665f775a04e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfShortTermInvestments_948cd49c-0048-472a-847e-7fae34d55506" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8367f023-b2c6-443f-91c0-b3627323a961" xlink:to="loc_us-gaap_ProceedsFromSaleOfShortTermInvestments_948cd49c-0048-472a-847e-7fae34d55506" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_5a362ea4-fac1-4ceb-84ef-b0a69b45f67b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8367f023-b2c6-443f-91c0-b3627323a961" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_5a362ea4-fac1-4ceb-84ef-b0a69b45f67b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseOfRestrictedInvestments_6eda9215-c3f6-4362-9c53-4ef6f0ba14cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseOfRestrictedInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8367f023-b2c6-443f-91c0-b3627323a961" xlink:to="loc_us-gaap_IncreaseDecreaseOfRestrictedInvestments_6eda9215-c3f6-4362-9c53-4ef6f0ba14cb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_60070a05-25e0-494f-9441-0377868d1a0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8367f023-b2c6-443f-91c0-b3627323a961" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_60070a05-25e0-494f-9441-0377868d1a0e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_59ada96f-3604-413b-bbb8-54f741d6e7be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8367f023-b2c6-443f-91c0-b3627323a961" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_59ada96f-3604-413b-bbb8-54f741d6e7be" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ae7fee81-d57b-4cf6-a2b0-8d4daf855550" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e7b33507-9e1c-4c21-aced-89221b07732d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ae7fee81-d57b-4cf6-a2b0-8d4daf855550" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations_b8ca3f6a-593d-45f2-9234-37825cd7baa1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ae7fee81-d57b-4cf6-a2b0-8d4daf855550" xlink:to="loc_us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations_b8ca3f6a-593d-45f2-9234-37825cd7baa1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_9df0c987-10c5-4242-89c3-992bbb8e14ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ae7fee81-d57b-4cf6-a2b0-8d4daf855550" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_9df0c987-10c5-4242-89c3-992bbb8e14ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_NetProceedsFromShortTermLoansAndNotesPayable_019c2a94-ac88-7b22-9c54-928dfb22a120" xlink:href="aal-20251231.xsd#aal_NetProceedsFromShortTermLoansAndNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ae7fee81-d57b-4cf6-a2b0-8d4daf855550" xlink:to="loc_aal_NetProceedsFromShortTermLoansAndNotesPayable_019c2a94-ac88-7b22-9c54-928dfb22a120" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_62d2443a-e73b-4428-9e0b-53f781af20fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ae7fee81-d57b-4cf6-a2b0-8d4daf855550" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_62d2443a-e73b-4428-9e0b-53f781af20fc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_249d3edc-d5bb-4e96-860e-f5710d6a65a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ae7fee81-d57b-4cf6-a2b0-8d4daf855550" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_249d3edc-d5bb-4e96-860e-f5710d6a65a9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_6b35a8c6-08d5-4700-af20-3657177ee9d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e7b33507-9e1c-4c21-aced-89221b07732d" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_6b35a8c6-08d5-4700-af20-3657177ee9d1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_a09f8d28-2e74-4f53-aa60-f7990b8f21ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e7b33507-9e1c-4c21-aced-89221b07732d" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_a09f8d28-2e74-4f53-aa60-f7990b8f21ba" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_6bdba848-b7df-44e4-b899-886a56e6de9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ConsolidatedStatementsofCashFlowsAmericanAirlinesIncParenthetical" xlink:type="simple" xlink:href="aal-20251231.xsd#ConsolidatedStatementsofCashFlowsAmericanAirlinesIncParenthetical"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ConsolidatedStatementsofCashFlowsAmericanAirlinesIncParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_d6335ec1-448b-49dd-9df8-fa2437caae28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_00b9da8b-a522-4496-8158-7de6fa67eaef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_d6335ec1-448b-49dd-9df8-fa2437caae28" xlink:to="loc_us-gaap_StatementTable_00b9da8b-a522-4496-8158-7de6fa67eaef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_3d46d750-a7e4-459c-b076-5e3a5d6a5b29" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_00b9da8b-a522-4496-8158-7de6fa67eaef" xlink:to="loc_dei_LegalEntityAxis_3d46d750-a7e4-459c-b076-5e3a5d6a5b29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3d46d750-a7e4-459c-b076-5e3a5d6a5b29_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_3d46d750-a7e4-459c-b076-5e3a5d6a5b29" xlink:to="loc_dei_EntityDomain_3d46d750-a7e4-459c-b076-5e3a5d6a5b29_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_131df7fa-9df7-4933-a8ef-a045a1f0ef44" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_3d46d750-a7e4-459c-b076-5e3a5d6a5b29" xlink:to="loc_dei_EntityDomain_131df7fa-9df7-4933-a8ef-a045a1f0ef44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_2d3c7ce3-7683-47c9-bc3b-3d50af51486f" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_131df7fa-9df7-4933-a8ef-a045a1f0ef44" xlink:to="loc_aal_AmericanAirlinesIncMember_2d3c7ce3-7683-47c9-bc3b-3d50af51486f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_3082ca64-0bf7-4d4a-8b31-52359934951a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Cash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d6335ec1-448b-49dd-9df8-fa2437caae28" xlink:to="loc_us-gaap_Cash_3082ca64-0bf7-4d4a-8b31-52359934951a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashCurrent_4e951f59-373a-4f8c-8455-b88c2369aecc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d6335ec1-448b-49dd-9df8-fa2437caae28" xlink:to="loc_us-gaap_RestrictedCashCurrent_4e951f59-373a-4f8c-8455-b88c2369aecc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_02c70278-3b93-4bb6-ae48-6ec439e5d62a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d6335ec1-448b-49dd-9df8-fa2437caae28" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_02c70278-3b93-4bb6-ae48-6ec439e5d62a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ConsolidatedStatementsofStockholdersEquityAmericanAirlinesInc" xlink:type="simple" xlink:href="aal-20251231.xsd#ConsolidatedStatementsofStockholdersEquityAmericanAirlinesInc"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ConsolidatedStatementsofStockholdersEquityAmericanAirlinesInc" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_3bcec994-9398-4664-8754-82a4cc731c7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_a9db9e27-dea5-4df9-9293-9e32d4c70e57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_3bcec994-9398-4664-8754-82a4cc731c7b" xlink:to="loc_us-gaap_StatementTable_a9db9e27-dea5-4df9-9293-9e32d4c70e57" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_c4fe340c-c1ab-4185-922e-9051311f9093" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_a9db9e27-dea5-4df9-9293-9e32d4c70e57" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_c4fe340c-c1ab-4185-922e-9051311f9093" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_c4fe340c-c1ab-4185-922e-9051311f9093_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_c4fe340c-c1ab-4185-922e-9051311f9093" xlink:to="loc_us-gaap_EquityComponentDomain_c4fe340c-c1ab-4185-922e-9051311f9093_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f52636d5-a71a-49a9-a7d5-1cd28d1af386" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_c4fe340c-c1ab-4185-922e-9051311f9093" xlink:to="loc_us-gaap_EquityComponentDomain_f52636d5-a71a-49a9-a7d5-1cd28d1af386" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_dc501ba2-6ac6-4ada-9090-f31165151344" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f52636d5-a71a-49a9-a7d5-1cd28d1af386" xlink:to="loc_us-gaap_CommonStockMember_dc501ba2-6ac6-4ada-9090-f31165151344" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_8580c078-fe6d-4c28-999a-cb5ea2c531d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f52636d5-a71a-49a9-a7d5-1cd28d1af386" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_8580c078-fe6d-4c28-999a-cb5ea2c531d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_fa2d53f8-94a2-4065-ad34-a94b92692274" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f52636d5-a71a-49a9-a7d5-1cd28d1af386" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_fa2d53f8-94a2-4065-ad34-a94b92692274" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_5327f192-f6f0-4565-b16c-5de32c0234aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f52636d5-a71a-49a9-a7d5-1cd28d1af386" xlink:to="loc_us-gaap_RetainedEarningsMember_5327f192-f6f0-4565-b16c-5de32c0234aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_e3fc5012-485e-4b6c-8678-b86999a8619c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_a9db9e27-dea5-4df9-9293-9e32d4c70e57" xlink:to="loc_dei_LegalEntityAxis_e3fc5012-485e-4b6c-8678-b86999a8619c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e3fc5012-485e-4b6c-8678-b86999a8619c_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_e3fc5012-485e-4b6c-8678-b86999a8619c" xlink:to="loc_dei_EntityDomain_e3fc5012-485e-4b6c-8678-b86999a8619c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_69956798-fcc8-4d7b-8888-1061a1883c72" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_e3fc5012-485e-4b6c-8678-b86999a8619c" xlink:to="loc_dei_EntityDomain_69956798-fcc8-4d7b-8888-1061a1883c72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_11d47066-d3c9-45b8-98e0-f985d6d7ce8b" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_69956798-fcc8-4d7b-8888-1061a1883c72" xlink:to="loc_aal_AmericanAirlinesIncMember_11d47066-d3c9-45b8-98e0-f985d6d7ce8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8b58fbc5-5dca-40c4-98ed-fc32590f8a3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3bcec994-9398-4664-8754-82a4cc731c7b" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8b58fbc5-5dca-40c4-98ed-fc32590f8a3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_2eab9c1f-7081-4e9c-8da3-ae2bfd9de4e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8b58fbc5-5dca-40c4-98ed-fc32590f8a3f" xlink:to="loc_us-gaap_StockholdersEquity_2eab9c1f-7081-4e9c-8da3-ae2bfd9de4e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_c0ab7922-49c3-45cb-bb4a-2a1080f6ec2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8b58fbc5-5dca-40c4-98ed-fc32590f8a3f" xlink:to="loc_us-gaap_NetIncomeLoss_c0ab7922-49c3-45cb-bb4a-2a1080f6ec2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_0928f997-addb-43d5-8e11-08a3d176b6ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8b58fbc5-5dca-40c4-98ed-fc32590f8a3f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_0928f997-addb-43d5-8e11-08a3d176b6ad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_5fddf1cc-82d4-43c3-a255-25eea95131a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8b58fbc5-5dca-40c4-98ed-fc32590f8a3f" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_5fddf1cc-82d4-43c3-a255-25eea95131a1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AdjustmentsToAdditionalPaidInCapitalModificationOfShareBasedAwards_cf1f780b-7681-43f1-a8ce-1d4e1b669f71" xlink:href="aal-20251231.xsd#aal_AdjustmentsToAdditionalPaidInCapitalModificationOfShareBasedAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8b58fbc5-5dca-40c4-98ed-fc32590f8a3f" xlink:to="loc_aal_AdjustmentsToAdditionalPaidInCapitalModificationOfShareBasedAwards_cf1f780b-7681-43f1-a8ce-1d4e1b669f71" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_IntercompanyEquityTransfer_a30d9865-92a0-4828-8fcf-4cf04a3bf43f" xlink:href="aal-20251231.xsd#aal_IntercompanyEquityTransfer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8b58fbc5-5dca-40c4-98ed-fc32590f8a3f" xlink:to="loc_aal_IntercompanyEquityTransfer_a30d9865-92a0-4828-8fcf-4cf04a3bf43f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_f83b73ee-1df4-4c7e-8cfa-52a5fa46cb13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies" xlink:type="simple" xlink:href="aal-20251231.xsd#BasisofPresentationandSummaryofSignificantAccountingPolicies"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_60891362-ddcc-45df-971a-24100888381a" xlink:href="aal-20251231.xsd#aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_ea72e761-4ae7-4118-bab4-63f7b56e0b31" xlink:href="aal-20251231.xsd#aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_60891362-ddcc-45df-971a-24100888381a" xlink:to="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_ea72e761-4ae7-4118-bab4-63f7b56e0b31" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_34e5d9ee-1742-4783-bd62-983ca0adfbdc" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_ea72e761-4ae7-4118-bab4-63f7b56e0b31" xlink:to="loc_dei_LegalEntityAxis_34e5d9ee-1742-4783-bd62-983ca0adfbdc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_34e5d9ee-1742-4783-bd62-983ca0adfbdc_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_34e5d9ee-1742-4783-bd62-983ca0adfbdc" xlink:to="loc_dei_EntityDomain_34e5d9ee-1742-4783-bd62-983ca0adfbdc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_f8f76fc0-70b6-46b8-9522-ff5232aaace4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_34e5d9ee-1742-4783-bd62-983ca0adfbdc" xlink:to="loc_dei_EntityDomain_f8f76fc0-70b6-46b8-9522-ff5232aaace4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_30d225a3-c857-43fd-aa9a-042d3d6fac2e" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_f8f76fc0-70b6-46b8-9522-ff5232aaace4" xlink:to="loc_aal_AmericanAirlinesIncMember_30d225a3-c857-43fd-aa9a-042d3d6fac2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock_fed02a78-4c56-472e-a980-9daf02944dd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_60891362-ddcc-45df-971a-24100888381a" xlink:to="loc_us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock_fed02a78-4c56-472e-a980-9daf02944dd7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SpecialItemsNet" xlink:type="simple" xlink:href="aal-20251231.xsd#SpecialItemsNet"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SpecialItemsNet" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_908f4dea-af4a-48bc-85d4-cbd2e0c7fe94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_58c6494a-2ba7-4802-bb8e-f59b890a5a45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_908f4dea-af4a-48bc-85d4-cbd2e0c7fe94" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_58c6494a-2ba7-4802-bb8e-f59b890a5a45" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_5c90f916-942e-4b30-9148-0fcc01b83a10" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_58c6494a-2ba7-4802-bb8e-f59b890a5a45" xlink:to="loc_dei_LegalEntityAxis_5c90f916-942e-4b30-9148-0fcc01b83a10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_5c90f916-942e-4b30-9148-0fcc01b83a10_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_5c90f916-942e-4b30-9148-0fcc01b83a10" xlink:to="loc_dei_EntityDomain_5c90f916-942e-4b30-9148-0fcc01b83a10_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6ffc6c9e-85f8-4026-9c6d-a2ce276101dd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_5c90f916-942e-4b30-9148-0fcc01b83a10" xlink:to="loc_dei_EntityDomain_6ffc6c9e-85f8-4026-9c6d-a2ce276101dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_145b2ac8-2147-4480-af5d-f90a8c33c992" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6ffc6c9e-85f8-4026-9c6d-a2ce276101dd" xlink:to="loc_aal_AmericanAirlinesIncMember_145b2ac8-2147-4480-af5d-f90a8c33c992" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_62615e51-7008-457c-8483-99e77e12986c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_908f4dea-af4a-48bc-85d4-cbd2e0c7fe94" xlink:to="loc_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_62615e51-7008-457c-8483-99e77e12986c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/Debt" xlink:type="simple" xlink:href="aal-20251231.xsd#Debt"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/Debt" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_a359b880-37f2-4ed8-8b93-e1be12350329" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_af366fb2-bc8e-4eab-9c2d-5652a9d893ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a359b880-37f2-4ed8-8b93-e1be12350329" xlink:to="loc_us-gaap_DebtInstrumentTable_af366fb2-bc8e-4eab-9c2d-5652a9d893ba" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_d14b3cd0-cf41-4852-9ec5-56abfeb368ea" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_af366fb2-bc8e-4eab-9c2d-5652a9d893ba" xlink:to="loc_dei_LegalEntityAxis_d14b3cd0-cf41-4852-9ec5-56abfeb368ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d14b3cd0-cf41-4852-9ec5-56abfeb368ea_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_d14b3cd0-cf41-4852-9ec5-56abfeb368ea" xlink:to="loc_dei_EntityDomain_d14b3cd0-cf41-4852-9ec5-56abfeb368ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_109a3b07-251d-4d98-9a83-6b1543050b24" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_d14b3cd0-cf41-4852-9ec5-56abfeb368ea" xlink:to="loc_dei_EntityDomain_109a3b07-251d-4d98-9a83-6b1543050b24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_359e2995-3a7b-4c58-88f9-3a63ddcd87c0" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_109a3b07-251d-4d98-9a83-6b1543050b24" xlink:to="loc_aal_AmericanAirlinesIncMember_359e2995-3a7b-4c58-88f9-3a63ddcd87c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureTextBlock_16c0721f-cc20-4f85-940e-4ccfd3511346" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtDisclosureTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a359b880-37f2-4ed8-8b93-e1be12350329" xlink:to="loc_us-gaap_DebtDisclosureTextBlock_16c0721f-cc20-4f85-940e-4ccfd3511346" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/Leases" xlink:type="simple" xlink:href="aal-20251231.xsd#Leases"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/Leases" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_60061089-e18a-487c-8784-ac922eb1e420" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_c9f4a3cc-e243-4936-8ccd-8c002790e3ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_60061089-e18a-487c-8784-ac922eb1e420" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_c9f4a3cc-e243-4936-8ccd-8c002790e3ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_75795313-b66a-4e34-b648-0a4277c3ad3c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_c9f4a3cc-e243-4936-8ccd-8c002790e3ad" xlink:to="loc_dei_LegalEntityAxis_75795313-b66a-4e34-b648-0a4277c3ad3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_75795313-b66a-4e34-b648-0a4277c3ad3c_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_75795313-b66a-4e34-b648-0a4277c3ad3c" xlink:to="loc_dei_EntityDomain_75795313-b66a-4e34-b648-0a4277c3ad3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_db2a7095-e362-4887-9f62-2273a4ba43a6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_75795313-b66a-4e34-b648-0a4277c3ad3c" xlink:to="loc_dei_EntityDomain_db2a7095-e362-4887-9f62-2273a4ba43a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_18b863ba-f43d-4e09-93b8-5db585581d6b" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_db2a7095-e362-4887-9f62-2273a4ba43a6" xlink:to="loc_aal_AmericanAirlinesIncMember_18b863ba-f43d-4e09-93b8-5db585581d6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeFinanceLeasesTextBlock_87396a43-155d-474b-a364-9e75f69681bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeFinanceLeasesTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_60061089-e18a-487c-8784-ac922eb1e420" xlink:to="loc_us-gaap_LesseeFinanceLeasesTextBlock_87396a43-155d-474b-a364-9e75f69681bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeasesTextBlock_c69326c4-a5e9-40e2-a9db-543cadac6d64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeasesTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_60061089-e18a-487c-8784-ac922eb1e420" xlink:to="loc_us-gaap_LesseeOperatingLeasesTextBlock_c69326c4-a5e9-40e2-a9db-543cadac6d64" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/IncomeTaxes" xlink:type="simple" xlink:href="aal-20251231.xsd#IncomeTaxes"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/IncomeTaxes" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aal_IncomeTaxesLineItems_691493b4-2571-44fc-88eb-fcca51f2d0ce" xlink:href="aal-20251231.xsd#aal_IncomeTaxesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_IncomeTaxesTable_156bc8af-02b5-48bf-bfc6-129ed87c9da8" xlink:href="aal-20251231.xsd#aal_IncomeTaxesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_aal_IncomeTaxesLineItems_691493b4-2571-44fc-88eb-fcca51f2d0ce" xlink:to="loc_aal_IncomeTaxesTable_156bc8af-02b5-48bf-bfc6-129ed87c9da8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_53cce697-b793-45c7-8550-1f7262550c0b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_IncomeTaxesTable_156bc8af-02b5-48bf-bfc6-129ed87c9da8" xlink:to="loc_dei_LegalEntityAxis_53cce697-b793-45c7-8550-1f7262550c0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_53cce697-b793-45c7-8550-1f7262550c0b_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_53cce697-b793-45c7-8550-1f7262550c0b" xlink:to="loc_dei_EntityDomain_53cce697-b793-45c7-8550-1f7262550c0b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_80fc81d5-c899-468d-ac28-727f7e93eef1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_53cce697-b793-45c7-8550-1f7262550c0b" xlink:to="loc_dei_EntityDomain_80fc81d5-c899-468d-ac28-727f7e93eef1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_eac56dcd-c288-4ad8-85ae-e755a97b0605" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_80fc81d5-c899-468d-ac28-727f7e93eef1" xlink:to="loc_aal_AmericanAirlinesIncMember_eac56dcd-c288-4ad8-85ae-e755a97b0605" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureTextBlock_88505ade-6457-4ca6-99a5-7cab13b6888a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxDisclosureTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxesLineItems_691493b4-2571-44fc-88eb-fcca51f2d0ce" xlink:to="loc_us-gaap_IncomeTaxDisclosureTextBlock_88505ade-6457-4ca6-99a5-7cab13b6888a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/FairValueMeasurements" xlink:type="simple" xlink:href="aal-20251231.xsd#FairValueMeasurements"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/FairValueMeasurements" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0485f443-4b05-4f4c-81a3-8359e7a7f17b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_d50a281e-05db-4035-b55e-f99710262e61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0485f443-4b05-4f4c-81a3-8359e7a7f17b" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_d50a281e-05db-4035-b55e-f99710262e61" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_56db9078-5afc-43bb-ab7c-ab6f22ef9859" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_d50a281e-05db-4035-b55e-f99710262e61" xlink:to="loc_dei_LegalEntityAxis_56db9078-5afc-43bb-ab7c-ab6f22ef9859" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_56db9078-5afc-43bb-ab7c-ab6f22ef9859_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_56db9078-5afc-43bb-ab7c-ab6f22ef9859" xlink:to="loc_dei_EntityDomain_56db9078-5afc-43bb-ab7c-ab6f22ef9859_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_df8a59a9-5f29-462f-84c8-88c2166f2ea5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_56db9078-5afc-43bb-ab7c-ab6f22ef9859" xlink:to="loc_dei_EntityDomain_df8a59a9-5f29-462f-84c8-88c2166f2ea5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_e6128c7e-0be9-4d5c-97e1-7d844cef2c79" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_df8a59a9-5f29-462f-84c8-88c2166f2ea5" xlink:to="loc_aal_AmericanAirlinesIncMember_e6128c7e-0be9-4d5c-97e1-7d844cef2c79" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresTextBlock_a5ca1be7-d03d-4eb8-ad3f-21f6078814f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosuresTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0485f443-4b05-4f4c-81a3-8359e7a7f17b" xlink:to="loc_us-gaap_FairValueDisclosuresTextBlock_a5ca1be7-d03d-4eb8-ad3f-21f6078814f3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/Investments" xlink:type="simple" xlink:href="aal-20251231.xsd#Investments"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/Investments" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_4ed588cf-5010-4036-92cf-89488da3fed0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_6e0fe54d-325d-481e-9975-1e5ac2a9a714" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_4ed588cf-5010-4036-92cf-89488da3fed0" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_6e0fe54d-325d-481e-9975-1e5ac2a9a714" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_f943412b-7b47-4efd-8402-350639c2f642" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_6e0fe54d-325d-481e-9975-1e5ac2a9a714" xlink:to="loc_dei_LegalEntityAxis_f943412b-7b47-4efd-8402-350639c2f642" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_f943412b-7b47-4efd-8402-350639c2f642_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_f943412b-7b47-4efd-8402-350639c2f642" xlink:to="loc_dei_EntityDomain_f943412b-7b47-4efd-8402-350639c2f642_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6f429c60-4bf6-4bcd-8649-9cb4ab6b61fb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_f943412b-7b47-4efd-8402-350639c2f642" xlink:to="loc_dei_EntityDomain_6f429c60-4bf6-4bcd-8649-9cb4ab6b61fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_d86df653-9917-4e11-97ec-52dc971e7bfa" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6f429c60-4bf6-4bcd-8649-9cb4ab6b61fb" xlink:to="loc_aal_AmericanAirlinesIncMember_d86df653-9917-4e11-97ec-52dc971e7bfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTextBlock_85e60ae9-2ef7-4cf2-b96b-699f1dd84bd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_4ed588cf-5010-4036-92cf-89488da3fed0" xlink:to="loc_us-gaap_InvestmentTextBlock_85e60ae9-2ef7-4cf2-b96b-699f1dd84bd2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlans" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlans"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlans" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0e96eef9-883c-4364-a451-5f7075834a0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ab2e469a-a87b-4f3e-9d21-33bad2d80d53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0e96eef9-883c-4364-a451-5f7075834a0b" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ab2e469a-a87b-4f3e-9d21-33bad2d80d53" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_a4e9d7fc-bf66-487b-baca-970cd98c2f1e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ab2e469a-a87b-4f3e-9d21-33bad2d80d53" xlink:to="loc_dei_LegalEntityAxis_a4e9d7fc-bf66-487b-baca-970cd98c2f1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a4e9d7fc-bf66-487b-baca-970cd98c2f1e_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_a4e9d7fc-bf66-487b-baca-970cd98c2f1e" xlink:to="loc_dei_EntityDomain_a4e9d7fc-bf66-487b-baca-970cd98c2f1e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b7226b10-080d-47e0-b144-5968bb6e5899" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_a4e9d7fc-bf66-487b-baca-970cd98c2f1e" xlink:to="loc_dei_EntityDomain_b7226b10-080d-47e0-b144-5968bb6e5899" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_b52988d4-7ad2-4fce-b2b5-b15174e4a404" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_b7226b10-080d-47e0-b144-5968bb6e5899" xlink:to="loc_aal_AmericanAirlinesIncMember_b52988d4-7ad2-4fce-b2b5-b15174e4a404" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_a76156a4-c9e5-4908-9bd9-c1829991e2a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0e96eef9-883c-4364-a451-5f7075834a0b" xlink:to="loc_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_a76156a4-c9e5-4908-9bd9-c1829991e2a4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/AccumulatedOtherComprehensiveLoss" xlink:type="simple" xlink:href="aal-20251231.xsd#AccumulatedOtherComprehensiveLoss"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/AccumulatedOtherComprehensiveLoss" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d3f351ec-0645-4c62-b7bc-0611c6705a0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_4e1dfd8e-f8c6-4c4b-9ccb-7bef2150571b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d3f351ec-0645-4c62-b7bc-0611c6705a0a" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_4e1dfd8e-f8c6-4c4b-9ccb-7bef2150571b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_933e79e3-6928-4acc-9b02-242c326509df" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_4e1dfd8e-f8c6-4c4b-9ccb-7bef2150571b" xlink:to="loc_dei_LegalEntityAxis_933e79e3-6928-4acc-9b02-242c326509df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_933e79e3-6928-4acc-9b02-242c326509df_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_933e79e3-6928-4acc-9b02-242c326509df" xlink:to="loc_dei_EntityDomain_933e79e3-6928-4acc-9b02-242c326509df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_58aafb9e-9c70-4dec-8f22-9ac14abdcf83" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_933e79e3-6928-4acc-9b02-242c326509df" xlink:to="loc_dei_EntityDomain_58aafb9e-9c70-4dec-8f22-9ac14abdcf83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_8077d771-11d3-42ef-ab23-10446e803bd2" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_58aafb9e-9c70-4dec-8f22-9ac14abdcf83" xlink:to="loc_aal_AmericanAirlinesIncMember_8077d771-11d3-42ef-ab23-10446e803bd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNoteTextBlock_deeff55b-d4d0-4e0f-8bf6-789d2ffa6cc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNoteTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d3f351ec-0645-4c62-b7bc-0611c6705a0a" xlink:to="loc_us-gaap_ComprehensiveIncomeNoteTextBlock_deeff55b-d4d0-4e0f-8bf6-789d2ffa6cc1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/CommitmentsContingenciesandGuarantees" xlink:type="simple" xlink:href="aal-20251231.xsd#CommitmentsContingenciesandGuarantees"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/CommitmentsContingenciesandGuarantees" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aal_CommitmentsandContingenciesLineItems_34d84e5a-e5aa-4409-addf-fffa1e9e34b4" xlink:href="aal-20251231.xsd#aal_CommitmentsandContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CommitmentsandContingenciesTable_e352cf40-22c3-4ce6-ac57-182d8938a9d3" xlink:href="aal-20251231.xsd#aal_CommitmentsandContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_aal_CommitmentsandContingenciesLineItems_34d84e5a-e5aa-4409-addf-fffa1e9e34b4" xlink:to="loc_aal_CommitmentsandContingenciesTable_e352cf40-22c3-4ce6-ac57-182d8938a9d3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_226e0bae-98d0-4418-bbac-6664d0e9c2ad" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_CommitmentsandContingenciesTable_e352cf40-22c3-4ce6-ac57-182d8938a9d3" xlink:to="loc_dei_LegalEntityAxis_226e0bae-98d0-4418-bbac-6664d0e9c2ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_226e0bae-98d0-4418-bbac-6664d0e9c2ad_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_226e0bae-98d0-4418-bbac-6664d0e9c2ad" xlink:to="loc_dei_EntityDomain_226e0bae-98d0-4418-bbac-6664d0e9c2ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_82ee8e2d-b7db-4488-88cb-b03c66f45393" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_226e0bae-98d0-4418-bbac-6664d0e9c2ad" xlink:to="loc_dei_EntityDomain_82ee8e2d-b7db-4488-88cb-b03c66f45393" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_390ff74b-c553-4bbc-a100-c809d4fcebbe" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_82ee8e2d-b7db-4488-88cb-b03c66f45393" xlink:to="loc_aal_AmericanAirlinesIncMember_390ff74b-c553-4bbc-a100-c809d4fcebbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock_3f5f2f66-2c1a-4a1d-a6b2-1e458295b128" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_CommitmentsandContingenciesLineItems_34d84e5a-e5aa-4409-addf-fffa1e9e34b4" xlink:to="loc_us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock_3f5f2f66-2c1a-4a1d-a6b2-1e458295b128" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SupplementalCashFlowInformation" xlink:type="simple" xlink:href="aal-20251231.xsd#SupplementalCashFlowInformation"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SupplementalCashFlowInformation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_fcfd5a92-c9dc-49ef-9885-d9b3d77b304e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherSignificantNoncashTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionsTable_3a147df2-681a-4801-b3d2-c8da34693c0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherSignificantNoncashTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_fcfd5a92-c9dc-49ef-9885-d9b3d77b304e" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionsTable_3a147df2-681a-4801-b3d2-c8da34693c0a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_d02204f8-b2e1-4494-9b58-0420a1ac3def" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsTable_3a147df2-681a-4801-b3d2-c8da34693c0a" xlink:to="loc_dei_LegalEntityAxis_d02204f8-b2e1-4494-9b58-0420a1ac3def" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d02204f8-b2e1-4494-9b58-0420a1ac3def_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_d02204f8-b2e1-4494-9b58-0420a1ac3def" xlink:to="loc_dei_EntityDomain_d02204f8-b2e1-4494-9b58-0420a1ac3def_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_18c0eca8-b5e3-4347-b1b9-f6ff073a3d4c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_d02204f8-b2e1-4494-9b58-0420a1ac3def" xlink:to="loc_dei_EntityDomain_18c0eca8-b5e3-4347-b1b9-f6ff073a3d4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_b5b8d0ff-78d4-4a32-a378-bc1272eba468" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_18c0eca8-b5e3-4347-b1b9-f6ff073a3d4c" xlink:to="loc_aal_AmericanAirlinesIncMember_b5b8d0ff-78d4-4a32-a378-bc1272eba468" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowSupplementalDisclosuresTextBlock_d8d5e90e-31ee-495d-b783-e03253925ee8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowSupplementalDisclosuresTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_fcfd5a92-c9dc-49ef-9885-d9b3d77b304e" xlink:to="loc_us-gaap_CashFlowSupplementalDisclosuresTextBlock_d8d5e90e-31ee-495d-b783-e03253925ee8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SegmentDisclosures" xlink:type="simple" xlink:href="aal-20251231.xsd#SegmentDisclosures"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SegmentDisclosures" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_4a1872c1-4ad6-4243-8b3c-f497102d7fa6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_4a42160a-5f87-4817-a708-70d2d63fd0bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4a1872c1-4ad6-4243-8b3c-f497102d7fa6" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_4a42160a-5f87-4817-a708-70d2d63fd0bf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_a89df3d5-0462-4017-9bfb-365b7260894a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_4a42160a-5f87-4817-a708-70d2d63fd0bf" xlink:to="loc_dei_LegalEntityAxis_a89df3d5-0462-4017-9bfb-365b7260894a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a89df3d5-0462-4017-9bfb-365b7260894a_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_a89df3d5-0462-4017-9bfb-365b7260894a" xlink:to="loc_dei_EntityDomain_a89df3d5-0462-4017-9bfb-365b7260894a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_75e76b84-b61a-49d2-a0c7-e83545ec0e94" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_a89df3d5-0462-4017-9bfb-365b7260894a" xlink:to="loc_dei_EntityDomain_75e76b84-b61a-49d2-a0c7-e83545ec0e94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_7b4f77bc-e8a7-43ea-bdf8-7ea36c5b7a09" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_75e76b84-b61a-49d2-a0c7-e83545ec0e94" xlink:to="loc_aal_AmericanAirlinesIncMember_7b4f77bc-e8a7-43ea-bdf8-7ea36c5b7a09" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingDisclosureTextBlock_9627b2ad-cbf4-481e-a432-f1d31090e400" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingDisclosureTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4a1872c1-4ad6-4243-8b3c-f497102d7fa6" xlink:to="loc_us-gaap_SegmentReportingDisclosureTextBlock_9627b2ad-cbf4-481e-a432-f1d31090e400" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SharebasedCompensation" xlink:type="simple" xlink:href="aal-20251231.xsd#SharebasedCompensation"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SharebasedCompensation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7bc56389-953f-4ba9-b023-f93ee31aaecb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a87eacf6-9b89-4b35-850b-1948541d57d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7bc56389-953f-4ba9-b023-f93ee31aaecb" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a87eacf6-9b89-4b35-850b-1948541d57d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_e895985c-3ab2-44c6-b2a7-15e52e92f6d1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a87eacf6-9b89-4b35-850b-1948541d57d1" xlink:to="loc_dei_LegalEntityAxis_e895985c-3ab2-44c6-b2a7-15e52e92f6d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e895985c-3ab2-44c6-b2a7-15e52e92f6d1_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_e895985c-3ab2-44c6-b2a7-15e52e92f6d1" xlink:to="loc_dei_EntityDomain_e895985c-3ab2-44c6-b2a7-15e52e92f6d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6656667b-efb3-428a-8174-9d114c04f222" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_e895985c-3ab2-44c6-b2a7-15e52e92f6d1" xlink:to="loc_dei_EntityDomain_6656667b-efb3-428a-8174-9d114c04f222" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_6e9b4323-10e8-4031-bd9e-8b588af17794" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6656667b-efb3-428a-8174-9d114c04f222" xlink:to="loc_aal_AmericanAirlinesIncMember_6e9b4323-10e8-4031-bd9e-8b588af17794" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_fc780b3a-2e8b-47ba-b69d-77ce16a73a18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7bc56389-953f-4ba9-b023-f93ee31aaecb" xlink:to="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_fc780b3a-2e8b-47ba-b69d-77ce16a73a18" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ValuationandQualifyingAccounts" xlink:type="simple" xlink:href="aal-20251231.xsd#ValuationandQualifyingAccounts"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ValuationandQualifyingAccounts" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_64f37512-56e7-4bd9-b762-2aeee568e55e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ValuationAndQualifyingAccountsDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_afb67ddf-7e15-4e7f-a304-88b0404c59b7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ValuationAndQualifyingAccountsDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_64f37512-56e7-4bd9-b762-2aeee568e55e" xlink:to="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_afb67ddf-7e15-4e7f-a304-88b0404c59b7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_dcefc483-cbab-4d33-b9ce-99cac3533788" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_afb67ddf-7e15-4e7f-a304-88b0404c59b7" xlink:to="loc_dei_LegalEntityAxis_dcefc483-cbab-4d33-b9ce-99cac3533788" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_dcefc483-cbab-4d33-b9ce-99cac3533788_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_dcefc483-cbab-4d33-b9ce-99cac3533788" xlink:to="loc_dei_EntityDomain_dcefc483-cbab-4d33-b9ce-99cac3533788_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_40d5b0a9-2922-46e7-90ee-568c5b7dfab6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_dcefc483-cbab-4d33-b9ce-99cac3533788" xlink:to="loc_dei_EntityDomain_40d5b0a9-2922-46e7-90ee-568c5b7dfab6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_74333241-7354-44b3-b197-334a90303925" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_40d5b0a9-2922-46e7-90ee-568c5b7dfab6" xlink:to="loc_aal_AmericanAirlinesIncMember_74333241-7354-44b3-b197-334a90303925" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_e08f3f32-09aa-46ee-9bb5-0546465da74c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_64f37512-56e7-4bd9-b762-2aeee568e55e" xlink:to="loc_srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_e08f3f32-09aa-46ee-9bb5-0546465da74c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/TransactionswithRelatedParties" xlink:type="simple" xlink:href="aal-20251231.xsd#TransactionswithRelatedParties"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/TransactionswithRelatedParties" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_c2be7878-41c5-4dcf-ba38-9fdc98cb4333" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_d5484f53-ccfd-46cc-ae31-15054723d217" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_c2be7878-41c5-4dcf-ba38-9fdc98cb4333" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_d5484f53-ccfd-46cc-ae31-15054723d217" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_a4509a41-f800-4fea-92c8-db0b3b1c1d71" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_d5484f53-ccfd-46cc-ae31-15054723d217" xlink:to="loc_dei_LegalEntityAxis_a4509a41-f800-4fea-92c8-db0b3b1c1d71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a4509a41-f800-4fea-92c8-db0b3b1c1d71_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_a4509a41-f800-4fea-92c8-db0b3b1c1d71" xlink:to="loc_dei_EntityDomain_a4509a41-f800-4fea-92c8-db0b3b1c1d71_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_955a699a-d5d2-488d-8abf-df7b2c777c07" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_a4509a41-f800-4fea-92c8-db0b3b1c1d71" xlink:to="loc_dei_EntityDomain_955a699a-d5d2-488d-8abf-df7b2c777c07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_25b199de-d7b1-4d40-93dc-d5267bc5b7fd" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_955a699a-d5d2-488d-8abf-df7b2c777c07" xlink:to="loc_aal_AmericanAirlinesIncMember_25b199de-d7b1-4d40-93dc-d5267bc5b7fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_773bed4d-7f08-4bf7-ac20-597a9dac93f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_c2be7878-41c5-4dcf-ba38-9fdc98cb4333" xlink:to="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_773bed4d-7f08-4bf7-ac20-597a9dac93f2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SubsequentEvents" xlink:type="simple" xlink:href="aal-20251231.xsd#SubsequentEvents"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SubsequentEvents" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019c2ec0-7338-7db4-a3c9-e9f19dc2fe4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019c2ebf-a471-77f7-b7fa-1eaacd57fba7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019c2ec0-7338-7db4-a3c9-e9f19dc2fe4d" xlink:to="loc_us-gaap_SubsequentEventTable_019c2ebf-a471-77f7-b7fa-1eaacd57fba7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c2ec1-21eb-7a39-82cb-5f0c0987c60f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019c2ebf-a471-77f7-b7fa-1eaacd57fba7" xlink:to="loc_dei_LegalEntityAxis_019c2ec1-21eb-7a39-82cb-5f0c0987c60f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c2ec1-21eb-7a39-82cb-5f0c0987c60f_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c2ec1-21eb-7a39-82cb-5f0c0987c60f" xlink:to="loc_dei_EntityDomain_019c2ec1-21eb-7a39-82cb-5f0c0987c60f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c2ec1-7c07-7514-bfe9-a770b70c25d4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c2ec1-21eb-7a39-82cb-5f0c0987c60f" xlink:to="loc_dei_EntityDomain_019c2ec1-7c07-7514-bfe9-a770b70c25d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_019c2ec1-a230-715b-bfa1-425fe4e5f7a6" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c2ec1-7c07-7514-bfe9-a770b70c25d4" xlink:to="loc_aal_AmericanAirlinesIncMember_019c2ec1-a230-715b-bfa1-425fe4e5f7a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventsTextBlock_d06dccf6-779c-4afb-b514-8f059f35ee87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019c2ec0-7338-7db4-a3c9-e9f19dc2fe4d" xlink:to="loc_us-gaap_SubsequentEventsTextBlock_d06dccf6-779c-4afb-b514-8f059f35ee87" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies" xlink:type="simple" xlink:href="aal-20251231.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:href="aal-20251231.xsd#aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_019c589c-a308-794d-80dc-255c830c1f3e" xlink:href="aal-20251231.xsd#aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_019c589c-a308-794d-80dc-255c830c1f3e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c589c-f9b5-775e-928f-32d3181b89f7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_019c589c-a308-794d-80dc-255c830c1f3e" xlink:to="loc_dei_LegalEntityAxis_019c589c-f9b5-775e-928f-32d3181b89f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c589c-f9b5-775e-928f-32d3181b89f7_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c589c-f9b5-775e-928f-32d3181b89f7" xlink:to="loc_dei_EntityDomain_019c589c-f9b5-775e-928f-32d3181b89f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c589d-2c10-721b-a049-a5a9dc8bea74" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c589c-f9b5-775e-928f-32d3181b89f7" xlink:to="loc_dei_EntityDomain_019c589d-2c10-721b-a049-a5a9dc8bea74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_019c589d-5901-73b4-a3b4-3cadb7c65320" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c589d-2c10-721b-a049-a5a9dc8bea74" xlink:to="loc_aal_AmericanAirlinesIncMember_019c589d-5901-73b4-a3b4-3cadb7c65320" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_019c589b-27f0-7f72-9f48-2302fe56383b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_019c589b-27f0-7f72-9f48-2302fe56383b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_019c589e-0b11-703b-9610-de0ab9412b1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsolidationPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_ConsolidationPolicyTextBlock_019c589e-0b11-703b-9610-de0ab9412b1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_019c589e-d992-73b4-a2dc-ad5c633aa440" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_019c589e-d992-73b4-a2dc-ad5c633aa440" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentPolicyTextBlock_019c589f-03fa-79f2-a70d-f0e7b0188e72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_InvestmentPolicyTextBlock_019c589f-03fa-79f2-a70d-f0e7b0188e72" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RestrictedCashAndShortTermInvestmentsPolicyPolicyTextBlock_019c589f-2a3d-7509-9877-df587151cc56" xlink:href="aal-20251231.xsd#aal_RestrictedCashAndShortTermInvestmentsPolicyPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_aal_RestrictedCashAndShortTermInvestmentsPolicyPolicyTextBlock_019c589f-2a3d-7509-9877-df587151cc56" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_019c589f-52e8-7755-85a3-5b62b2b52190" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeAndOtherAccountsReceivablePolicy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_019c589f-52e8-7755-85a3-5b62b2b52190" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryPolicyTextBlock_019c589f-7b69-7c56-b5a8-3563d0fd053e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_InventoryPolicyTextBlock_019c589f-7b69-7c56-b5a8-3563d0fd053e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_019c589f-bb01-708f-9e83-d54ab00c685a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_019c589f-bb01-708f-9e83-d54ab00c685a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_019c589f-ebde-7742-a523-aa222a907ee7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_019c589f-ebde-7742-a523-aa222a907ee7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeasesPolicyTextBlock_019c58a0-0fee-7a1a-a198-b10d5270f56f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeasesPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_LesseeLeasesPolicyTextBlock_019c58a0-0fee-7a1a-a198-b10d5270f56f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPolicyTextBlock_019c58a0-3c34-7fa7-981f-1b8b2f9cd6de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_IncomeTaxPolicyTextBlock_019c58a0-3c34-7fa7-981f-1b8b2f9cd6de" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_019c58a0-6117-7840-8e5a-c10760066e8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_019c58a0-6117-7840-8e5a-c10760066e8c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy_019c58a0-8941-7363-bda3-600b40d46981" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy_019c58a0-8941-7363-bda3-600b40d46981" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FuelFinanceProgramPolicyPolicyTextBlock_019c58a0-b125-7d05-bc45-412c56f2544d" xlink:href="aal-20251231.xsd#aal_FuelFinanceProgramPolicyPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_aal_FuelFinanceProgramPolicyPolicyTextBlock_019c58a0-b125-7d05-bc45-412c56f2544d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_019c58a0-e9f9-7f6f-9995-865ada6334ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_019c58a0-e9f9-7f6f-9995-865ada6334ca" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaintenanceCostPolicyPolicyTextBlock_019c58a1-2a40-7a61-b1da-094617e2f918" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MaintenanceCostPolicyPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_MaintenanceCostPolicyPolicyTextBlock_019c58a1-2a40-7a61-b1da-094617e2f918" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesPolicyTextBlock_019c58a1-4d0a-71d4-bbfe-e75cfb361f9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesPolicyTextBlock_019c58a1-4d0a-71d4-bbfe-e75cfb361f9b" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_019c58a1-911c-7157-9b62-93b60d169c66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_019c58a1-911c-7157-9b62-93b60d169c66" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_019c58a1-cb59-7ee6-bb8b-3758ea379f91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_019c58a1-cb59-7ee6-bb8b-3758ea379f91" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OtherCostAndExpenseOperatingPolicyTextBlock_019c58a1-f37d-7155-8c6f-759a55e79263" xlink:href="aal-20251231.xsd#aal_OtherCostAndExpenseOperatingPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_aal_OtherCostAndExpenseOperatingPolicyTextBlock_019c58a1-f37d-7155-8c6f-759a55e79263" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RegionalExpensesPolicyPolicyTextBlock_019c58a2-1e4f-7d57-8c3b-5739905a7237" xlink:href="aal-20251231.xsd#aal_RegionalExpensesPolicyPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_019c589d-a37d-7af1-8dee-41e92f91b46d" xlink:to="loc_aal_RegionalExpensesPolicyPolicyTextBlock_019c58a2-1e4f-7d57-8c3b-5739905a7237" xlink:type="arc" order="20"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesTables" xlink:type="simple" xlink:href="aal-20251231.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_9332957e-0f30-4eac-b71b-1fc3b4a18114" xlink:href="aal-20251231.xsd#aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_2a0a9ea4-7283-4be9-9320-aea3f06de23d" xlink:href="aal-20251231.xsd#aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_9332957e-0f30-4eac-b71b-1fc3b4a18114" xlink:to="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_2a0a9ea4-7283-4be9-9320-aea3f06de23d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_0196aa0e-dc7c-46ac-8419-e3a5d0575b05" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_2a0a9ea4-7283-4be9-9320-aea3f06de23d" xlink:to="loc_dei_LegalEntityAxis_0196aa0e-dc7c-46ac-8419-e3a5d0575b05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_0196aa0e-dc7c-46ac-8419-e3a5d0575b05_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_0196aa0e-dc7c-46ac-8419-e3a5d0575b05" xlink:to="loc_dei_EntityDomain_0196aa0e-dc7c-46ac-8419-e3a5d0575b05_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_af05d028-7eed-47ad-8cf2-3ec08fad0159" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_0196aa0e-dc7c-46ac-8419-e3a5d0575b05" xlink:to="loc_dei_EntityDomain_af05d028-7eed-47ad-8cf2-3ec08fad0159" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_fc798715-97cb-4224-9dd4-05e2ce782872" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_af05d028-7eed-47ad-8cf2-3ec08fad0159" xlink:to="loc_aal_AmericanAirlinesIncMember_fc798715-97cb-4224-9dd4-05e2ce782872" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_85d8d717-f0b6-4178-9988-1d988e50e72b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_9332957e-0f30-4eac-b71b-1fc3b4a18114" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_85d8d717-f0b6-4178-9988-1d988e50e72b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ScheduleOfShortTermLoanAndNotePayableTableTextBlock_019c6c70-cbe9-7b9c-8ecf-08f55bcdd0ee" xlink:href="aal-20251231.xsd#aal_ScheduleOfShortTermLoanAndNotePayableTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_9332957e-0f30-4eac-b71b-1fc3b4a18114" xlink:to="loc_aal_ScheduleOfShortTermLoanAndNotePayableTableTextBlock_019c6c70-cbe9-7b9c-8ecf-08f55bcdd0ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_438e1db0-0e0c-4f18-8140-182a19b47589" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_9332957e-0f30-4eac-b71b-1fc3b4a18114" xlink:to="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_438e1db0-0e0c-4f18-8140-182a19b47589" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_944a51a7-145d-43bb-bd71-b7e4e32d30c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OrganizationBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_9332957e-0f30-4eac-b71b-1fc3b4a18114" xlink:to="loc_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_944a51a7-145d-43bb-bd71-b7e4e32d30c3" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SpecialItemsNetTables" xlink:type="simple" xlink:href="aal-20251231.xsd#SpecialItemsNetTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SpecialItemsNetTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_d0a04d91-9fc9-4375-9a9f-d36cbda3407c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_992d6b47-ec69-4a3f-ad67-b5fe864080c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d0a04d91-9fc9-4375-9a9f-d36cbda3407c" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_992d6b47-ec69-4a3f-ad67-b5fe864080c7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_b1a31549-a181-4848-b40c-d12e19197603" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_992d6b47-ec69-4a3f-ad67-b5fe864080c7" xlink:to="loc_dei_LegalEntityAxis_b1a31549-a181-4848-b40c-d12e19197603" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b1a31549-a181-4848-b40c-d12e19197603_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_b1a31549-a181-4848-b40c-d12e19197603" xlink:to="loc_dei_EntityDomain_b1a31549-a181-4848-b40c-d12e19197603_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ca7f5c6c-9405-4e5a-b3d8-639f543126b2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_b1a31549-a181-4848-b40c-d12e19197603" xlink:to="loc_dei_EntityDomain_ca7f5c6c-9405-4e5a-b3d8-639f543126b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_80e223b2-9bdd-4065-8d30-036e64a94ef6" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_ca7f5c6c-9405-4e5a-b3d8-639f543126b2" xlink:to="loc_aal_AmericanAirlinesIncMember_80e223b2-9bdd-4065-8d30-036e64a94ef6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_4995de9b-6e2b-4e09-ad2d-768f87dc1b21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d0a04d91-9fc9-4375-9a9f-d36cbda3407c" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_4995de9b-6e2b-4e09-ad2d-768f87dc1b21" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtTables" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_29830603-406e-45a7-9b90-8b7c80e98468" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_992b0de3-56e5-4eb6-a160-56faf4fa94b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_29830603-406e-45a7-9b90-8b7c80e98468" xlink:to="loc_us-gaap_DebtInstrumentTable_992b0de3-56e5-4eb6-a160-56faf4fa94b7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_d2950837-5b39-4435-a318-15fafb186b84" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_992b0de3-56e5-4eb6-a160-56faf4fa94b7" xlink:to="loc_dei_LegalEntityAxis_d2950837-5b39-4435-a318-15fafb186b84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d2950837-5b39-4435-a318-15fafb186b84_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_d2950837-5b39-4435-a318-15fafb186b84" xlink:to="loc_dei_EntityDomain_d2950837-5b39-4435-a318-15fafb186b84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bfd3f725-02fc-42fc-9559-ec4ad7983416" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_d2950837-5b39-4435-a318-15fafb186b84" xlink:to="loc_dei_EntityDomain_bfd3f725-02fc-42fc-9559-ec4ad7983416" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_51d37697-b1ea-49a7-be75-42a0464ea9e1" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_bfd3f725-02fc-42fc-9559-ec4ad7983416" xlink:to="loc_aal_AmericanAirlinesIncMember_51d37697-b1ea-49a7-be75-42a0464ea9e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDebtTableTextBlock_7e1b8cb9-da89-4399-b8f3-ec1f495a2a6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDebtTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_29830603-406e-45a7-9b90-8b7c80e98468" xlink:to="loc_us-gaap_ScheduleOfDebtTableTextBlock_7e1b8cb9-da89-4399-b8f3-ec1f495a2a6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock_270c445a-1090-4002-adae-21fdddc792a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_29830603-406e-45a7-9b90-8b7c80e98468" xlink:to="loc_us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock_270c445a-1090-4002-adae-21fdddc792a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_54bf21b0-4143-43d2-8943-f8e744bae225" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_29830603-406e-45a7-9b90-8b7c80e98468" xlink:to="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_54bf21b0-4143-43d2-8943-f8e744bae225" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_019bb39b-939e-7558-b18d-846cd9ca94b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDebtInstrumentsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_29830603-406e-45a7-9b90-8b7c80e98468" xlink:to="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_019bb39b-939e-7558-b18d-846cd9ca94b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ScheduleOfCollateralCoverageTestsTableTextBlock_bf6362e2-b2b6-42fe-9445-48479da383fe" xlink:href="aal-20251231.xsd#aal_ScheduleOfCollateralCoverageTestsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_29830603-406e-45a7-9b90-8b7c80e98468" xlink:to="loc_aal_ScheduleOfCollateralCoverageTestsTableTextBlock_bf6362e2-b2b6-42fe-9445-48479da383fe" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/LeasesTables" xlink:type="simple" xlink:href="aal-20251231.xsd#LeasesTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/LeasesTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_dcc2339c-d694-4dd2-b70d-165c0f7baaf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_9052ee5b-75a3-493e-a9d2-e038fa2106c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_dcc2339c-d694-4dd2-b70d-165c0f7baaf6" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_9052ee5b-75a3-493e-a9d2-e038fa2106c9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_3f966db2-af83-4ebc-90a5-65cc9095a9a2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_9052ee5b-75a3-493e-a9d2-e038fa2106c9" xlink:to="loc_dei_LegalEntityAxis_3f966db2-af83-4ebc-90a5-65cc9095a9a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3f966db2-af83-4ebc-90a5-65cc9095a9a2_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_3f966db2-af83-4ebc-90a5-65cc9095a9a2" xlink:to="loc_dei_EntityDomain_3f966db2-af83-4ebc-90a5-65cc9095a9a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d1d44209-1ed8-4190-9ce9-bf9e716db010" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_3f966db2-af83-4ebc-90a5-65cc9095a9a2" xlink:to="loc_dei_EntityDomain_d1d44209-1ed8-4190-9ce9-bf9e716db010" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_71d4e8d1-528a-4ca4-be3d-a1ed247836f2" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_d1d44209-1ed8-4190-9ce9-bf9e716db010" xlink:to="loc_aal_AmericanAirlinesIncMember_71d4e8d1-528a-4ca4-be3d-a1ed247836f2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCostTableTextBlock_5acb152b-bc90-47cf-964c-4618a50c6ac4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseCostTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_dcc2339c-d694-4dd2-b70d-165c0f7baaf6" xlink:to="loc_us-gaap_LeaseCostTableTextBlock_5acb152b-bc90-47cf-964c-4618a50c6ac4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AssetsandLiabilitiesLesseeTableTextBlock_82a500a0-4a29-4a82-a9f3-0d36d41c5964" xlink:href="aal-20251231.xsd#aal_AssetsandLiabilitiesLesseeTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_dcc2339c-d694-4dd2-b70d-165c0f7baaf6" xlink:to="loc_aal_AssetsandLiabilitiesLesseeTableTextBlock_82a500a0-4a29-4a82-a9f3-0d36d41c5964" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CashFlowLesseeTableTextBlock_521560e4-e3dc-4ef7-b942-a5b365d38627" xlink:href="aal-20251231.xsd#aal_CashFlowLesseeTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_dcc2339c-d694-4dd2-b70d-165c0f7baaf6" xlink:to="loc_aal_CashFlowLesseeTableTextBlock_521560e4-e3dc-4ef7-b942-a5b365d38627" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_c01f5a4b-4735-4385-85e5-71c59b0456ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_dcc2339c-d694-4dd2-b70d-165c0f7baaf6" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_c01f5a4b-4735-4385-85e5-71c59b0456ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_40523a59-ea9e-475b-95b3-00447ab48512" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_dcc2339c-d694-4dd2-b70d-165c0f7baaf6" xlink:to="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_40523a59-ea9e-475b-95b3-00447ab48512" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/IncomeTaxesTables" xlink:type="simple" xlink:href="aal-20251231.xsd#IncomeTaxesTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/IncomeTaxesTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aal_IncomeTaxesLineItems_af279e6d-8887-4061-bf0d-5700abd485c3" xlink:href="aal-20251231.xsd#aal_IncomeTaxesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_IncomeTaxesTable_73cbc18f-9d07-41a2-a1ad-e5062c046cd0" xlink:href="aal-20251231.xsd#aal_IncomeTaxesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_aal_IncomeTaxesLineItems_af279e6d-8887-4061-bf0d-5700abd485c3" xlink:to="loc_aal_IncomeTaxesTable_73cbc18f-9d07-41a2-a1ad-e5062c046cd0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_9826a8fd-57c4-4440-98d8-7ddd3fca31b5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_IncomeTaxesTable_73cbc18f-9d07-41a2-a1ad-e5062c046cd0" xlink:to="loc_dei_LegalEntityAxis_9826a8fd-57c4-4440-98d8-7ddd3fca31b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_9826a8fd-57c4-4440-98d8-7ddd3fca31b5_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_9826a8fd-57c4-4440-98d8-7ddd3fca31b5" xlink:to="loc_dei_EntityDomain_9826a8fd-57c4-4440-98d8-7ddd3fca31b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3757d1e6-9fd9-4e9d-99b8-964d64e1474c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_9826a8fd-57c4-4440-98d8-7ddd3fca31b5" xlink:to="loc_dei_EntityDomain_3757d1e6-9fd9-4e9d-99b8-964d64e1474c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_ed3a5b0d-5abd-432a-aff3-28d68f23154e" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_3757d1e6-9fd9-4e9d-99b8-964d64e1474c" xlink:to="loc_aal_AmericanAirlinesIncMember_ed3a5b0d-5abd-432a-aff3-28d68f23154e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_a3a99f4f-da91-41ee-ab19-4f029ea4539d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxesLineItems_af279e6d-8887-4061-bf0d-5700abd485c3" xlink:to="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_a3a99f4f-da91-41ee-ab19-4f029ea4539d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_fcc9d975-8be9-4e4f-ac72-5e24fa58e860" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxesLineItems_af279e6d-8887-4061-bf0d-5700abd485c3" xlink:to="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_fcc9d975-8be9-4e4f-ac72-5e24fa58e860" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_b1e075b3-7b23-466d-94b4-ce87bf60de66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxesLineItems_af279e6d-8887-4061-bf0d-5700abd485c3" xlink:to="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_b1e075b3-7b23-466d-94b4-ce87bf60de66" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/FairValueMeasurementsTables" xlink:type="simple" xlink:href="aal-20251231.xsd#FairValueMeasurementsTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/FairValueMeasurementsTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ea66e86b-46a5-4287-a4a7-cd1bf6164fa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_4ae07d73-b0ae-4c2e-9cd5-a02b7ca31358" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ea66e86b-46a5-4287-a4a7-cd1bf6164fa7" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_4ae07d73-b0ae-4c2e-9cd5-a02b7ca31358" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_77499b35-76ed-441a-8320-25d43e29e611" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_4ae07d73-b0ae-4c2e-9cd5-a02b7ca31358" xlink:to="loc_dei_LegalEntityAxis_77499b35-76ed-441a-8320-25d43e29e611" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_77499b35-76ed-441a-8320-25d43e29e611_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_77499b35-76ed-441a-8320-25d43e29e611" xlink:to="loc_dei_EntityDomain_77499b35-76ed-441a-8320-25d43e29e611_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_2dc7774a-9da4-4f73-b4dd-4a29203e1658" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_77499b35-76ed-441a-8320-25d43e29e611" xlink:to="loc_dei_EntityDomain_2dc7774a-9da4-4f73-b4dd-4a29203e1658" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_9e810ed7-09b4-4bf2-be60-6e173aabd3f3" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_2dc7774a-9da4-4f73-b4dd-4a29203e1658" xlink:to="loc_aal_AmericanAirlinesIncMember_9e810ed7-09b4-4bf2-be60-6e173aabd3f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_594f3b63-024b-4ee2-86d2-212f758c52ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ea66e86b-46a5-4287-a4a7-cd1bf6164fa7" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_594f3b63-024b-4ee2-86d2-212f758c52ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock_947db772-ea7c-48e7-a348-c56db4952513" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ea66e86b-46a5-4287-a4a7-cd1bf6164fa7" xlink:to="loc_us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock_947db772-ea7c-48e7-a348-c56db4952513" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/InvestmentsTables" xlink:type="simple" xlink:href="aal-20251231.xsd#InvestmentsTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/InvestmentsTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_3c2b8fdc-0397-4e87-8580-5c2032af5cd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_c8b7fc46-8e9a-4364-84d7-99755f3195f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_3c2b8fdc-0397-4e87-8580-5c2032af5cd4" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_c8b7fc46-8e9a-4364-84d7-99755f3195f1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_ba8acf38-6406-4725-838d-5d202b15f22e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_c8b7fc46-8e9a-4364-84d7-99755f3195f1" xlink:to="loc_dei_LegalEntityAxis_ba8acf38-6406-4725-838d-5d202b15f22e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ba8acf38-6406-4725-838d-5d202b15f22e_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_ba8acf38-6406-4725-838d-5d202b15f22e" xlink:to="loc_dei_EntityDomain_ba8acf38-6406-4725-838d-5d202b15f22e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a7396a05-1b45-4b55-bd45-6a080c84179b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_ba8acf38-6406-4725-838d-5d202b15f22e" xlink:to="loc_dei_EntityDomain_a7396a05-1b45-4b55-bd45-6a080c84179b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_25e918ad-0894-472a-af81-ff71e59845f9" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_a7396a05-1b45-4b55-bd45-6a080c84179b" xlink:to="loc_aal_AmericanAirlinesIncMember_25e918ad-0894-472a-af81-ff71e59845f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTableTextBlock_810a7c62-0785-40f1-885f-6ca858d10d86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_3c2b8fdc-0397-4e87-8580-5c2032af5cd4" xlink:to="loc_us-gaap_InvestmentTableTextBlock_810a7c62-0785-40f1-885f-6ca858d10d86" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansTables" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d8674361-6544-4416-813c-5ae8fc66b75d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8237d808-48e8-4deb-908a-f341eea620e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d8674361-6544-4416-813c-5ae8fc66b75d" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8237d808-48e8-4deb-908a-f341eea620e8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_7f59f151-eb72-4318-8e60-a58b01286d59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8237d808-48e8-4deb-908a-f341eea620e8" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_7f59f151-eb72-4318-8e60-a58b01286d59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_7f59f151-eb72-4318-8e60-a58b01286d59_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_7f59f151-eb72-4318-8e60-a58b01286d59" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_7f59f151-eb72-4318-8e60-a58b01286d59_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_0e417a1f-b677-41e5-b9a6-0500abaea386" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_7f59f151-eb72-4318-8e60-a58b01286d59" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_0e417a1f-b677-41e5-b9a6-0500abaea386" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_bd3d8012-0bde-4e80-9c41-41bfbd8bc8b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_0e417a1f-b677-41e5-b9a6-0500abaea386" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_bd3d8012-0bde-4e80-9c41-41bfbd8bc8b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_ee0300b0-ead3-4b50-9ad0-39a638643a19" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_8237d808-48e8-4deb-908a-f341eea620e8" xlink:to="loc_dei_LegalEntityAxis_ee0300b0-ead3-4b50-9ad0-39a638643a19" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ee0300b0-ead3-4b50-9ad0-39a638643a19_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_ee0300b0-ead3-4b50-9ad0-39a638643a19" xlink:to="loc_dei_EntityDomain_ee0300b0-ead3-4b50-9ad0-39a638643a19_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_351e47ce-7ff3-47b1-97d5-7208b9a2193f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_ee0300b0-ead3-4b50-9ad0-39a638643a19" xlink:to="loc_dei_EntityDomain_351e47ce-7ff3-47b1-97d5-7208b9a2193f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_5001d1e7-db1d-4dd4-badd-35822e0d3170" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_351e47ce-7ff3-47b1-97d5-7208b9a2193f" xlink:to="loc_aal_AmericanAirlinesIncMember_5001d1e7-db1d-4dd4-badd-35822e0d3170" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangesInProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusOfPlanTableTextBlock_35cbcb1d-933f-416e-93fa-465f6e2267b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ChangesInProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusOfPlanTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d8674361-6544-4416-813c-5ae8fc66b75d" xlink:to="loc_us-gaap_ChangesInProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusOfPlanTableTextBlock_35cbcb1d-933f-416e-93fa-465f6e2267b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_4f409883-331d-435d-98b5-084aea938f15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d8674361-6544-4416-813c-5ae8fc66b75d" xlink:to="loc_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_4f409883-331d-435d-98b5-084aea938f15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock_1653197c-ffa9-4260-b385-62fdb9fe701c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d8674361-6544-4416-813c-5ae8fc66b75d" xlink:to="loc_us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock_1653197c-ffa9-4260-b385-62fdb9fe701c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock_4efa88b2-686e-4b45-8f73-6ba2ac43ab5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d8674361-6544-4416-813c-5ae8fc66b75d" xlink:to="loc_us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock_4efa88b2-686e-4b45-8f73-6ba2ac43ab5b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_382d31b3-f75f-444f-ae62-0422abf7fac6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfNetBenefitCostsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d8674361-6544-4416-813c-5ae8fc66b75d" xlink:to="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_382d31b3-f75f-444f-ae62-0422abf7fac6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_fac888fc-68d1-4da1-bb95-75c374f33c38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAssumptionsUsedTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d8674361-6544-4416-813c-5ae8fc66b75d" xlink:to="loc_us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_fac888fc-68d1-4da1-bb95-75c374f33c38" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_dbace20c-dced-487d-a5e6-f73b29fc9eb1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d8674361-6544-4416-813c-5ae8fc66b75d" xlink:to="loc_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_dbace20c-dced-487d-a5e6-f73b29fc9eb1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock_16e5af51-ea82-4a07-9801-bb9cfbe95145" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d8674361-6544-4416-813c-5ae8fc66b75d" xlink:to="loc_us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock_16e5af51-ea82-4a07-9801-bb9cfbe95145" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock_e73d8dba-aed3-4988-8b38-2e4d797a37e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_d8674361-6544-4416-813c-5ae8fc66b75d" xlink:to="loc_us-gaap_ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock_e73d8dba-aed3-4988-8b38-2e4d797a37e8" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/AccumulatedOtherComprehensiveLossTables" xlink:type="simple" xlink:href="aal-20251231.xsd#AccumulatedOtherComprehensiveLossTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/AccumulatedOtherComprehensiveLossTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_e448dff1-8bb0-4aa0-bb2b-10130b71abff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_d59870b7-284c-40f3-9b5c-7a9a8eebafc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_e448dff1-8bb0-4aa0-bb2b-10130b71abff" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_d59870b7-284c-40f3-9b5c-7a9a8eebafc7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_23823f3f-a6b9-4ce4-a062-6669b3b2a5cb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_d59870b7-284c-40f3-9b5c-7a9a8eebafc7" xlink:to="loc_dei_LegalEntityAxis_23823f3f-a6b9-4ce4-a062-6669b3b2a5cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_23823f3f-a6b9-4ce4-a062-6669b3b2a5cb_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_23823f3f-a6b9-4ce4-a062-6669b3b2a5cb" xlink:to="loc_dei_EntityDomain_23823f3f-a6b9-4ce4-a062-6669b3b2a5cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_5380a2cb-4fed-4742-afed-f693ab5760df" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_23823f3f-a6b9-4ce4-a062-6669b3b2a5cb" xlink:to="loc_dei_EntityDomain_5380a2cb-4fed-4742-afed-f693ab5760df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_aac35d9b-a8e2-4c72-89b3-61b653887a20" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_5380a2cb-4fed-4742-afed-f693ab5760df" xlink:to="loc_aal_AmericanAirlinesIncMember_aac35d9b-a8e2-4c72-89b3-61b653887a20" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_eaaefec9-f4cf-4fef-9c9e-f696efdf07af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_e448dff1-8bb0-4aa0-bb2b-10130b71abff" xlink:to="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_eaaefec9-f4cf-4fef-9c9e-f696efdf07af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_ad75a61a-dac8-4db2-a5e7-e6d64aecda9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_e448dff1-8bb0-4aa0-bb2b-10130b71abff" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_ad75a61a-dac8-4db2-a5e7-e6d64aecda9c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/CommitmentsContingenciesandGuaranteesTables" xlink:type="simple" xlink:href="aal-20251231.xsd#CommitmentsContingenciesandGuaranteesTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/CommitmentsContingenciesandGuaranteesTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aal_CommitmentsandContingenciesLineItems_38b25faa-9427-41b5-be05-9752c723bae8" xlink:href="aal-20251231.xsd#aal_CommitmentsandContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CommitmentsandContingenciesTable_1e6b939b-0b21-4cbb-8b70-b72f42c3ef79" xlink:href="aal-20251231.xsd#aal_CommitmentsandContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_aal_CommitmentsandContingenciesLineItems_38b25faa-9427-41b5-be05-9752c723bae8" xlink:to="loc_aal_CommitmentsandContingenciesTable_1e6b939b-0b21-4cbb-8b70-b72f42c3ef79" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_a9188be3-cb50-42f4-8610-5ec4c82ef482" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_CommitmentsandContingenciesTable_1e6b939b-0b21-4cbb-8b70-b72f42c3ef79" xlink:to="loc_dei_LegalEntityAxis_a9188be3-cb50-42f4-8610-5ec4c82ef482" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a9188be3-cb50-42f4-8610-5ec4c82ef482_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_a9188be3-cb50-42f4-8610-5ec4c82ef482" xlink:to="loc_dei_EntityDomain_a9188be3-cb50-42f4-8610-5ec4c82ef482_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_23844844-355d-40f3-ae62-113be34bdb59" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_a9188be3-cb50-42f4-8610-5ec4c82ef482" xlink:to="loc_dei_EntityDomain_23844844-355d-40f3-ae62-113be34bdb59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_ecbb5624-4a9b-4fc5-84e5-1883a8901257" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_23844844-355d-40f3-ae62-113be34bdb59" xlink:to="loc_aal_AmericanAirlinesIncMember_ecbb5624-4a9b-4fc5-84e5-1883a8901257" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentTextBlock_ec8314d0-ebf8-49cb-9a13-2999889dbe75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_CommitmentsandContingenciesLineItems_38b25faa-9427-41b5-be05-9752c723bae8" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentTextBlock_ec8314d0-ebf8-49cb-9a13-2999889dbe75" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationsDisclosureTextBlock_c700096f-1749-4e3f-988a-6d5a011ed65c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationsDisclosureTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_CommitmentsandContingenciesLineItems_38b25faa-9427-41b5-be05-9752c723bae8" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationsDisclosureTextBlock_c700096f-1749-4e3f-988a-6d5a011ed65c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SupplementalCashFlowInformationTables" xlink:type="simple" xlink:href="aal-20251231.xsd#SupplementalCashFlowInformationTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SupplementalCashFlowInformationTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_450ed495-cc4e-4754-9e12-eff2a2720a20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherSignificantNoncashTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionsTable_16ffe7f9-b1c9-4e8e-8906-650bca20212b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherSignificantNoncashTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_450ed495-cc4e-4754-9e12-eff2a2720a20" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionsTable_16ffe7f9-b1c9-4e8e-8906-650bca20212b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_757a348f-a08d-4ee8-ba81-b75e96f4e565" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsTable_16ffe7f9-b1c9-4e8e-8906-650bca20212b" xlink:to="loc_dei_LegalEntityAxis_757a348f-a08d-4ee8-ba81-b75e96f4e565" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_757a348f-a08d-4ee8-ba81-b75e96f4e565_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_757a348f-a08d-4ee8-ba81-b75e96f4e565" xlink:to="loc_dei_EntityDomain_757a348f-a08d-4ee8-ba81-b75e96f4e565_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_8bbbd3f3-3211-4340-bf0e-2bf761d23d68" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_757a348f-a08d-4ee8-ba81-b75e96f4e565" xlink:to="loc_dei_EntityDomain_8bbbd3f3-3211-4340-bf0e-2bf761d23d68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_26743e25-8550-4e63-b823-23c98259ca52" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_8bbbd3f3-3211-4340-bf0e-2bf761d23d68" xlink:to="loc_aal_AmericanAirlinesIncMember_26743e25-8550-4e63-b823-23c98259ca52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_1fc5b88a-4936-4f94-94f4-6ad42963e726" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_450ed495-cc4e-4754-9e12-eff2a2720a20" xlink:to="loc_us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_1fc5b88a-4936-4f94-94f4-6ad42963e726" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SharebasedCompensationTables" xlink:type="simple" xlink:href="aal-20251231.xsd#SharebasedCompensationTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SharebasedCompensationTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7e0fa5b0-3edc-45e3-bf01-a897b81f94b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f93991a9-8ca7-4913-98cf-f5d50a609952" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7e0fa5b0-3edc-45e3-bf01-a897b81f94b6" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f93991a9-8ca7-4913-98cf-f5d50a609952" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_b61a9856-9ac1-4c87-b483-fe44ca189224" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f93991a9-8ca7-4913-98cf-f5d50a609952" xlink:to="loc_dei_LegalEntityAxis_b61a9856-9ac1-4c87-b483-fe44ca189224" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b61a9856-9ac1-4c87-b483-fe44ca189224_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_b61a9856-9ac1-4c87-b483-fe44ca189224" xlink:to="loc_dei_EntityDomain_b61a9856-9ac1-4c87-b483-fe44ca189224_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_737b3969-0979-41fd-8235-89ae65cb32ce" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_b61a9856-9ac1-4c87-b483-fe44ca189224" xlink:to="loc_dei_EntityDomain_737b3969-0979-41fd-8235-89ae65cb32ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_1c283176-c91b-45c7-9d45-1c449b3897d3" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_737b3969-0979-41fd-8235-89ae65cb32ce" xlink:to="loc_aal_AmericanAirlinesIncMember_1c283176-c91b-45c7-9d45-1c449b3897d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_98d93833-cfc9-4504-96c9-7686ffb846f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7e0fa5b0-3edc-45e3-bf01-a897b81f94b6" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_98d93833-cfc9-4504-96c9-7686ffb846f1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ValuationandQualifyingAccountsTables" xlink:type="simple" xlink:href="aal-20251231.xsd#ValuationandQualifyingAccountsTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ValuationandQualifyingAccountsTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_76e1e646-9cd9-4b64-8ab2-941e317c116a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ValuationAndQualifyingAccountsDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_6aa10f3e-7873-4406-904c-5cb2f6b1fd9d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ValuationAndQualifyingAccountsDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_76e1e646-9cd9-4b64-8ab2-941e317c116a" xlink:to="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_6aa10f3e-7873-4406-904c-5cb2f6b1fd9d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_09cff416-ef78-4b5b-b2db-cdaa9e666a76" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_6aa10f3e-7873-4406-904c-5cb2f6b1fd9d" xlink:to="loc_dei_LegalEntityAxis_09cff416-ef78-4b5b-b2db-cdaa9e666a76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_09cff416-ef78-4b5b-b2db-cdaa9e666a76_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_09cff416-ef78-4b5b-b2db-cdaa9e666a76" xlink:to="loc_dei_EntityDomain_09cff416-ef78-4b5b-b2db-cdaa9e666a76_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_184ec134-24a8-4130-9aba-1a718df1abc2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_09cff416-ef78-4b5b-b2db-cdaa9e666a76" xlink:to="loc_dei_EntityDomain_184ec134-24a8-4130-9aba-1a718df1abc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_5419d8a5-cafb-4739-a584-77bdc1359f3a" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_184ec134-24a8-4130-9aba-1a718df1abc2" xlink:to="loc_aal_AmericanAirlinesIncMember_5419d8a5-cafb-4739-a584-77bdc1359f3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ScheduleOfValuationAndQualifyingAccountsTableTextBlock_ec77c11c-6438-401a-8cd6-755faa1ea137" xlink:href="aal-20251231.xsd#aal_ScheduleOfValuationAndQualifyingAccountsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_76e1e646-9cd9-4b64-8ab2-941e317c116a" xlink:to="loc_aal_ScheduleOfValuationAndQualifyingAccountsTableTextBlock_ec77c11c-6438-401a-8cd6-755faa1ea137" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/TransactionswithRelatedPartiesTables" xlink:type="simple" xlink:href="aal-20251231.xsd#TransactionswithRelatedPartiesTables"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/TransactionswithRelatedPartiesTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_6e835061-fd00-4d53-95d9-f703761b5ef0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c068004c-cef1-4f5b-88ef-5a7bf4a5f19a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_6e835061-fd00-4d53-95d9-f703761b5ef0" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c068004c-cef1-4f5b-88ef-5a7bf4a5f19a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_8bdfb2eb-b5cf-4b31-a3b5-a2f270b53991" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c068004c-cef1-4f5b-88ef-5a7bf4a5f19a" xlink:to="loc_dei_LegalEntityAxis_8bdfb2eb-b5cf-4b31-a3b5-a2f270b53991" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_8bdfb2eb-b5cf-4b31-a3b5-a2f270b53991_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_8bdfb2eb-b5cf-4b31-a3b5-a2f270b53991" xlink:to="loc_dei_EntityDomain_8bdfb2eb-b5cf-4b31-a3b5-a2f270b53991_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e3c231b3-b6a2-421d-a9b0-2dc0e503991c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_8bdfb2eb-b5cf-4b31-a3b5-a2f270b53991" xlink:to="loc_dei_EntityDomain_e3c231b3-b6a2-421d-a9b0-2dc0e503991c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_423f5955-de72-430d-a332-485080f287c4" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_e3c231b3-b6a2-421d-a9b0-2dc0e503991c" xlink:to="loc_aal_AmericanAirlinesIncMember_423f5955-de72-430d-a332-485080f287c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_5ecc987f-e3f4-4f76-81d3-5a1841fe3fd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_6e835061-fd00-4d53-95d9-f703761b5ef0" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_5ecc987f-e3f4-4f76-81d3-5a1841fe3fd8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnusualOrInfrequentItemLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnusualOrInfrequentItemTable_d7c3e386-8c6b-4578-9fb1-8bc36c636d9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnusualOrInfrequentItemTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_UnusualOrInfrequentItemTable_d7c3e386-8c6b-4578-9fb1-8bc36c636d9c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_73eb9cfb-30be-4b37-88ad-ffca2edfe6a9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnusualOrInfrequentItemTable_d7c3e386-8c6b-4578-9fb1-8bc36c636d9c" xlink:to="loc_srt_ProductOrServiceAxis_73eb9cfb-30be-4b37-88ad-ffca2edfe6a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_73eb9cfb-30be-4b37-88ad-ffca2edfe6a9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_73eb9cfb-30be-4b37-88ad-ffca2edfe6a9" xlink:to="loc_srt_ProductsAndServicesDomain_73eb9cfb-30be-4b37-88ad-ffca2edfe6a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_bdc20529-1fa5-49b6-9f3f-111a34dea118" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_73eb9cfb-30be-4b37-88ad-ffca2edfe6a9" xlink:to="loc_srt_ProductsAndServicesDomain_bdc20529-1fa5-49b6-9f3f-111a34dea118" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AirTrafficMember_fcfcbfe6-a0a8-4723-b918-5147626963ae" xlink:href="aal-20251231.xsd#aal_AirTrafficMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bdc20529-1fa5-49b6-9f3f-111a34dea118" xlink:to="loc_aal_AirTrafficMember_fcfcbfe6-a0a8-4723-b918-5147626963ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LoyaltyProgramMember_6979f244-acc5-4482-b190-1b161b4800d5" xlink:href="aal-20251231.xsd#aal_LoyaltyProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bdc20529-1fa5-49b6-9f3f-111a34dea118" xlink:to="loc_aal_LoyaltyProgramMember_6979f244-acc5-4482-b190-1b161b4800d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_7958105d-f9fc-4aba-ba82-ebf0bf93f16e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnusualOrInfrequentItemTable_d7c3e386-8c6b-4578-9fb1-8bc36c636d9c" xlink:to="loc_srt_RangeAxis_7958105d-f9fc-4aba-ba82-ebf0bf93f16e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_7958105d-f9fc-4aba-ba82-ebf0bf93f16e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_7958105d-f9fc-4aba-ba82-ebf0bf93f16e" xlink:to="loc_srt_RangeMember_7958105d-f9fc-4aba-ba82-ebf0bf93f16e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_fe210e2a-6b6e-4a5c-9def-a498e0ca449c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_7958105d-f9fc-4aba-ba82-ebf0bf93f16e" xlink:to="loc_srt_RangeMember_fe210e2a-6b6e-4a5c-9def-a498e0ca449c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_662bf349-8329-437f-a9d8-7bd7fbb0a646" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_fe210e2a-6b6e-4a5c-9def-a498e0ca449c" xlink:to="loc_srt_MinimumMember_662bf349-8329-437f-a9d8-7bd7fbb0a646" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e8126035-8995-43f2-ab32-056c48967ce1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_fe210e2a-6b6e-4a5c-9def-a498e0ca449c" xlink:to="loc_srt_MaximumMember_e8126035-8995-43f2-ab32-056c48967ce1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_204ac4bd-98f3-4ead-b2cb-88416f0322a3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnusualOrInfrequentItemTable_d7c3e386-8c6b-4578-9fb1-8bc36c636d9c" xlink:to="loc_dei_LegalEntityAxis_204ac4bd-98f3-4ead-b2cb-88416f0322a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_204ac4bd-98f3-4ead-b2cb-88416f0322a3_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_204ac4bd-98f3-4ead-b2cb-88416f0322a3" xlink:to="loc_dei_EntityDomain_204ac4bd-98f3-4ead-b2cb-88416f0322a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d04f7b12-83ab-4f4e-8761-d7bb129dc3f0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_204ac4bd-98f3-4ead-b2cb-88416f0322a3" xlink:to="loc_dei_EntityDomain_d04f7b12-83ab-4f4e-8761-d7bb129dc3f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_2e9430e7-0e48-470c-8aba-081c6eb39514" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_d04f7b12-83ab-4f4e-8761-d7bb129dc3f0" xlink:to="loc_aal_AmericanAirlinesIncMember_2e9430e7-0e48-470c-8aba-081c6eb39514" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_ca154361-d5ae-46e4-a850-765c60436d95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnusualOrInfrequentItemTable_d7c3e386-8c6b-4578-9fb1-8bc36c636d9c" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_ca154361-d5ae-46e4-a850-765c60436d95" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_ca154361-d5ae-46e4-a850-765c60436d95_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_ca154361-d5ae-46e4-a850-765c60436d95" xlink:to="loc_us-gaap_ReceivableTypeDomain_ca154361-d5ae-46e4-a850-765c60436d95_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_70cc9f6e-1d9e-4c9f-9a26-c2393ef57e14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_ca154361-d5ae-46e4-a850-765c60436d95" xlink:to="loc_us-gaap_ReceivableTypeDomain_70cc9f6e-1d9e-4c9f-9a26-c2393ef57e14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AccountReceivableFromBusinessPartnersMember_7477825e-e7b0-4e10-a714-e72ee2e55990" xlink:href="aal-20251231.xsd#aal_AccountReceivableFromBusinessPartnersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_70cc9f6e-1d9e-4c9f-9a26-c2393ef57e14" xlink:to="loc_aal_AccountReceivableFromBusinessPartnersMember_7477825e-e7b0-4e10-a714-e72ee2e55990" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AccountsReceivableFromTicketSalesMember_dcdde61d-981a-40e1-9c68-bd27e457fe38" xlink:href="aal-20251231.xsd#aal_AccountsReceivableFromTicketSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_70cc9f6e-1d9e-4c9f-9a26-c2393ef57e14" xlink:to="loc_aal_AccountsReceivableFromTicketSalesMember_dcdde61d-981a-40e1-9c68-bd27e457fe38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4a27fc39-33aa-4cb2-b504-86d1a91d27de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnusualOrInfrequentItemTable_d7c3e386-8c6b-4578-9fb1-8bc36c636d9c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4a27fc39-33aa-4cb2-b504-86d1a91d27de" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_4a27fc39-33aa-4cb2-b504-86d1a91d27de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4a27fc39-33aa-4cb2-b504-86d1a91d27de" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_4a27fc39-33aa-4cb2-b504-86d1a91d27de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f7b26eb9-7fc6-41c9-99cb-90a51f13dad5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_4a27fc39-33aa-4cb2-b504-86d1a91d27de" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f7b26eb9-7fc6-41c9-99cb-90a51f13dad5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingRelatedIntangibleAssetsMember_83e1f1f3-1d7f-4e3e-83aa-6068f854305d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketingRelatedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f7b26eb9-7fc6-41c9-99cb-90a51f13dad5" xlink:to="loc_us-gaap_MarketingRelatedIntangibleAssetsMember_83e1f1f3-1d7f-4e3e-83aa-6068f854305d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DomesticAirportSlotsAndAirportGateLeaseholdRightsMember_b9b1721f-2f51-426b-841d-e6d6400f963d" xlink:href="aal-20251231.xsd#aal_DomesticAirportSlotsAndAirportGateLeaseholdRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f7b26eb9-7fc6-41c9-99cb-90a51f13dad5" xlink:to="loc_aal_DomesticAirportSlotsAndAirportGateLeaseholdRightsMember_b9b1721f-2f51-426b-841d-e6d6400f963d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_abd403ed-1233-46da-a165-0bb7b0c0a036" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnusualOrInfrequentItemTable_d7c3e386-8c6b-4578-9fb1-8bc36c636d9c" xlink:to="loc_us-gaap_DebtInstrumentAxis_abd403ed-1233-46da-a165-0bb7b0c0a036" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_abd403ed-1233-46da-a165-0bb7b0c0a036_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_abd403ed-1233-46da-a165-0bb7b0c0a036" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_abd403ed-1233-46da-a165-0bb7b0c0a036_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_07c087e8-2441-4c41-93a5-8ee71fb97965" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_abd403ed-1233-46da-a165-0bb7b0c0a036" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_07c087e8-2441-4c41-93a5-8ee71fb97965" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FuelFinancingArrangementMember_fc6b6d08-24c6-47f1-80c7-df9eefbcbd0c" xlink:href="aal-20251231.xsd#aal_FuelFinancingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_07c087e8-2441-4c41-93a5-8ee71fb97965" xlink:to="loc_aal_FuelFinancingArrangementMember_fc6b6d08-24c6-47f1-80c7-df9eefbcbd0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019c2e9b-6983-73d5-8578-1524d76aec56" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnusualOrInfrequentItemTable_d7c3e386-8c6b-4578-9fb1-8bc36c636d9c" xlink:to="loc_srt_CounterpartyNameAxis_019c2e9b-6983-73d5-8578-1524d76aec56" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c2e9b-6983-73d5-8578-1524d76aec56_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019c2e9b-6983-73d5-8578-1524d76aec56" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c2e9b-6983-73d5-8578-1524d76aec56_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c2e9b-6983-7999-8714-97ad480aa934" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019c2e9b-6983-73d5-8578-1524d76aec56" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c2e9b-6983-7999-8714-97ad480aa934" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CitiMember_019c2e9b-8ef6-7552-986a-36c28bedf235" xlink:href="aal-20251231.xsd#aal_CitiMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c2e9b-6983-7999-8714-97ad480aa934" xlink:to="loc_aal_CitiMember_019c2e9b-8ef6-7552-986a-36c28bedf235" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_23160df5-7135-4ea9-9172-0a75809122c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_23160df5-7135-4ea9-9172-0a75809122c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ContractReceivablesSettlementDuration_c6a71973-2369-4420-962e-053551a2fc71" xlink:href="aal-20251231.xsd#aal_ContractReceivablesSettlementDuration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_aal_ContractReceivablesSettlementDuration_c6a71973-2369-4420-962e-053551a2fc71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportingUnits_967987f6-8ea2-44fb-b2d8-02846ae4f480" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfReportingUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_NumberOfReportingUnits_967987f6-8ea2-44fb-b2d8-02846ae4f480" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_e1134c32-49ad-4dac-a857-decd5f8136be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_e1134c32-49ad-4dac-a857-decd5f8136be" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_bdae06ae-1b19-4edd-8ef6-6bbbb1605844" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_Goodwill_bdae06ae-1b19-4edd-8ef6-6bbbb1605844" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_8ea71fe4-7422-4fba-a787-98927dfad7ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_8ea71fe4-7422-4fba-a787-98927dfad7ea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_91f5919a-3996-4b16-a4c0-c43c9246a50b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_91f5919a-3996-4b16-a4c0-c43c9246a50b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_c8ebe6a5-dbb3-48df-b530-588338f99b98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_c8ebe6a5-dbb3-48df-b530-588338f99b98" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_a3d2933b-9dcd-4ae8-80fe-61300c3313bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_a3d2933b-9dcd-4ae8-80fe-61300c3313bb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_4d0716eb-a20c-4e4a-99b7-a01584752cb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_4d0716eb-a20c-4e4a-99b7-a01584752cb8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_789b0dac-6c03-41d1-897a-da5d3ddee3a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_789b0dac-6c03-41d1-897a-da5d3ddee3a9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_019bb3f2-9e49-7eff-a445-3a50d3a86d9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_019bb3f2-9e49-7eff-a445-3a50d3a86d9e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_019bb3f3-b99c-7e9f-bbf7-df8874a2735b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_019bb3f3-b99c-7e9f-bbf7-df8874a2735b" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_83fca7eb-7b08-4394-83ef-0dd54a001082" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_83fca7eb-7b08-4394-83ef-0dd54a001082" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_cdb4e426-e081-4609-9dba-3265091c5027" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_cdb4e426-e081-4609-9dba-3265091c5027" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2b0da154-ba9a-4433-b242-2fc8c6ea58e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2b0da154-ba9a-4433-b242-2fc8c6ea58e5" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4782495e-c6fd-4ff6-b27f-4bd8418e958e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4782495e-c6fd-4ff6-b27f-4bd8418e958e" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBankLoansAndNotesPayable_019c6c6b-272a-7d01-8721-179a7557d95a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBankLoansAndNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_ShortTermBankLoansAndNotesPayable_019c6c6b-272a-7d01-8721-179a7557d95a" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_b6ca0ba1-7c2a-45ef-9709-b6beb346cb48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_InterestExpenseNonoperating_b6ca0ba1-7c2a-45ef-9709-b6beb346cb48" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RevenuePerformanceObligationTerm_5ee30ac0-5b5f-4111-b6f3-16d5d1b8a29b" xlink:href="aal-20251231.xsd#aal_RevenuePerformanceObligationTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_aal_RevenuePerformanceObligationTerm_5ee30ac0-5b5f-4111-b6f3-16d5d1b8a29b" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_0a4b5089-7512-4db2-aa4b-d0de5a111161" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuePerformanceObligationDescriptionOfTiming"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_0a4b5089-7512-4db2-aa4b-d0de5a111161" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RevenuePerformanceObligationPaymentTerm_77b459e9-ea71-4d13-aaeb-3ce76341a7e4" xlink:href="aal-20251231.xsd#aal_RevenuePerformanceObligationPaymentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_aal_RevenuePerformanceObligationPaymentTerm_77b459e9-ea71-4d13-aaeb-3ce76341a7e4" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_NumberOfRevenueComponents_596982d6-cc98-45c4-8dee-9a2f37c608f1" xlink:href="aal-20251231.xsd#aal_NumberOfRevenueComponents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_aal_NumberOfRevenueComponents_596982d6-cc98-45c4-8dee-9a2f37c608f1" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RevenueComponentTermOfAgreement_019c2e9a-a286-7efb-932c-7659cb175927" xlink:href="aal-20251231.xsd#aal_RevenueComponentTermOfAgreement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_aal_RevenueComponentTermOfAgreement_019c2e9a-a286-7efb-932c-7659cb175927" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_c0d38d8f-31c6-4a7c-88a4-6ebd303b38a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_c0d38d8f-31c6-4a7c-88a4-6ebd303b38a1" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingAndAdvertisingExpense_13b425a7-c693-4a97-91dd-7e1aa0ae7a53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketingAndAdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_MarketingAndAdvertisingExpense_13b425a7-c693-4a97-91dd-7e1aa0ae7a53" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_1dff141d-c5a3-4f21-8c52-1ccf18d6776c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCurrencyTransactionGainLossRealized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemLineItems_0eb40489-fe54-4fe0-a6c4-2432e82b478a" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_1dff141d-c5a3-4f21-8c52-1ccf18d6776c" xlink:type="arc" order="26"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesOperatingPropertyandEquipmentDetail" xlink:type="simple" xlink:href="aal-20251231.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesOperatingPropertyandEquipmentDetail"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesOperatingPropertyandEquipmentDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_031f833e-a4e4-4df6-b5ff-35c5fb45b023" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e9f34943-815f-4c12-932c-6285b65c12f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_031f833e-a4e4-4df6-b5ff-35c5fb45b023" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e9f34943-815f-4c12-932c-6285b65c12f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_41027897-8332-4c3f-b72e-fb158cf11aee" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e9f34943-815f-4c12-932c-6285b65c12f0" xlink:to="loc_dei_LegalEntityAxis_41027897-8332-4c3f-b72e-fb158cf11aee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_41027897-8332-4c3f-b72e-fb158cf11aee_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_41027897-8332-4c3f-b72e-fb158cf11aee" xlink:to="loc_dei_EntityDomain_41027897-8332-4c3f-b72e-fb158cf11aee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_71e8bd5b-b575-4866-a1b2-a9e7a5dfff1e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_41027897-8332-4c3f-b72e-fb158cf11aee" xlink:to="loc_dei_EntityDomain_71e8bd5b-b575-4866-a1b2-a9e7a5dfff1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_c136f26a-4211-40db-be12-a698ee98d882" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_71e8bd5b-b575-4866-a1b2-a9e7a5dfff1e" xlink:to="loc_aal_AmericanAirlinesIncMember_c136f26a-4211-40db-be12-a698ee98d882" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_9de9a445-fb0a-4be0-92d0-bb4d3af3d317" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e9f34943-815f-4c12-932c-6285b65c12f0" xlink:to="loc_srt_RangeAxis_9de9a445-fb0a-4be0-92d0-bb4d3af3d317" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9de9a445-fb0a-4be0-92d0-bb4d3af3d317_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_9de9a445-fb0a-4be0-92d0-bb4d3af3d317" xlink:to="loc_srt_RangeMember_9de9a445-fb0a-4be0-92d0-bb4d3af3d317_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f37a756d-2544-4ba9-a23f-93da3eaecfde" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_9de9a445-fb0a-4be0-92d0-bb4d3af3d317" xlink:to="loc_srt_RangeMember_f37a756d-2544-4ba9-a23f-93da3eaecfde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_bfac26da-3d4e-43dc-9e69-4f5dcc6164a2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f37a756d-2544-4ba9-a23f-93da3eaecfde" xlink:to="loc_srt_MinimumMember_bfac26da-3d4e-43dc-9e69-4f5dcc6164a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4410dfd9-cb12-47de-bb98-eb79f3841ae0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f37a756d-2544-4ba9-a23f-93da3eaecfde" xlink:to="loc_srt_MaximumMember_4410dfd9-cb12-47de-bb98-eb79f3841ae0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6882f036-7d6e-4b9a-a723-6fc8a433f10c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_e9f34943-815f-4c12-932c-6285b65c12f0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6882f036-7d6e-4b9a-a723-6fc8a433f10c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6882f036-7d6e-4b9a-a723-6fc8a433f10c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6882f036-7d6e-4b9a-a723-6fc8a433f10c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6882f036-7d6e-4b9a-a723-6fc8a433f10c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5f3ea642-86b8-4d32-8552-e23ee08354da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6882f036-7d6e-4b9a-a723-6fc8a433f10c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5f3ea642-86b8-4d32-8552-e23ee08354da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AircraftEnginesAndRelatedRotablePartsMember_765c2771-dcb2-4add-a128-bdfa13741f0c" xlink:href="aal-20251231.xsd#aal_AircraftEnginesAndRelatedRotablePartsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5f3ea642-86b8-4d32-8552-e23ee08354da" xlink:to="loc_aal_AircraftEnginesAndRelatedRotablePartsMember_765c2771-dcb2-4add-a128-bdfa13741f0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_063add23-ceca-47b5-a3a5-bf79ca015b9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5f3ea642-86b8-4d32-8552-e23ee08354da" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_063add23-ceca-47b5-a3a5-bf79ca015b9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_d6e28e03-fef3-4076-a5ba-07e1eee62b22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5f3ea642-86b8-4d32-8552-e23ee08354da" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_d6e28e03-fef3-4076-a5ba-07e1eee62b22" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CapitalizedSoftwareMember_11f5f5ad-e592-4589-8f91-a497da65d0ea" xlink:href="aal-20251231.xsd#aal_CapitalizedSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5f3ea642-86b8-4d32-8552-e23ee08354da" xlink:to="loc_aal_CapitalizedSoftwareMember_11f5f5ad-e592-4589-8f91-a497da65d0ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PropertyPlantAndEquipmentExtendedUsefulLife_019ba4a0-613d-754b-b9eb-35c8567d488c" xlink:href="aal-20251231.xsd#aal_PropertyPlantAndEquipmentExtendedUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_031f833e-a4e4-4df6-b5ff-35c5fb45b023" xlink:to="loc_aal_PropertyPlantAndEquipmentExtendedUsefulLife_019ba4a0-613d-754b-b9eb-35c8567d488c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage_d59ac6d2-c150-4e63-b539-1028d5cccc0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_031f833e-a4e4-4df6-b5ff-35c5fb45b023" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage_d59ac6d2-c150-4e63-b539-1028d5cccc0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_e85e64d5-2e9a-483a-ab2e-c66e8a776563" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_031f833e-a4e4-4df6-b5ff-35c5fb45b023" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_e85e64d5-2e9a-483a-ab2e-c66e8a776563" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_e2faa868-4b7d-4a3c-a844-bc5c2f45f8f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_031f833e-a4e4-4df6-b5ff-35c5fb45b023" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_e2faa868-4b7d-4a3c-a844-bc5c2f45f8f2" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesSignificantCategoriesofReportedOperatingRevenuesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesSignificantCategoriesofReportedOperatingRevenuesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesSignificantCategoriesofReportedOperatingRevenuesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_5c4da999-365b-4f64-8812-691b99e3e247" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_964b8b2f-56f4-4723-9233-907cfe2f9fdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_5c4da999-365b-4f64-8812-691b99e3e247" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_964b8b2f-56f4-4723-9233-907cfe2f9fdf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_ccc64149-5a8c-415f-8125-f82615402767" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_964b8b2f-56f4-4723-9233-907cfe2f9fdf" xlink:to="loc_dei_LegalEntityAxis_ccc64149-5a8c-415f-8125-f82615402767" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ccc64149-5a8c-415f-8125-f82615402767_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_ccc64149-5a8c-415f-8125-f82615402767" xlink:to="loc_dei_EntityDomain_ccc64149-5a8c-415f-8125-f82615402767_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a5905868-655b-4499-9765-1de6e8db0edf" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_ccc64149-5a8c-415f-8125-f82615402767" xlink:to="loc_dei_EntityDomain_a5905868-655b-4499-9765-1de6e8db0edf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_45fcc114-27c7-4e32-9630-cb9edbd82d9f" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_a5905868-655b-4499-9765-1de6e8db0edf" xlink:to="loc_aal_AmericanAirlinesIncMember_45fcc114-27c7-4e32-9630-cb9edbd82d9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_5e35e160-4208-4dcf-86b0-05bc180cc9b5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_964b8b2f-56f4-4723-9233-907cfe2f9fdf" xlink:to="loc_srt_ProductOrServiceAxis_5e35e160-4208-4dcf-86b0-05bc180cc9b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_5e35e160-4208-4dcf-86b0-05bc180cc9b5_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_5e35e160-4208-4dcf-86b0-05bc180cc9b5" xlink:to="loc_srt_ProductsAndServicesDomain_5e35e160-4208-4dcf-86b0-05bc180cc9b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_064a3e7f-97c2-4fcd-be72-a177e07d39ba" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_5e35e160-4208-4dcf-86b0-05bc180cc9b5" xlink:to="loc_srt_ProductsAndServicesDomain_064a3e7f-97c2-4fcd-be72-a177e07d39ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PassengerMember_b35e1106-5596-43ce-bec9-8a5189ea222e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PassengerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_064a3e7f-97c2-4fcd-be72-a177e07d39ba" xlink:to="loc_us-gaap_PassengerMember_b35e1106-5596-43ce-bec9-8a5189ea222e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PassengerTravelMember_cb90a84e-4791-43a9-b42a-1bb7af6b9ac5" xlink:href="aal-20251231.xsd#aal_PassengerTravelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PassengerMember_b35e1106-5596-43ce-bec9-8a5189ea222e" xlink:to="loc_aal_PassengerTravelMember_cb90a84e-4791-43a9-b42a-1bb7af6b9ac5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LoyaltyProgramTravelRedemptionsMember_44c88859-9008-46e0-90ab-8461f7f81d80" xlink:href="aal-20251231.xsd#aal_LoyaltyProgramTravelRedemptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PassengerMember_b35e1106-5596-43ce-bec9-8a5189ea222e" xlink:to="loc_aal_LoyaltyProgramTravelRedemptionsMember_44c88859-9008-46e0-90ab-8461f7f81d80" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CargoAndFreightMember_377325a6-7a1f-472e-b7f8-6869ea60ce3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CargoAndFreightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_064a3e7f-97c2-4fcd-be72-a177e07d39ba" xlink:to="loc_us-gaap_CargoAndFreightMember_377325a6-7a1f-472e-b7f8-6869ea60ce3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductAndServiceOtherMember_fe6512b8-74d2-4da8-ae64-205f2e14ef2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProductAndServiceOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_064a3e7f-97c2-4fcd-be72-a177e07d39ba" xlink:to="loc_us-gaap_ProductAndServiceOtherMember_fe6512b8-74d2-4da8-ae64-205f2e14ef2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LoyaltyProgramMarketingServicesMember_11211563-f8ac-451f-a348-c1f3dce7e700" xlink:href="aal-20251231.xsd#aal_LoyaltyProgramMarketingServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductAndServiceOtherMember_fe6512b8-74d2-4da8-ae64-205f2e14ef2a" xlink:to="loc_aal_LoyaltyProgramMarketingServicesMember_11211563-f8ac-451f-a348-c1f3dce7e700" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OtherRevenueMember_6458108e-d6de-446a-a008-fee29c1e135f" xlink:href="aal-20251231.xsd#aal_OtherRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductAndServiceOtherMember_fe6512b8-74d2-4da8-ae64-205f2e14ef2a" xlink:to="loc_aal_OtherRevenueMember_6458108e-d6de-446a-a008-fee29c1e135f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_09e90dad-914e-4d84-aa85-b90a9ce1feb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_5c4da999-365b-4f64-8812-691b99e3e247" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_09e90dad-914e-4d84-aa85-b90a9ce1feb4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesFuelFinancingObligationRollforwardDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesFuelFinancingObligationRollforwardDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesFuelFinancingObligationRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtLineItems_019c6c75-0fc6-7a9f-877b-7d76c04762d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShortTermDebtTable_019c6c75-0fc6-7345-9507-166bc28c2088" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShortTermDebtTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019c6c75-0fc6-7a9f-877b-7d76c04762d5" xlink:to="loc_us-gaap_ScheduleOfShortTermDebtTable_019c6c75-0fc6-7345-9507-166bc28c2088" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c6c75-0fc6-760c-be6e-35484d3586fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_019c6c75-0fc6-7345-9507-166bc28c2088" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c6c75-0fc6-760c-be6e-35484d3586fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6c75-0fc6-760c-be6e-35484d3586fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6c75-0fc6-760c-be6e-35484d3586fb" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6c75-0fc6-760c-be6e-35484d3586fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6c75-0fc6-73af-923a-5cad654f4e68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6c75-0fc6-760c-be6e-35484d3586fb" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6c75-0fc6-73af-923a-5cad654f4e68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FuelFinancingArrangementMember_019c6c75-0fc6-7d62-a033-600a3760ba57" xlink:href="aal-20251231.xsd#aal_FuelFinancingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c6c75-0fc6-73af-923a-5cad654f4e68" xlink:to="loc_aal_FuelFinancingArrangementMember_019c6c75-0fc6-7d62-a033-600a3760ba57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c6c75-0fc6-71e2-93f4-22ebd88fe297" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_019c6c75-0fc6-7345-9507-166bc28c2088" xlink:to="loc_dei_LegalEntityAxis_019c6c75-0fc6-71e2-93f4-22ebd88fe297" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c6c75-0fc6-71e2-93f4-22ebd88fe297_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c6c75-0fc6-71e2-93f4-22ebd88fe297" xlink:to="loc_dei_EntityDomain_019c6c75-0fc6-71e2-93f4-22ebd88fe297_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c6c75-0fc6-7437-b749-753953cc46d9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c6c75-0fc6-71e2-93f4-22ebd88fe297" xlink:to="loc_dei_EntityDomain_019c6c75-0fc6-7437-b749-753953cc46d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_019c6c75-0fc6-78fe-a537-684816018f24" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c6c75-0fc6-7437-b749-753953cc46d9" xlink:to="loc_aal_AmericanAirlinesIncMember_019c6c75-0fc6-78fe-a537-684816018f24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ShortTermBankLoansAndNotesPayableRollForward_019c6c75-afb3-766e-8bfd-5f77e4bf2c30" xlink:href="aal-20251231.xsd#aal_ShortTermBankLoansAndNotesPayableRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019c6c75-0fc6-7a9f-877b-7d76c04762d5" xlink:to="loc_aal_ShortTermBankLoansAndNotesPayableRollForward_019c6c75-afb3-766e-8bfd-5f77e4bf2c30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBankLoansAndNotesPayable_019c6c75-0fc6-7a1b-904e-88266494f5b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBankLoansAndNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_ShortTermBankLoansAndNotesPayableRollForward_019c6c75-afb3-766e-8bfd-5f77e4bf2c30" xlink:to="loc_us-gaap_ShortTermBankLoansAndNotesPayable_019c6c75-0fc6-7a1b-904e-88266494f5b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromBankDebt_019c6e20-777d-7afa-8b3c-cabcfa3de054" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromBankDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_ShortTermBankLoansAndNotesPayableRollForward_019c6c75-afb3-766e-8bfd-5f77e4bf2c30" xlink:to="loc_us-gaap_ProceedsFromBankDebt_019c6e20-777d-7afa-8b3c-cabcfa3de054" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfBankDebt_019c6e20-777d-77fd-9078-b2efb9f63fc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfBankDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_ShortTermBankLoansAndNotesPayableRollForward_019c6c75-afb3-766e-8bfd-5f77e4bf2c30" xlink:to="loc_us-gaap_RepaymentsOfBankDebt_019c6e20-777d-77fd-9078-b2efb9f63fc4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBankLoansAndNotesPayable_019c6c75-f411-75ef-aac2-d514b8e974f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBankLoansAndNotesPayable"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesPassengerRevenuebyGeographicRegionDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesPassengerRevenuebyGeographicRegionDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesPassengerRevenuebyGeographicRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineDestinationDisclosureLineItems_c3eb4ac4-5f7f-444b-9478-493660502f20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineDestinationDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineDestinationTable_a8b60a3a-e52f-476d-92d0-50dd96768dc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineDestinationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AirlineDestinationDisclosureLineItems_c3eb4ac4-5f7f-444b-9478-493660502f20" xlink:to="loc_us-gaap_AirlineDestinationTable_a8b60a3a-e52f-476d-92d0-50dd96768dc1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_ae9d084a-c6f5-406b-8b63-d5165c0d9c61" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AirlineDestinationTable_a8b60a3a-e52f-476d-92d0-50dd96768dc1" xlink:to="loc_dei_LegalEntityAxis_ae9d084a-c6f5-406b-8b63-d5165c0d9c61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ae9d084a-c6f5-406b-8b63-d5165c0d9c61_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_ae9d084a-c6f5-406b-8b63-d5165c0d9c61" xlink:to="loc_dei_EntityDomain_ae9d084a-c6f5-406b-8b63-d5165c0d9c61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ff191ab6-6cd3-4e48-baec-bf70c9fecd6e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_ae9d084a-c6f5-406b-8b63-d5165c0d9c61" xlink:to="loc_dei_EntityDomain_ff191ab6-6cd3-4e48-baec-bf70c9fecd6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_f9f4b558-ac48-4078-bd87-0007ab923e49" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_ff191ab6-6cd3-4e48-baec-bf70c9fecd6e" xlink:to="loc_aal_AmericanAirlinesIncMember_f9f4b558-ac48-4078-bd87-0007ab923e49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_e970d82c-4e2e-423c-a924-5cbc42a0548c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AirlineDestinationTable_a8b60a3a-e52f-476d-92d0-50dd96768dc1" xlink:to="loc_srt_ProductOrServiceAxis_e970d82c-4e2e-423c-a924-5cbc42a0548c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e970d82c-4e2e-423c-a924-5cbc42a0548c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_e970d82c-4e2e-423c-a924-5cbc42a0548c" xlink:to="loc_srt_ProductsAndServicesDomain_e970d82c-4e2e-423c-a924-5cbc42a0548c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_ef23546d-f24b-44be-8639-163371b7beff" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_e970d82c-4e2e-423c-a924-5cbc42a0548c" xlink:to="loc_srt_ProductsAndServicesDomain_ef23546d-f24b-44be-8639-163371b7beff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PassengerMember_a54029d6-f19e-419e-abb0-026aee6d1342" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PassengerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_ef23546d-f24b-44be-8639-163371b7beff" xlink:to="loc_us-gaap_PassengerMember_a54029d6-f19e-419e-abb0-026aee6d1342" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineDestinationsAxis_4b920a65-6513-4be4-9545-43f78c46a495" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineDestinationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AirlineDestinationTable_a8b60a3a-e52f-476d-92d0-50dd96768dc1" xlink:to="loc_us-gaap_AirlineDestinationsAxis_4b920a65-6513-4be4-9545-43f78c46a495" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineDestinationDomain_4b920a65-6513-4be4-9545-43f78c46a495_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineDestinationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AirlineDestinationsAxis_4b920a65-6513-4be4-9545-43f78c46a495" xlink:to="loc_us-gaap_AirlineDestinationDomain_4b920a65-6513-4be4-9545-43f78c46a495_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineDestinationDomain_3f4be2e2-4c5a-44c4-a548-2284c598f495" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineDestinationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AirlineDestinationsAxis_4b920a65-6513-4be4-9545-43f78c46a495" xlink:to="loc_us-gaap_AirlineDestinationDomain_3f4be2e2-4c5a-44c4-a548-2284c598f495" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticDestinationMember_e4755606-4dae-40aa-bda0-620f9973662e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DomesticDestinationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AirlineDestinationDomain_3f4be2e2-4c5a-44c4-a548-2284c598f495" xlink:to="loc_us-gaap_DomesticDestinationMember_e4755606-4dae-40aa-bda0-620f9973662e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LatinAmericaDestinationMember_eae0942c-ade5-4645-b217-a03f96c993b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LatinAmericaDestinationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AirlineDestinationDomain_3f4be2e2-4c5a-44c4-a548-2284c598f495" xlink:to="loc_us-gaap_LatinAmericaDestinationMember_eae0942c-ade5-4645-b217-a03f96c993b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AtlanticDestinationMember_e523ccd3-c8b9-41cd-a25a-4569953c9136" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AtlanticDestinationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AirlineDestinationDomain_3f4be2e2-4c5a-44c4-a548-2284c598f495" xlink:to="loc_us-gaap_AtlanticDestinationMember_e523ccd3-c8b9-41cd-a25a-4569953c9136" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PacificDestinationMember_9375d064-a612-4bf7-a433-b27163afc019" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PacificDestinationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AirlineDestinationDomain_3f4be2e2-4c5a-44c4-a548-2284c598f495" xlink:to="loc_us-gaap_PacificDestinationMember_9375d064-a612-4bf7-a433-b27163afc019" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_6c71156d-d86b-4f77-9207-e824e41bf26d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AirlineDestinationDisclosureLineItems_c3eb4ac4-5f7f-444b-9478-493660502f20" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_6c71156d-d86b-4f77-9207-e824e41bf26d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesSignificantContractLiabilitiesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesSignificantContractLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesSignificantContractLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_6e423175-8d9c-47c7-9f91-662b31271921" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_50ef522a-31cf-46a5-a8cc-2d75f1c776a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_6e423175-8d9c-47c7-9f91-662b31271921" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_50ef522a-31cf-46a5-a8cc-2d75f1c776a1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_2913ab0c-8f7e-4ee8-b4bc-7c1409eb0c4c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_50ef522a-31cf-46a5-a8cc-2d75f1c776a1" xlink:to="loc_dei_LegalEntityAxis_2913ab0c-8f7e-4ee8-b4bc-7c1409eb0c4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_2913ab0c-8f7e-4ee8-b4bc-7c1409eb0c4c_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_2913ab0c-8f7e-4ee8-b4bc-7c1409eb0c4c" xlink:to="loc_dei_EntityDomain_2913ab0c-8f7e-4ee8-b4bc-7c1409eb0c4c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6f9156d6-fc4c-44ff-9739-2d4aa599bb01" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_2913ab0c-8f7e-4ee8-b4bc-7c1409eb0c4c" xlink:to="loc_dei_EntityDomain_6f9156d6-fc4c-44ff-9739-2d4aa599bb01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_0b4d6899-aac6-49d2-ac83-fc782249871c" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6f9156d6-fc4c-44ff-9739-2d4aa599bb01" xlink:to="loc_aal_AmericanAirlinesIncMember_0b4d6899-aac6-49d2-ac83-fc782249871c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_df7b2170-8eb8-4919-84a9-20b7e1a7e8e4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_50ef522a-31cf-46a5-a8cc-2d75f1c776a1" xlink:to="loc_srt_ProductOrServiceAxis_df7b2170-8eb8-4919-84a9-20b7e1a7e8e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_df7b2170-8eb8-4919-84a9-20b7e1a7e8e4_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_df7b2170-8eb8-4919-84a9-20b7e1a7e8e4" xlink:to="loc_srt_ProductsAndServicesDomain_df7b2170-8eb8-4919-84a9-20b7e1a7e8e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_b76b1564-88df-48fc-a9b6-13350da331cb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_df7b2170-8eb8-4919-84a9-20b7e1a7e8e4" xlink:to="loc_srt_ProductsAndServicesDomain_b76b1564-88df-48fc-a9b6-13350da331cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LoyaltyProgramMember_4855d24c-8493-420a-9034-a3a12fae0412" xlink:href="aal-20251231.xsd#aal_LoyaltyProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b76b1564-88df-48fc-a9b6-13350da331cb" xlink:to="loc_aal_LoyaltyProgramMember_4855d24c-8493-420a-9034-a3a12fae0412" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AirTrafficMember_b12caf56-f23e-4bda-b5bd-ab03be70cb40" xlink:href="aal-20251231.xsd#aal_AirTrafficMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b76b1564-88df-48fc-a9b6-13350da331cb" xlink:to="loc_aal_AirTrafficMember_b12caf56-f23e-4bda-b5bd-ab03be70cb40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_391fc2bf-9759-4a09-a6e2-1157c2d5d7db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_6e423175-8d9c-47c7-9f91-662b31271921" xlink:to="loc_us-gaap_ContractWithCustomerLiability_391fc2bf-9759-4a09-a6e2-1157c2d5d7db" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesChangesinLoyaltyProgramLiabilityDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesChangesinLoyaltyProgramLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesChangesinLoyaltyProgramLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_68891768-3cbb-42a2-a608-0e4949fdebcc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_cf8a5726-6209-4994-a675-84c9f1666807" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_68891768-3cbb-42a2-a608-0e4949fdebcc" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_cf8a5726-6209-4994-a675-84c9f1666807" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_2338e9e7-2bb6-4cb3-bb20-f1b35b1b3e21" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_cf8a5726-6209-4994-a675-84c9f1666807" xlink:to="loc_dei_LegalEntityAxis_2338e9e7-2bb6-4cb3-bb20-f1b35b1b3e21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_2338e9e7-2bb6-4cb3-bb20-f1b35b1b3e21_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_2338e9e7-2bb6-4cb3-bb20-f1b35b1b3e21" xlink:to="loc_dei_EntityDomain_2338e9e7-2bb6-4cb3-bb20-f1b35b1b3e21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d7500160-ad87-4905-acc5-892a38cfa1d0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_2338e9e7-2bb6-4cb3-bb20-f1b35b1b3e21" xlink:to="loc_dei_EntityDomain_d7500160-ad87-4905-acc5-892a38cfa1d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_9f31b49a-b0f6-4112-9b52-12df2d315348" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_d7500160-ad87-4905-acc5-892a38cfa1d0" xlink:to="loc_aal_AmericanAirlinesIncMember_9f31b49a-b0f6-4112-9b52-12df2d315348" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_7c33883e-7b6b-43ff-9b8c-bc402864e3e6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_cf8a5726-6209-4994-a675-84c9f1666807" xlink:to="loc_srt_ProductOrServiceAxis_7c33883e-7b6b-43ff-9b8c-bc402864e3e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7c33883e-7b6b-43ff-9b8c-bc402864e3e6_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_7c33883e-7b6b-43ff-9b8c-bc402864e3e6" xlink:to="loc_srt_ProductsAndServicesDomain_7c33883e-7b6b-43ff-9b8c-bc402864e3e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_87b52271-b942-45de-8bf1-e96ead36c0f6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_7c33883e-7b6b-43ff-9b8c-bc402864e3e6" xlink:to="loc_srt_ProductsAndServicesDomain_87b52271-b942-45de-8bf1-e96ead36c0f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LoyaltyProgramMember_2d983369-65cb-4b64-ada4-6a8de9be3591" xlink:href="aal-20251231.xsd#aal_LoyaltyProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_87b52271-b942-45de-8bf1-e96ead36c0f6" xlink:to="loc_aal_LoyaltyProgramMember_2d983369-65cb-4b64-ada4-6a8de9be3591" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_MovementInContractWithCustomerLiabilityRollForward_2913a41d-69a7-4cef-a63b-5942eeec0e56" xlink:href="aal-20251231.xsd#aal_MovementInContractWithCustomerLiabilityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_68891768-3cbb-42a2-a608-0e4949fdebcc" xlink:to="loc_aal_MovementInContractWithCustomerLiabilityRollForward_2913a41d-69a7-4cef-a63b-5942eeec0e56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_230b7552-6819-4a8b-96d2-75af116ed377" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_MovementInContractWithCustomerLiabilityRollForward_2913a41d-69a7-4cef-a63b-5942eeec0e56" xlink:to="loc_us-gaap_ContractWithCustomerLiability_230b7552-6819-4a8b-96d2-75af116ed377" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ContractwithCustomerLiabilityIncreasefromDeferralOfRevenue_17043205-fa2a-451f-b845-b6d7e84edc00" xlink:href="aal-20251231.xsd#aal_ContractwithCustomerLiabilityIncreasefromDeferralOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_MovementInContractWithCustomerLiabilityRollForward_2913a41d-69a7-4cef-a63b-5942eeec0e56" xlink:to="loc_aal_ContractwithCustomerLiabilityIncreasefromDeferralOfRevenue_17043205-fa2a-451f-b845-b6d7e84edc00" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_86aacc37-a865-49f9-921d-0534d418d8e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_MovementInContractWithCustomerLiabilityRollForward_2913a41d-69a7-4cef-a63b-5942eeec0e56" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_86aacc37-a865-49f9-921d-0534d418d8e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_a61e7995-ff52-4268-8dd8-f95d243c41ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InactivePeriodBeforeExpirationOfMileageCredits_43c7edfa-e7c0-4245-84cd-86c2250aa108" xlink:href="aal-20251231.xsd#aal_InactivePeriodBeforeExpirationOfMileageCredits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_68891768-3cbb-42a2-a608-0e4949fdebcc" xlink:to="loc_aal_InactivePeriodBeforeExpirationOfMileageCredits_43c7edfa-e7c0-4245-84cd-86c2250aa108" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_337d1bde-0d76-4ef8-841e-472282e856bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_68891768-3cbb-42a2-a608-0e4949fdebcc" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_337d1bde-0d76-4ef8-841e-472282e856bc" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesRegionalExpensesDetail" xlink:type="simple" xlink:href="aal-20251231.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesRegionalExpensesDetail"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesRegionalExpensesDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aal_RegionalExpensesLineItems_0f3d8b6f-1ea0-4a26-ac4e-2d37892221eb" xlink:href="aal-20251231.xsd#aal_RegionalExpensesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RegionalExpensesTable_e095c2f8-c653-474e-aee4-952bd1af7525" xlink:href="aal-20251231.xsd#aal_RegionalExpensesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_aal_RegionalExpensesLineItems_0f3d8b6f-1ea0-4a26-ac4e-2d37892221eb" xlink:to="loc_aal_RegionalExpensesTable_e095c2f8-c653-474e-aee4-952bd1af7525" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_0aa73e39-d3cf-4711-801a-c3468e79fac0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_RegionalExpensesTable_e095c2f8-c653-474e-aee4-952bd1af7525" xlink:to="loc_dei_LegalEntityAxis_0aa73e39-d3cf-4711-801a-c3468e79fac0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_0aa73e39-d3cf-4711-801a-c3468e79fac0_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_0aa73e39-d3cf-4711-801a-c3468e79fac0" xlink:to="loc_dei_EntityDomain_0aa73e39-d3cf-4711-801a-c3468e79fac0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3b34f0cf-3199-4788-9a8c-4bde7904bf9a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_0aa73e39-d3cf-4711-801a-c3468e79fac0" xlink:to="loc_dei_EntityDomain_3b34f0cf-3199-4788-9a8c-4bde7904bf9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_9894f16f-5ffb-4e3e-8536-76b57a26bbcc" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_3b34f0cf-3199-4788-9a8c-4bde7904bf9a" xlink:to="loc_aal_AmericanAirlinesIncMember_9894f16f-5ffb-4e3e-8536-76b57a26bbcc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_bb2e5568-d26e-4733-bd26-baa856b8b081" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_RegionalExpensesTable_e095c2f8-c653-474e-aee4-952bd1af7525" xlink:to="loc_srt_ProductOrServiceAxis_bb2e5568-d26e-4733-bd26-baa856b8b081" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_bb2e5568-d26e-4733-bd26-baa856b8b081_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_bb2e5568-d26e-4733-bd26-baa856b8b081" xlink:to="loc_srt_ProductsAndServicesDomain_bb2e5568-d26e-4733-bd26-baa856b8b081_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_989a8557-3505-4e6b-8094-79ce4c7cb3c6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_bb2e5568-d26e-4733-bd26-baa856b8b081" xlink:to="loc_srt_ProductsAndServicesDomain_989a8557-3505-4e6b-8094-79ce4c7cb3c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegionalCarrierMember_de2db501-1ef5-47a4-8cbc-cfa2a5a1e51b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RegionalCarrierMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_989a8557-3505-4e6b-8094-79ce4c7cb3c6" xlink:to="loc_us-gaap_RegionalCarrierMember_de2db501-1ef5-47a4-8cbc-cfa2a5a1e51b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_aa712dff-27fd-45d9-96a0-847b2d973b56" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_RegionalExpensesTable_e095c2f8-c653-474e-aee4-952bd1af7525" xlink:to="loc_srt_CounterpartyNameAxis_aa712dff-27fd-45d9-96a0-847b2d973b56" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_aa712dff-27fd-45d9-96a0-847b2d973b56_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_aa712dff-27fd-45d9-96a0-847b2d973b56" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_aa712dff-27fd-45d9-96a0-847b2d973b56_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3cdadde7-790c-4a1d-8b44-1ac6d679b806" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_aa712dff-27fd-45d9-96a0-847b2d973b56" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3cdadde7-790c-4a1d-8b44-1ac6d679b806" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RepublicAirlineIncMember_bd352ae1-bc2f-4ff4-942f-17e841994a01" xlink:href="aal-20251231.xsd#aal_RepublicAirlineIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3cdadde7-790c-4a1d-8b44-1ac6d679b806" xlink:to="loc_aal_RepublicAirlineIncMember_bd352ae1-bc2f-4ff4-942f-17e841994a01" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aed58f6d-6e02-4910-ad71-b5aa8e39bdfe" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_RegionalExpensesTable_e095c2f8-c653-474e-aee4-952bd1af7525" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aed58f6d-6e02-4910-ad71-b5aa8e39bdfe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_aed58f6d-6e02-4910-ad71-b5aa8e39bdfe_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aed58f6d-6e02-4910-ad71-b5aa8e39bdfe" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_aed58f6d-6e02-4910-ad71-b5aa8e39bdfe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_ca826724-0600-4529-ab24-66857f961d14" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aed58f6d-6e02-4910-ad71-b5aa8e39bdfe" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_ca826724-0600-4529-ab24-66857f961d14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RepublicAirwaysHoldingsInc.Member_67f09361-856d-41c1-aaa8-6f0c642e5774" xlink:href="aal-20251231.xsd#aal_RepublicAirwaysHoldingsInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_ca826724-0600-4529-ab24-66857f961d14" xlink:to="loc_aal_RepublicAirwaysHoldingsInc.Member_67f09361-856d-41c1-aaa8-6f0c642e5774" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_7e51dc24-034a-40a5-9072-1fac604a5a60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_RegionalExpensesLineItems_0f3d8b6f-1ea0-4a26-ac4e-2d37892221eb" xlink:to="loc_us-gaap_DepreciationAndAmortization_7e51dc24-034a-40a5-9072-1fac604a5a60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AircraftRental_76048b7e-b95b-46e8-b685-1fb2a6e50992" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AircraftRental"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_RegionalExpensesLineItems_0f3d8b6f-1ea0-4a26-ac4e-2d37892221eb" xlink:to="loc_us-gaap_AircraftRental_76048b7e-b95b-46e8-b685-1fb2a6e50992" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineCapacityPurchaseArrangements_633d2cd4-b360-4b7d-90e9-c888e0b5721f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineCapacityPurchaseArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_RegionalExpensesLineItems_0f3d8b6f-1ea0-4a26-ac4e-2d37892221eb" xlink:to="loc_us-gaap_AirlineCapacityPurchaseArrangements_633d2cd4-b360-4b7d-90e9-c888e0b5721f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_c97dcfca-85db-4039-9977-a6fd547a5ed4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_RegionalExpensesLineItems_0f3d8b6f-1ea0-4a26-ac4e-2d37892221eb" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_c97dcfca-85db-4039-9977-a6fd547a5ed4" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SpecialItemsNetDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#SpecialItemsNetDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SpecialItemsNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_88d6155a-3e6b-4aa6-ba0e-b0bc051c0250" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_88d6155a-3e6b-4aa6-ba0e-b0bc051c0250" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_bcf728fe-f8c2-40e9-a6d3-3d542aef3d6e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_88d6155a-3e6b-4aa6-ba0e-b0bc051c0250" xlink:to="loc_dei_LegalEntityAxis_bcf728fe-f8c2-40e9-a6d3-3d542aef3d6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bcf728fe-f8c2-40e9-a6d3-3d542aef3d6e_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_bcf728fe-f8c2-40e9-a6d3-3d542aef3d6e" xlink:to="loc_dei_EntityDomain_bcf728fe-f8c2-40e9-a6d3-3d542aef3d6e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_569725cd-bbce-4bdc-a919-d7913f1bf5a1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_bcf728fe-f8c2-40e9-a6d3-3d542aef3d6e" xlink:to="loc_dei_EntityDomain_569725cd-bbce-4bdc-a919-d7913f1bf5a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_a358f915-3643-4289-a06c-bc6b892382f7" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_569725cd-bbce-4bdc-a919-d7913f1bf5a1" xlink:to="loc_aal_AmericanAirlinesIncMember_a358f915-3643-4289-a06c-bc6b892382f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_343b42a6-0d51-4536-a605-7a97c2e9d198" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_88d6155a-3e6b-4aa6-ba0e-b0bc051c0250" xlink:to="loc_srt_ProductOrServiceAxis_343b42a6-0d51-4536-a605-7a97c2e9d198" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_343b42a6-0d51-4536-a605-7a97c2e9d198_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_343b42a6-0d51-4536-a605-7a97c2e9d198" xlink:to="loc_srt_ProductsAndServicesDomain_343b42a6-0d51-4536-a605-7a97c2e9d198_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_6493eda8-7869-4a48-8642-3cc4f81309ab" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_343b42a6-0d51-4536-a605-7a97c2e9d198" xlink:to="loc_srt_ProductsAndServicesDomain_6493eda8-7869-4a48-8642-3cc4f81309ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MainlineMember_9078ed6f-63c4-4681-800a-ebd5dd9f4b53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MainlineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_6493eda8-7869-4a48-8642-3cc4f81309ab" xlink:to="loc_us-gaap_MainlineMember_9078ed6f-63c4-4681-800a-ebd5dd9f4b53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegionalCarrierMember_603b475f-1a52-473e-b95c-a77990726ac8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RegionalCarrierMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_6493eda8-7869-4a48-8642-3cc4f81309ab" xlink:to="loc_us-gaap_RegionalCarrierMember_603b475f-1a52-473e-b95c-a77990726ac8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollectiveBargainingArrangementAxis_6f7b158c-9630-4444-8e2b-2561ef0b3a1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollectiveBargainingArrangementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_88d6155a-3e6b-4aa6-ba0e-b0bc051c0250" xlink:to="loc_us-gaap_CollectiveBargainingArrangementAxis_6f7b158c-9630-4444-8e2b-2561ef0b3a1c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollectiveBargainingArrangementDomain_6f7b158c-9630-4444-8e2b-2561ef0b3a1c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollectiveBargainingArrangementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollectiveBargainingArrangementAxis_6f7b158c-9630-4444-8e2b-2561ef0b3a1c" xlink:to="loc_us-gaap_CollectiveBargainingArrangementDomain_6f7b158c-9630-4444-8e2b-2561ef0b3a1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollectiveBargainingArrangementDomain_0703275f-8b84-4625-8c43-5dc01d8905b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollectiveBargainingArrangementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollectiveBargainingArrangementAxis_6f7b158c-9630-4444-8e2b-2561ef0b3a1c" xlink:to="loc_us-gaap_CollectiveBargainingArrangementDomain_0703275f-8b84-4625-8c43-5dc01d8905b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AlliedPilotsAssociationMember_db7bb31e-67fe-4895-a311-0129fe9e830e" xlink:href="aal-20251231.xsd#aal_AlliedPilotsAssociationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollectiveBargainingArrangementDomain_0703275f-8b84-4625-8c43-5dc01d8905b4" xlink:to="loc_aal_AlliedPilotsAssociationMember_db7bb31e-67fe-4895-a311-0129fe9e830e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_44146306-02f1-4dee-9c81-01a69ef493cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_88d6155a-3e6b-4aa6-ba0e-b0bc051c0250" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_44146306-02f1-4dee-9c81-01a69ef493cb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_44146306-02f1-4dee-9c81-01a69ef493cb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_44146306-02f1-4dee-9c81-01a69ef493cb" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_44146306-02f1-4dee-9c81-01a69ef493cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_f5aef721-ff56-4f0c-a359-84ab5e810f95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_44146306-02f1-4dee-9c81-01a69ef493cb" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_f5aef721-ff56-4f0c-a359-84ab5e810f95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_3417053a-75bd-4951-acd5-14dbb59b1499" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_f5aef721-ff56-4f0c-a359-84ab5e810f95" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_3417053a-75bd-4951-acd5-14dbb59b1499" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AircraftTypeAxis_c9f45fe1-8d3f-42e2-ac05-317b697c8d9d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AircraftTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_88d6155a-3e6b-4aa6-ba0e-b0bc051c0250" xlink:to="loc_srt_AircraftTypeAxis_c9f45fe1-8d3f-42e2-ac05-317b697c8d9d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AircraftTypeMember_c9f45fe1-8d3f-42e2-ac05-317b697c8d9d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AircraftTypeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_AircraftTypeAxis_c9f45fe1-8d3f-42e2-ac05-317b697c8d9d" xlink:to="loc_srt_AircraftTypeMember_c9f45fe1-8d3f-42e2-ac05-317b697c8d9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AircraftTypeMember_09d3cefd-bcc7-410e-8157-6a5d3044d39c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AircraftTypeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_AircraftTypeAxis_c9f45fe1-8d3f-42e2-ac05-317b697c8d9d" xlink:to="loc_srt_AircraftTypeMember_09d3cefd-bcc7-410e-8157-6a5d3044d39c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_EmbraerERJ145AircraftMember_5cbf0d7e-5932-434f-b842-319c5274ea9a" xlink:href="aal-20251231.xsd#aal_EmbraerERJ145AircraftMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_AircraftTypeMember_09d3cefd-bcc7-410e-8157-6a5d3044d39c" xlink:to="loc_aal_EmbraerERJ145AircraftMember_5cbf0d7e-5932-434f-b842-319c5274ea9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossRelatedToLitigationSettlement_2607622e-d3db-48e9-8f81-849ca76279a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossRelatedToLitigationSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_us-gaap_GainLossRelatedToLitigationSettlement_2607622e-d3db-48e9-8f81-849ca76279a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLaborRelatedExpenses_fc426b67-8744-4148-ae74-af61c71f0883" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLaborRelatedExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_us-gaap_OtherLaborRelatedExpenses_fc426b67-8744-4148-ae74-af61c71f0883" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeveranceCosts1_0b0a7e77-df37-476c-8a24-4419bcf1126f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeveranceCosts1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_us-gaap_SeveranceCosts1_0b0a7e77-df37-476c-8a24-4419bcf1126f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FlightEquipmentOperatingLeaseAndInventoryAdjustments_8cf53efb-60a7-46c9-ada7-fcec2d12bd6c" xlink:href="aal-20251231.xsd#aal_FlightEquipmentOperatingLeaseAndInventoryAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_aal_FlightEquipmentOperatingLeaseAndInventoryAdjustments_8cf53efb-60a7-46c9-ada7-fcec2d12bd6c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OtherOperatingSpecialChargesNet_bfb54593-2cb9-4764-8082-2647049220d4" xlink:href="aal-20251231.xsd#aal_OtherOperatingSpecialChargesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_aal_OtherOperatingSpecialChargesNet_bfb54593-2cb9-4764-8082-2647049220d4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RestructuringAndOtherNet_78d32524-9bb6-4043-a02b-31c9b1ed4990" xlink:href="aal-20251231.xsd#aal_RestructuringAndOtherNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_aal_RestructuringAndOtherNet_78d32524-9bb6-4043-a02b-31c9b1ed4990" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_6a27b2f6-e387-4ab7-ba9a-3f58c8f9de44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_6a27b2f6-e387-4ab7-ba9a-3f58c8f9de44" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ExtinguishmentAndRefinanceOfDebtAmount_8247e97c-d92d-4240-9b3b-56f2c8a29cee" xlink:href="aal-20251231.xsd#aal_ExtinguishmentAndRefinanceOfDebtAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_aal_ExtinguishmentAndRefinanceOfDebtAmount_8247e97c-d92d-4240-9b3b-56f2c8a29cee" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OtherNonoperatingSpecialItemsNet_019c2a67-f93b-7e9d-a948-746124cef4af" xlink:href="aal-20251231.xsd#aal_OtherNonoperatingSpecialItemsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_aal_OtherNonoperatingSpecialItemsNet_019c2a67-f93b-7e9d-a948-746124cef4af" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_NonoperatingSpecialItemsNet_b6126697-0184-43f6-86b9-aaf5bf0c01e6" xlink:href="aal-20251231.xsd#aal_NonoperatingSpecialItemsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_aal_NonoperatingSpecialItemsNet_b6126697-0184-43f6-86b9-aaf5bf0c01e6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CollectiveBargainingAgreementOneTimePaymentAmount_52910752-beb7-47d4-a8e0-e1281457318e" xlink:href="aal-20251231.xsd#aal_CollectiveBargainingAgreementOneTimePaymentAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_aal_CollectiveBargainingAgreementOneTimePaymentAmount_52910752-beb7-47d4-a8e0-e1281457318e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CollectiveBargainingAgreementAdjustmentsToOtherBenefitRelatedItems_44566254-f274-4a09-9980-afc1f548ad73" xlink:href="aal-20251231.xsd#aal_CollectiveBargainingAgreementAdjustmentsToOtherBenefitRelatedItems"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_aal_CollectiveBargainingAgreementAdjustmentsToOtherBenefitRelatedItems_44566254-f274-4a09-9980-afc1f548ad73" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FlightEquipmentOperatingLeaseAndInventoryAdjustments_df6b2dd7-44cf-4e4f-b82b-4b4d33b4b89e" xlink:href="aal-20251231.xsd#aal_FlightEquipmentOperatingLeaseAndInventoryAdjustments"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_NumberOfAircraftsPermanentlyParked_ead8dfc3-bb8c-470a-90bc-702e2db6324b" xlink:href="aal-20251231.xsd#aal_NumberOfAircraftsPermanentlyParked"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_62b4fab9-7144-49fa-8a4b-b3e9cd62fc7e" xlink:to="loc_aal_NumberOfAircraftsPermanentlyParked_ead8dfc3-bb8c-470a-90bc-702e2db6324b" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EarningsPerCommonShareAntiDilutiveSecuritiesExcludedFromCalculationofDilutedEPSDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EarningsPerCommonShareAntiDilutiveSecuritiesExcludedFromCalculationofDilutedEPSDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EarningsPerCommonShareAntiDilutiveSecuritiesExcludedFromCalculationofDilutedEPSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_2f25fefa-351e-46b2-b70f-122f6a5237d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_d2045c84-8085-47d6-bdea-7c89c3cb5971" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_2f25fefa-351e-46b2-b70f-122f6a5237d3" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_d2045c84-8085-47d6-bdea-7c89c3cb5971" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2583c4d8-703b-4473-9860-7222cd8117ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_d2045c84-8085-47d6-bdea-7c89c3cb5971" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2583c4d8-703b-4473-9860-7222cd8117ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_2583c4d8-703b-4473-9860-7222cd8117ab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2583c4d8-703b-4473-9860-7222cd8117ab" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_2583c4d8-703b-4473-9860-7222cd8117ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_60130725-79c5-4552-b994-c7d9f6bbcebb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2583c4d8-703b-4473-9860-7222cd8117ab" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_60130725-79c5-4552-b994-c7d9f6bbcebb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtSecuritiesMember_edf89a8e-8e5a-441c-b273-f74ae30151bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_60130725-79c5-4552-b994-c7d9f6bbcebb" xlink:to="loc_us-gaap_ConvertibleDebtSecuritiesMember_edf89a8e-8e5a-441c-b273-f74ae30151bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_105e27d2-e8f5-4fdd-842b-36f139f2d0d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_60130725-79c5-4552-b994-c7d9f6bbcebb" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_105e27d2-e8f5-4fdd-842b-36f139f2d0d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_1c75467c-3fb8-42cf-b2ed-b92242400c88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_2f25fefa-351e-46b2-b70f-122f6a5237d3" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_1c75467c-3fb8-42cf-b2ed-b92242400c88" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EarningsPerCommonShareAdditionalInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EarningsPerCommonShareAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EarningsPerCommonShareAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightLineItems_019ba4c2-240c-7999-86d5-93a3b295d344" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightTable_019ba4c2-240c-73d9-a6ef-5216b31603ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019ba4c2-240c-7999-86d5-93a3b295d344" xlink:to="loc_us-gaap_ClassOfWarrantOrRightTable_019ba4c2-240c-73d9-a6ef-5216b31603ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GovernmentAssistanceTypeAxis_019ba4c2-240c-71fb-90c3-14b2b52e32bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentAssistanceTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_019ba4c2-240c-73d9-a6ef-5216b31603ad" xlink:to="loc_us-gaap_GovernmentAssistanceTypeAxis_019ba4c2-240c-71fb-90c3-14b2b52e32bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GovernmentAssistanceTypeDomain_019ba4c2-240c-71fb-90c3-14b2b52e32bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentAssistanceTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GovernmentAssistanceTypeAxis_019ba4c2-240c-71fb-90c3-14b2b52e32bd" xlink:to="loc_us-gaap_GovernmentAssistanceTypeDomain_019ba4c2-240c-71fb-90c3-14b2b52e32bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GovernmentAssistanceTypeDomain_019ba4c2-240c-7670-a7b2-c1de93cefb5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentAssistanceTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GovernmentAssistanceTypeAxis_019ba4c2-240c-71fb-90c3-14b2b52e32bd" xlink:to="loc_us-gaap_GovernmentAssistanceTypeDomain_019ba4c2-240c-7670-a7b2-c1de93cefb5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PayrollSupportProgramOneWarrantsCARESActMember_019ba4c2-240c-7434-9a4f-7967f18d3cd3" xlink:href="aal-20251231.xsd#aal_PayrollSupportProgramOneWarrantsCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GovernmentAssistanceTypeDomain_019ba4c2-240c-7670-a7b2-c1de93cefb5e" xlink:to="loc_aal_PayrollSupportProgramOneWarrantsCARESActMember_019ba4c2-240c-7434-9a4f-7967f18d3cd3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_TreasuryLoanWarrantAgreementCARESActMember_019ba4c2-240c-729d-89ca-0f1ff76a2766" xlink:href="aal-20251231.xsd#aal_TreasuryLoanWarrantAgreementCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GovernmentAssistanceTypeDomain_019ba4c2-240c-7670-a7b2-c1de93cefb5e" xlink:to="loc_aal_TreasuryLoanWarrantAgreementCARESActMember_019ba4c2-240c-729d-89ca-0f1ff76a2766" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PayrollSupportProgramOneWarrantsAndTreasuryLoanWarrantAgreementCARESActMember_019ba4c2-240c-730a-9aad-73b2ecb77be7" xlink:href="aal-20251231.xsd#aal_PayrollSupportProgramOneWarrantsAndTreasuryLoanWarrantAgreementCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GovernmentAssistanceTypeDomain_019ba4c2-240c-7670-a7b2-c1de93cefb5e" xlink:to="loc_aal_PayrollSupportProgramOneWarrantsAndTreasuryLoanWarrantAgreementCARESActMember_019ba4c2-240c-730a-9aad-73b2ecb77be7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ClassOfWarrantOrRightExercisesInPeriod_019ba4c2-240c-70d1-9232-7892c6418dee" xlink:href="aal-20251231.xsd#aal_ClassOfWarrantOrRightExercisesInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019ba4c2-240c-7999-86d5-93a3b295d344" xlink:to="loc_aal_ClassOfWarrantOrRightExercisesInPeriod_019ba4c2-240c-70d1-9232-7892c6418dee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019ba4c2-240c-71db-9fb0-bbb5a8e14293" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019ba4c2-240c-7999-86d5-93a3b295d344" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019ba4c2-240c-71db-9fb0-bbb5a8e14293" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PaymentsForNetSettlementOfWarrantExercise_019ba4c2-240c-7f68-bec9-ea81b733cd78" xlink:href="aal-20251231.xsd#aal_PaymentsForNetSettlementOfWarrantExercise"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019ba4c2-240c-7999-86d5-93a3b295d344" xlink:to="loc_aal_PaymentsForNetSettlementOfWarrantExercise_019ba4c2-240c-7f68-bec9-ea81b733cd78" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EarningsPerCommonShareScheduleofWarrantsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EarningsPerCommonShareScheduleofWarrantsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EarningsPerCommonShareScheduleofWarrantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightLineItems_607cc194-8f5e-4545-b4b6-92e37dac22de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightTable_12eb0ffd-3627-4ea0-a231-3057e571ee49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_607cc194-8f5e-4545-b4b6-92e37dac22de" xlink:to="loc_us-gaap_ClassOfWarrantOrRightTable_12eb0ffd-3627-4ea0-a231-3057e571ee49" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GovernmentAssistanceTypeAxis_1e0b090f-2a5f-46f7-a630-ae513679619b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentAssistanceTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_12eb0ffd-3627-4ea0-a231-3057e571ee49" xlink:to="loc_us-gaap_GovernmentAssistanceTypeAxis_1e0b090f-2a5f-46f7-a630-ae513679619b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GovernmentAssistanceTypeDomain_1e0b090f-2a5f-46f7-a630-ae513679619b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentAssistanceTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GovernmentAssistanceTypeAxis_1e0b090f-2a5f-46f7-a630-ae513679619b" xlink:to="loc_us-gaap_GovernmentAssistanceTypeDomain_1e0b090f-2a5f-46f7-a630-ae513679619b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GovernmentAssistanceTypeDomain_7542c820-c5ad-4488-8422-e12fd88e5927" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentAssistanceTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GovernmentAssistanceTypeAxis_1e0b090f-2a5f-46f7-a630-ae513679619b" xlink:to="loc_us-gaap_GovernmentAssistanceTypeDomain_7542c820-c5ad-4488-8422-e12fd88e5927" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PayrollSupportProgramTwoWarrantsCARESActMember_b37e5f1a-12c1-4f92-8b09-6935c2462c65" xlink:href="aal-20251231.xsd#aal_PayrollSupportProgramTwoWarrantsCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GovernmentAssistanceTypeDomain_7542c820-c5ad-4488-8422-e12fd88e5927" xlink:to="loc_aal_PayrollSupportProgramTwoWarrantsCARESActMember_b37e5f1a-12c1-4f92-8b09-6935c2462c65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PayrollSupportProgramThreeWarrantsCARESActMember_046f2c6f-7b47-42fe-b009-d18fef8bbefe" xlink:href="aal-20251231.xsd#aal_PayrollSupportProgramThreeWarrantsCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GovernmentAssistanceTypeDomain_7542c820-c5ad-4488-8422-e12fd88e5927" xlink:to="loc_aal_PayrollSupportProgramThreeWarrantsCARESActMember_046f2c6f-7b47-42fe-b009-d18fef8bbefe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019c2a6d-79cf-7f1d-8627-09924adf7a51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_12eb0ffd-3627-4ea0-a231-3057e571ee49" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019c2a6d-79cf-7f1d-8627-09924adf7a51" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c2a6d-79cf-7f1d-8627-09924adf7a51_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c2a6d-79cf-7f1d-8627-09924adf7a51" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c2a6d-79cf-7f1d-8627-09924adf7a51_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c2a6d-79cf-7462-b625-b3b1a36e5b2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c2a6d-79cf-7f1d-8627-09924adf7a51" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c2a6d-79cf-7462-b625-b3b1a36e5b2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019c2a6d-79cf-7f44-aa68-1b34e4228567" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019c2a6d-79cf-7462-b625-b3b1a36e5b2e" xlink:to="loc_us-gaap_SubsequentEventMember_019c2a6d-79cf-7f44-aa68-1b34e4228567" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_ff165608-6d0d-46a1-a8b7-378121954b92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_607cc194-8f5e-4545-b4b6-92e37dac22de" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_ff165608-6d0d-46a1-a8b7-378121954b92" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_538866f0-c1de-4799-8cc8-645992ab87b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_607cc194-8f5e-4545-b4b6-92e37dac22de" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_538866f0-c1de-4799-8cc8-645992ab87b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ClassOfWarrantOrRightExercisesInPeriod_019c2a6d-79cf-7e23-ae65-695730f55cf1" xlink:href="aal-20251231.xsd#aal_ClassOfWarrantOrRightExercisesInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_607cc194-8f5e-4545-b4b6-92e37dac22de" xlink:to="loc_aal_ClassOfWarrantOrRightExercisesInPeriod_019c2a6d-79cf-7e23-ae65-695730f55cf1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtComponentsofDebtDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtComponentsofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtComponentsofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_99160589-18c5-4e81-aea4-309258a9a99a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:to="loc_us-gaap_DebtInstrumentTable_99160589-18c5-4e81-aea4-309258a9a99a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_27b83cad-8d55-442f-831d-231d24951311" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_99160589-18c5-4e81-aea4-309258a9a99a" xlink:to="loc_dei_LegalEntityAxis_27b83cad-8d55-442f-831d-231d24951311" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_27b83cad-8d55-442f-831d-231d24951311_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_27b83cad-8d55-442f-831d-231d24951311" xlink:to="loc_dei_EntityDomain_27b83cad-8d55-442f-831d-231d24951311_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_c068b482-68a5-4a75-a19a-a8b124dca57f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_27b83cad-8d55-442f-831d-231d24951311" xlink:to="loc_dei_EntityDomain_c068b482-68a5-4a75-a19a-a8b124dca57f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_fd84f830-24aa-4e1a-bc16-f354ca05d58e" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_c068b482-68a5-4a75-a19a-a8b124dca57f" xlink:to="loc_aal_AmericanAirlinesIncMember_fd84f830-24aa-4e1a-bc16-f354ca05d58e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_e081ced0-fe48-472a-b58b-3d8aae18cc16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_99160589-18c5-4e81-aea4-309258a9a99a" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_e081ced0-fe48-472a-b58b-3d8aae18cc16" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e081ced0-fe48-472a-b58b-3d8aae18cc16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e081ced0-fe48-472a-b58b-3d8aae18cc16" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e081ced0-fe48-472a-b58b-3d8aae18cc16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9bc2923c-6ae4-4683-9c63-d50b4cf620f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e081ced0-fe48-472a-b58b-3d8aae18cc16" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9bc2923c-6ae4-4683-9c63-d50b4cf620f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_b2937000-7b45-45bb-a730-523657dc1bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_9bc2923c-6ae4-4683-9c63-d50b4cf620f3" xlink:to="loc_us-gaap_SecuredDebtMember_b2937000-7b45-45bb-a730-523657dc1bdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_6f2657f3-6341-4ffd-8a81-1eac29106ffa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_99160589-18c5-4e81-aea4-309258a9a99a" xlink:to="loc_us-gaap_DebtInstrumentAxis_6f2657f3-6341-4ffd-8a81-1eac29106ffa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6f2657f3-6341-4ffd-8a81-1eac29106ffa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_6f2657f3-6341-4ffd-8a81-1eac29106ffa" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6f2657f3-6341-4ffd-8a81-1eac29106ffa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_6f2657f3-6341-4ffd-8a81-1eac29106ffa" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CreditFacility2013Member_def8aaf3-4759-4427-a822-f3905a50a2b1" xlink:href="aal-20251231.xsd#aal_CreditFacility2013Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_CreditFacility2013Member_def8aaf3-4759-4427-a822-f3905a50a2b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CreditFacility2014Member_46164900-dd91-444f-a58f-4f080989de02" xlink:href="aal-20251231.xsd#aal_CreditFacility2014Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_CreditFacility2014Member_46164900-dd91-444f-a58f-4f080989de02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CreditFacility2023Member_c0891b01-0726-46a8-b45c-5ccbd735ad2b" xlink:href="aal-20251231.xsd#aal_CreditFacility2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_CreditFacility2023Member_c0891b01-0726-46a8-b45c-5ccbd735ad2b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A1075SeniorSecuredNotesIPNotesMember_f39e892a-a1c4-42d4-9189-90511d548319" xlink:href="aal-20251231.xsd#aal_A1075SeniorSecuredNotesIPNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_A1075SeniorSecuredNotesIPNotesMember_f39e892a-a1c4-42d4-9189-90511d548319" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A1075SeniorSecuredNotesLGADCANotesMember_5fd5c82f-d330-453e-90c9-3f0f0d00b6fd" xlink:href="aal-20251231.xsd#aal_A1075SeniorSecuredNotesLGADCANotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_A1075SeniorSecuredNotesLGADCANotesMember_5fd5c82f-d330-453e-90c9-3f0f0d00b6fd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A725SeniorSecuredNotesDue2028Member_96c66f59-8059-4c0c-9a8a-b56de38dbfd3" xlink:href="aal-20251231.xsd#aal_A725SeniorSecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_A725SeniorSecuredNotesDue2028Member_96c66f59-8059-4c0c-9a8a-b56de38dbfd3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A850SeniorSecuredNotesDue2029Member_a83b3af5-7bce-4135-952c-464120631f3d" xlink:href="aal-20251231.xsd#aal_A850SeniorSecuredNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_A850SeniorSecuredNotesDue2029Member_a83b3af5-7bce-4135-952c-464120631f3d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SeniorNote550Matures2026Member_339c176f-da8d-4fd1-aa8e-3f7a8e8e178c" xlink:href="aal-20251231.xsd#aal_SeniorNote550Matures2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_SeniorNote550Matures2026Member_339c176f-da8d-4fd1-aa8e-3f7a8e8e178c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SeniorNote575Matures2029Member_27b0230f-ec1d-44f0-a6a4-2609a97b4d4a" xlink:href="aal-20251231.xsd#aal_SeniorNote575Matures2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_SeniorNote575Matures2029Member_27b0230f-ec1d-44f0-a6a4-2609a97b4d4a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A2021AAdvantageTermLoanFacilityMember_019ba4c5-eae1-7ed8-837c-14a7f1a96225" xlink:href="aal-20251231.xsd#aal_A2021AAdvantageTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_A2021AAdvantageTermLoanFacilityMember_019ba4c5-eae1-7ed8-837c-14a7f1a96225" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A2025AAdvantageTermLoanFacilityMember_019ba4c7-6d69-7973-9704-921bfe46118d" xlink:href="aal-20251231.xsd#aal_A2025AAdvantageTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_A2025AAdvantageTermLoanFacilityMember_019ba4c7-6d69-7973-9704-921bfe46118d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnhancedEquipmentTrustCertificateMember_3faa581b-a0da-490d-9abb-e378757b11b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnhancedEquipmentTrustCertificateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_us-gaap_EnhancedEquipmentTrustCertificateMember_3faa581b-a0da-490d-9abb-e378757b11b0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_EquipmentLoansAndOtherNotesPayableMember_cdc0fcc0-2ef2-4a4c-8a70-8064a91c701c" xlink:href="aal-20251231.xsd#aal_EquipmentLoansAndOtherNotesPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_EquipmentLoansAndOtherNotesPayableMember_cdc0fcc0-2ef2-4a4c-8a70-8064a91c701c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SpecialFacilityRevenueBondsMember_0d7d2f1d-b840-4e73-a690-f3b9c3ebb549" xlink:href="aal-20251231.xsd#aal_SpecialFacilityRevenueBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_SpecialFacilityRevenueBondsMember_0d7d2f1d-b840-4e73-a690-f3b9c3ebb549" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PayrollSupportProgramPromissoryNoteOneCARESActMember_c5688252-388c-494b-9328-0bd1ab4e9018" xlink:href="aal-20251231.xsd#aal_PayrollSupportProgramPromissoryNoteOneCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_PayrollSupportProgramPromissoryNoteOneCARESActMember_c5688252-388c-494b-9328-0bd1ab4e9018" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PayrollSupportProgramPromissoryNoteTwoCARESActMember_e8c48330-4cba-4be1-95ae-e5be5252d7fd" xlink:href="aal-20251231.xsd#aal_PayrollSupportProgramPromissoryNoteTwoCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_PayrollSupportProgramPromissoryNoteTwoCARESActMember_e8c48330-4cba-4be1-95ae-e5be5252d7fd" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PayrollSupportProgramPromissoryNoteThreeCARESActMember_8b885eef-4a07-44bd-9bd9-5f663e99149e" xlink:href="aal-20251231.xsd#aal_PayrollSupportProgramPromissoryNoteThreeCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_PayrollSupportProgramPromissoryNoteThreeCARESActMember_8b885eef-4a07-44bd-9bd9-5f663e99149e" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ConvertibleSeniorNotes650Due2025Member_22e22944-5583-489e-a8be-227208568e20" xlink:href="aal-20251231.xsd#aal_ConvertibleSeniorNotes650Due2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_ConvertibleSeniorNotes650Due2025Member_22e22944-5583-489e-a8be-227208568e20" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SeniorUnsecuredShortTermLoanFacilityMember_019bafe1-2e75-70aa-9013-39958142eae8" xlink:href="aal-20251231.xsd#aal_SeniorUnsecuredShortTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a622516c-b0a1-41c0-9f36-92c6eff31958" xlink:to="loc_aal_SeniorUnsecuredShortTermLoanFacilityMember_019bafe1-2e75-70aa-9013-39958142eae8" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d0c502f9-9542-491b-8087-9cfa463f7f1d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_99160589-18c5-4e81-aea4-309258a9a99a" xlink:to="loc_srt_RangeAxis_d0c502f9-9542-491b-8087-9cfa463f7f1d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d0c502f9-9542-491b-8087-9cfa463f7f1d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d0c502f9-9542-491b-8087-9cfa463f7f1d" xlink:to="loc_srt_RangeMember_d0c502f9-9542-491b-8087-9cfa463f7f1d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bb2648c7-26cf-497b-8847-f465b544dc8d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d0c502f9-9542-491b-8087-9cfa463f7f1d" xlink:to="loc_srt_RangeMember_bb2648c7-26cf-497b-8847-f465b544dc8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_96cab53a-f7d8-43ef-8349-dcbcab12ca72" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bb2648c7-26cf-497b-8847-f465b544dc8d" xlink:to="loc_srt_MinimumMember_96cab53a-f7d8-43ef-8349-dcbcab12ca72" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2242002b-2102-407f-aeb7-c1bca1c5c39c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bb2648c7-26cf-497b-8847-f465b544dc8d" xlink:to="loc_srt_MaximumMember_2242002b-2102-407f-aeb7-c1bca1c5c39c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LongTermAndShortTermDebtTypeAxis_019ba4d3-d2d6-7a90-aea7-b476eca0a10b" xlink:href="aal-20251231.xsd#aal_LongTermAndShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_99160589-18c5-4e81-aea4-309258a9a99a" xlink:to="loc_aal_LongTermAndShortTermDebtTypeAxis_019ba4d3-d2d6-7a90-aea7-b476eca0a10b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LongTermAndShortTermDebtTypeDomain_019ba4d3-d2d6-7a90-aea7-b476eca0a10b_default" xlink:href="aal-20251231.xsd#aal_LongTermAndShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_aal_LongTermAndShortTermDebtTypeAxis_019ba4d3-d2d6-7a90-aea7-b476eca0a10b" xlink:to="loc_aal_LongTermAndShortTermDebtTypeDomain_019ba4d3-d2d6-7a90-aea7-b476eca0a10b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LongTermAndShortTermDebtTypeDomain_019ba4d3-d2d6-744b-92b1-4a6799840614" xlink:href="aal-20251231.xsd#aal_LongTermAndShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_aal_LongTermAndShortTermDebtTypeAxis_019ba4d3-d2d6-7a90-aea7-b476eca0a10b" xlink:to="loc_aal_LongTermAndShortTermDebtTypeDomain_019ba4d3-d2d6-744b-92b1-4a6799840614" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_019ba4d3-f5a1-7b8a-9dd6-ee2a3e6341f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_LongTermAndShortTermDebtTypeDomain_019ba4d3-d2d6-744b-92b1-4a6799840614" xlink:to="loc_us-gaap_UnsecuredDebtMember_019ba4d3-f5a1-7b8a-9dd6-ee2a3e6341f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_019bb410-f471-7d7d-ab86-f8f1d8b9a79e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_99160589-18c5-4e81-aea4-309258a9a99a" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_019bb410-f471-7d7d-ab86-f8f1d8b9a79e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019bb410-f471-7d7d-ab86-f8f1d8b9a79e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_019bb410-f471-7d7d-ab86-f8f1d8b9a79e" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019bb410-f471-7d7d-ab86-f8f1d8b9a79e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019bb410-f471-7e57-bc77-a8ccaa06ad8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_019bb410-f471-7d7d-ab86-f8f1d8b9a79e" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019bb410-f471-7e57-bc77-a8ccaa06ad8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_019bb411-18be-7556-8240-e37659c01917" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_019bb410-f471-7e57-bc77-a8ccaa06ad8b" xlink:to="loc_us-gaap_UnsecuredDebtMember_019bb411-18be-7556-8240-e37659c01917" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_d86226e2-c79e-4290-9c0d-78743cf2a53d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_d86226e2-c79e-4290-9c0d-78743cf2a53d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_019ba4d6-91fc-752f-a091-f389ddd04b4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:to="loc_us-gaap_ShortTermBorrowings_019ba4d6-91fc-752f-a091-f389ddd04b4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_019ba4d1-5415-73fc-a5e5-ead8812254b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_019ba4d1-5415-73fc-a5e5-ead8812254b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_2d0a0ea9-40ff-4143-aff7-dc66ba667e3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_2d0a0ea9-40ff-4143-aff7-dc66ba667e3f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_ff517189-1193-4528-8980-dff01a544aee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:to="loc_us-gaap_LongTermDebtCurrent_ff517189-1193-4528-8980-dff01a544aee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019c6d7b-1820-7828-bcf6-de3bcc156ddd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:to="loc_us-gaap_LongTermDebt_019c6d7b-1820-7828-bcf6-de3bcc156ddd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtPercentageBearingVariableInterestRate_8be66c6d-00f1-4345-ac05-810646640925" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtPercentageBearingVariableInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:to="loc_us-gaap_LongTermDebtPercentageBearingVariableInterestRate_8be66c6d-00f1-4345-ac05-810646640925" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_26944fe9-8060-4650-b0a1-2a29352883fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_26944fe9-8060-4650-b0a1-2a29352883fc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_be3b368d-422d-4c35-a72a-172551dc35c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_be3b368d-422d-4c35-a72a-172551dc35c0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtPercentageBearingVariableInterestRate_019ba4d5-b7ea-7dbe-a546-542b182d7cfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtPercentageBearingVariableInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e6351d4b-0a86-4018-9982-5932357ed85f" xlink:to="loc_us-gaap_ShortTermDebtPercentageBearingVariableInterestRate_019ba4d5-b7ea-7dbe-a546-542b182d7cfe" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtSummaryofAvailabilityunderRevolvingCreditFacilitiesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtSummaryofAvailabilityunderRevolvingCreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtSummaryofAvailabilityunderRevolvingCreditFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_ef6ab5fa-f8ee-468e-bc8c-54da1a298b53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_0ca73709-d927-4f4b-b348-50e57aa96d09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_ef6ab5fa-f8ee-468e-bc8c-54da1a298b53" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_0ca73709-d927-4f4b-b348-50e57aa96d09" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_656e7066-5462-4d2d-a248-e6023731bcd5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_0ca73709-d927-4f4b-b348-50e57aa96d09" xlink:to="loc_dei_LegalEntityAxis_656e7066-5462-4d2d-a248-e6023731bcd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_656e7066-5462-4d2d-a248-e6023731bcd5_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_656e7066-5462-4d2d-a248-e6023731bcd5" xlink:to="loc_dei_EntityDomain_656e7066-5462-4d2d-a248-e6023731bcd5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3967a74c-632d-4a12-a942-91bdca5832ff" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_656e7066-5462-4d2d-a248-e6023731bcd5" xlink:to="loc_dei_EntityDomain_3967a74c-632d-4a12-a942-91bdca5832ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_c2660fc1-bf68-460c-bcff-b752bfe719da" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_3967a74c-632d-4a12-a942-91bdca5832ff" xlink:to="loc_aal_AmericanAirlinesIncMember_c2660fc1-bf68-460c-bcff-b752bfe719da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_eee99fba-e429-43cb-a1d5-a7f6b3af5ca5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_0ca73709-d927-4f4b-b348-50e57aa96d09" xlink:to="loc_us-gaap_CreditFacilityAxis_eee99fba-e429-43cb-a1d5-a7f6b3af5ca5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_eee99fba-e429-43cb-a1d5-a7f6b3af5ca5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_eee99fba-e429-43cb-a1d5-a7f6b3af5ca5" xlink:to="loc_us-gaap_CreditFacilityDomain_eee99fba-e429-43cb-a1d5-a7f6b3af5ca5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_afb62f0d-6307-4425-8ffa-09ea73a99065" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_eee99fba-e429-43cb-a1d5-a7f6b3af5ca5" xlink:to="loc_us-gaap_CreditFacilityDomain_afb62f0d-6307-4425-8ffa-09ea73a99065" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_72a0ce0f-4914-4db4-aded-5d351a03e3b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_afb62f0d-6307-4425-8ffa-09ea73a99065" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_72a0ce0f-4914-4db4-aded-5d351a03e3b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_db0f12ef-f6ed-44d9-bd08-de515a8c84b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_0ca73709-d927-4f4b-b348-50e57aa96d09" xlink:to="loc_us-gaap_DebtInstrumentAxis_db0f12ef-f6ed-44d9-bd08-de515a8c84b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_db0f12ef-f6ed-44d9-bd08-de515a8c84b5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_db0f12ef-f6ed-44d9-bd08-de515a8c84b5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_db0f12ef-f6ed-44d9-bd08-de515a8c84b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f1ace36e-164d-4fae-b6e1-94c0a267f307" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_db0f12ef-f6ed-44d9-bd08-de515a8c84b5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f1ace36e-164d-4fae-b6e1-94c0a267f307" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A20132014And2023CreditFacilitiesMember_b0cc59e8-aefe-49ee-83c1-c28c0ac87c1f" xlink:href="aal-20251231.xsd#aal_A20132014And2023CreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f1ace36e-164d-4fae-b6e1-94c0a267f307" xlink:to="loc_aal_A20132014And2023CreditFacilitiesMember_b0cc59e8-aefe-49ee-83c1-c28c0ac87c1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CreditFacility2013Member_7cd7c8ae-bab1-47b0-8120-5b5ecc0b598e" xlink:href="aal-20251231.xsd#aal_CreditFacility2013Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_A20132014And2023CreditFacilitiesMember_b0cc59e8-aefe-49ee-83c1-c28c0ac87c1f" xlink:to="loc_aal_CreditFacility2013Member_7cd7c8ae-bab1-47b0-8120-5b5ecc0b598e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CreditFacility2014Member_f892e8dd-5f15-4828-bb9c-42360fee1135" xlink:href="aal-20251231.xsd#aal_CreditFacility2014Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_A20132014And2023CreditFacilitiesMember_b0cc59e8-aefe-49ee-83c1-c28c0ac87c1f" xlink:to="loc_aal_CreditFacility2014Member_f892e8dd-5f15-4828-bb9c-42360fee1135" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CreditFacility2023Member_37032c82-f6cc-49c4-9923-af455f7fed21" xlink:href="aal-20251231.xsd#aal_CreditFacility2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_A20132014And2023CreditFacilitiesMember_b0cc59e8-aefe-49ee-83c1-c28c0ac87c1f" xlink:to="loc_aal_CreditFacility2023Member_37032c82-f6cc-49c4-9923-af455f7fed21" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ShortTermRevolvingAndOtherFacilitiesMember_02e3b4dd-3370-4025-9d53-4b207f11edca" xlink:href="aal-20251231.xsd#aal_ShortTermRevolvingAndOtherFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f1ace36e-164d-4fae-b6e1-94c0a267f307" xlink:to="loc_aal_ShortTermRevolvingAndOtherFacilitiesMember_02e3b4dd-3370-4025-9d53-4b207f11edca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OtherRevolvingFacilityMember_d8dbbbd9-f226-42f7-a694-ed33e154eb47" xlink:href="aal-20251231.xsd#aal_OtherRevolvingFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_ShortTermRevolvingAndOtherFacilitiesMember_02e3b4dd-3370-4025-9d53-4b207f11edca" xlink:to="loc_aal_OtherRevolvingFacilityMember_d8dbbbd9-f226-42f7-a694-ed33e154eb47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CargoReceivableFacilityMember_07891837-0096-48cb-8119-1b09d5af3976" xlink:href="aal-20251231.xsd#aal_CargoReceivableFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_ShortTermRevolvingAndOtherFacilitiesMember_02e3b4dd-3370-4025-9d53-4b207f11edca" xlink:to="loc_aal_CargoReceivableFacilityMember_07891837-0096-48cb-8119-1b09d5af3976" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_94a64696-f0f0-49c2-a91e-3ffa87c46308" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_0ca73709-d927-4f4b-b348-50e57aa96d09" xlink:to="loc_srt_StatementScenarioAxis_94a64696-f0f0-49c2-a91e-3ffa87c46308" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_94a64696-f0f0-49c2-a91e-3ffa87c46308_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_94a64696-f0f0-49c2-a91e-3ffa87c46308" xlink:to="loc_srt_ScenarioUnspecifiedDomain_94a64696-f0f0-49c2-a91e-3ffa87c46308_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_766534cb-865d-499a-80a4-f2117759f376" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_94a64696-f0f0-49c2-a91e-3ffa87c46308" xlink:to="loc_srt_ScenarioUnspecifiedDomain_766534cb-865d-499a-80a4-f2117759f376" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_419739c4-1e9d-467f-bc30-e594c6baedfa" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_766534cb-865d-499a-80a4-f2117759f376" xlink:to="loc_srt_ScenarioForecastMember_419739c4-1e9d-467f-bc30-e594c6baedfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_5b20abfd-39cb-4d89-98f4-49cfa2a0b59e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_0ca73709-d927-4f4b-b348-50e57aa96d09" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_5b20abfd-39cb-4d89-98f4-49cfa2a0b59e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5b20abfd-39cb-4d89-98f4-49cfa2a0b59e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5b20abfd-39cb-4d89-98f4-49cfa2a0b59e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5b20abfd-39cb-4d89-98f4-49cfa2a0b59e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_3ccf704a-bdf6-41fc-9051-afb75453d8a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5b20abfd-39cb-4d89-98f4-49cfa2a0b59e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_3ccf704a-bdf6-41fc-9051-afb75453d8a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_a7cca235-559b-4528-8be3-7320b80c871b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_3ccf704a-bdf6-41fc-9051-afb75453d8a5" xlink:to="loc_us-gaap_SecuredDebtMember_a7cca235-559b-4528-8be3-7320b80c871b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_21672570-290e-438f-a103-b39e6f07709d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_ef6ab5fa-f8ee-468e-bc8c-54da1a298b53" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_21672570-290e-438f-a103-b39e6f07709d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_89075928-4acf-4198-b15e-fa28449c4f2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_ef6ab5fa-f8ee-468e-bc8c-54da1a298b53" xlink:to="loc_us-gaap_LineOfCredit_89075928-4acf-4198-b15e-fa28449c4f2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ddae203b-cadd-40ab-808b-85a29dd930a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_ef6ab5fa-f8ee-468e-bc8c-54da1a298b53" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ddae203b-cadd-40ab-808b-85a29dd930a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_019ba4e0-d22f-75af-84fb-baa2ac873232" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_ef6ab5fa-f8ee-468e-bc8c-54da1a298b53" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_019ba4e0-d22f-75af-84fb-baa2ac873232" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtScheduleofMaturitiesofLongTermDebtDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtScheduleofMaturitiesofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtScheduleofMaturitiesofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_51a74219-4fe9-4857-9ce6-78a3e210f194" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_83db6294-1e08-4919-a4cc-cd2b4b8993f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_51a74219-4fe9-4857-9ce6-78a3e210f194" xlink:to="loc_us-gaap_DebtInstrumentTable_83db6294-1e08-4919-a4cc-cd2b4b8993f2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_d16b6942-ab08-4f6b-9ca5-75ac0d8e08b4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_83db6294-1e08-4919-a4cc-cd2b4b8993f2" xlink:to="loc_dei_LegalEntityAxis_d16b6942-ab08-4f6b-9ca5-75ac0d8e08b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d16b6942-ab08-4f6b-9ca5-75ac0d8e08b4_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_d16b6942-ab08-4f6b-9ca5-75ac0d8e08b4" xlink:to="loc_dei_EntityDomain_d16b6942-ab08-4f6b-9ca5-75ac0d8e08b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bee000e7-491c-433c-85b6-afbc0617e70c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_d16b6942-ab08-4f6b-9ca5-75ac0d8e08b4" xlink:to="loc_dei_EntityDomain_bee000e7-491c-433c-85b6-afbc0617e70c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_f5aae1da-be48-4a53-8bff-52d9ebd01036" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_bee000e7-491c-433c-85b6-afbc0617e70c" xlink:to="loc_aal_AmericanAirlinesIncMember_f5aae1da-be48-4a53-8bff-52d9ebd01036" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_07edd257-aa2e-4900-b4db-0e83352356f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MaturitiesOfLongTermDebtAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_51a74219-4fe9-4857-9ce6-78a3e210f194" xlink:to="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_07edd257-aa2e-4900-b4db-0e83352356f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_bf2f7ce3-9778-4682-ac14-f92b03929ef6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_07edd257-aa2e-4900-b4db-0e83352356f5" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_bf2f7ce3-9778-4682-ac14-f92b03929ef6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_b2a96b68-d1b8-41ed-8ca2-38ee68deec3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_07edd257-aa2e-4900-b4db-0e83352356f5" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_b2a96b68-d1b8-41ed-8ca2-38ee68deec3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_4ec33f40-430e-4698-80d0-28d7e9306a6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_07edd257-aa2e-4900-b4db-0e83352356f5" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_4ec33f40-430e-4698-80d0-28d7e9306a6a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_07a73312-5135-4889-a6a9-db2176c9cf70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_07edd257-aa2e-4900-b4db-0e83352356f5" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_07a73312-5135-4889-a6a9-db2176c9cf70" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_9cd13108-4e2c-412c-8955-bf775859e45b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_07edd257-aa2e-4900-b4db-0e83352356f5" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_9cd13108-4e2c-412c-8955-bf775859e45b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_235add6f-0952-4f03-a175-0dc822126acd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_07edd257-aa2e-4900-b4db-0e83352356f5" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_235add6f-0952-4f03-a175-0dc822126acd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_09f863c7-6f98-46f0-b6d8-6162db7b7a6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_07edd257-aa2e-4900-b4db-0e83352356f5" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_09f863c7-6f98-46f0-b6d8-6162db7b7a6f" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/Debt2013CreditFacilitiesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#Debt2013CreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/Debt2013CreditFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_2d680cdc-256e-4f5d-909d-d58865e03caf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_cf9ede05-362e-4b46-a621-96973ac03568" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_2d680cdc-256e-4f5d-909d-d58865e03caf" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_cf9ede05-362e-4b46-a621-96973ac03568" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_1a830379-df43-46a3-86ae-303332c30bfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_cf9ede05-362e-4b46-a621-96973ac03568" xlink:to="loc_us-gaap_CreditFacilityAxis_1a830379-df43-46a3-86ae-303332c30bfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1a830379-df43-46a3-86ae-303332c30bfe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_1a830379-df43-46a3-86ae-303332c30bfe" xlink:to="loc_us-gaap_CreditFacilityDomain_1a830379-df43-46a3-86ae-303332c30bfe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_d7f14178-3c84-4bb4-aa25-1450c347637b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_1a830379-df43-46a3-86ae-303332c30bfe" xlink:to="loc_us-gaap_CreditFacilityDomain_d7f14178-3c84-4bb4-aa25-1450c347637b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_TermLoanMember_019bafcb-e956-7ee7-8623-0491924b6d4e" xlink:href="aal-20251231.xsd#aal_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_d7f14178-3c84-4bb4-aa25-1450c347637b" xlink:to="loc_aal_TermLoanMember_019bafcb-e956-7ee7-8623-0491924b6d4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_fd513358-130f-4170-9bec-d4c27706126f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_d7f14178-3c84-4bb4-aa25-1450c347637b" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_fd513358-130f-4170-9bec-d4c27706126f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_019c2abd-5e2b-7ad3-96dc-1ef13f54b28d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_d7f14178-3c84-4bb4-aa25-1450c347637b" xlink:to="loc_us-gaap_LetterOfCreditMember_019c2abd-5e2b-7ad3-96dc-1ef13f54b28d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_e2d14033-c460-40ac-9669-d986639221c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_cf9ede05-362e-4b46-a621-96973ac03568" xlink:to="loc_us-gaap_DebtInstrumentAxis_e2d14033-c460-40ac-9669-d986639221c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e2d14033-c460-40ac-9669-d986639221c2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_e2d14033-c460-40ac-9669-d986639221c2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e2d14033-c460-40ac-9669-d986639221c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3ade167c-2641-4cc2-b9ae-71808bf4fd4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_e2d14033-c460-40ac-9669-d986639221c2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3ade167c-2641-4cc2-b9ae-71808bf4fd4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CreditFacility2013Member_6e154578-b2f9-44fc-bc2a-d94d75625e44" xlink:href="aal-20251231.xsd#aal_CreditFacility2013Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3ade167c-2641-4cc2-b9ae-71808bf4fd4e" xlink:to="loc_aal_CreditFacility2013Member_6e154578-b2f9-44fc-bc2a-d94d75625e44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_0fd1ba78-825a-4764-b302-5fc95cff00af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_cf9ede05-362e-4b46-a621-96973ac03568" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_0fd1ba78-825a-4764-b302-5fc95cff00af" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0fd1ba78-825a-4764-b302-5fc95cff00af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0fd1ba78-825a-4764-b302-5fc95cff00af" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0fd1ba78-825a-4764-b302-5fc95cff00af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e0922b46-e242-4fb3-8db1-9dfa19f9b5ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0fd1ba78-825a-4764-b302-5fc95cff00af" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e0922b46-e242-4fb3-8db1-9dfa19f9b5ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_1956f6a0-52db-47ad-ac50-77d34bbb3595" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e0922b46-e242-4fb3-8db1-9dfa19f9b5ac" xlink:to="loc_us-gaap_SecuredDebtMember_1956f6a0-52db-47ad-ac50-77d34bbb3595" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_71fab899-e80b-455a-af97-ea18965fb6b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_cf9ede05-362e-4b46-a621-96973ac03568" xlink:to="loc_us-gaap_VariableRateAxis_71fab899-e80b-455a-af97-ea18965fb6b5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_71fab899-e80b-455a-af97-ea18965fb6b5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_71fab899-e80b-455a-af97-ea18965fb6b5" xlink:to="loc_us-gaap_VariableRateDomain_71fab899-e80b-455a-af97-ea18965fb6b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_106f98e4-95f5-407e-b0ac-a3f21709c1a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_71fab899-e80b-455a-af97-ea18965fb6b5" xlink:to="loc_us-gaap_VariableRateDomain_106f98e4-95f5-407e-b0ac-a3f21709c1a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_18809252-8e7a-4f0b-862c-2442e5b7b6be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_106f98e4-95f5-407e-b0ac-a3f21709c1a4" xlink:to="loc_us-gaap_BaseRateMember_18809252-8e7a-4f0b-862c-2442e5b7b6be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_17075e32-4e93-42b8-aed8-0c6425f0a431" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_106f98e4-95f5-407e-b0ac-a3f21709c1a4" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_17075e32-4e93-42b8-aed8-0c6425f0a431" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioAxis_dd99a2d3-221c-4b13-9d89-b8a46dcfed9b" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_cf9ede05-362e-4b46-a621-96973ac03568" xlink:to="loc_aal_InterestRateScenarioAxis_dd99a2d3-221c-4b13-9d89-b8a46dcfed9b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioDomain_dd99a2d3-221c-4b13-9d89-b8a46dcfed9b_default" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_aal_InterestRateScenarioAxis_dd99a2d3-221c-4b13-9d89-b8a46dcfed9b" xlink:to="loc_aal_InterestRateScenarioDomain_dd99a2d3-221c-4b13-9d89-b8a46dcfed9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioDomain_afb70253-4940-4bdb-a7ef-e9c0ef1b906f" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_aal_InterestRateScenarioAxis_dd99a2d3-221c-4b13-9d89-b8a46dcfed9b" xlink:to="loc_aal_InterestRateScenarioDomain_afb70253-4940-4bdb-a7ef-e9c0ef1b906f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateMarginOneMember_c11b9dc9-0f7c-4c69-81ee-c9ee0411037e" xlink:href="aal-20251231.xsd#aal_InterestRateMarginOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_InterestRateScenarioDomain_afb70253-4940-4bdb-a7ef-e9c0ef1b906f" xlink:to="loc_aal_InterestRateMarginOneMember_c11b9dc9-0f7c-4c69-81ee-c9ee0411037e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateMarginTwoMember_17abe31c-581f-4081-b65e-6e5add57dc83" xlink:href="aal-20251231.xsd#aal_InterestRateMarginTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_InterestRateScenarioDomain_afb70253-4940-4bdb-a7ef-e9c0ef1b906f" xlink:to="loc_aal_InterestRateMarginTwoMember_17abe31c-581f-4081-b65e-6e5add57dc83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateMarginThreeMember_0f65fffa-aa3a-4924-9f56-fd9c9089fab7" xlink:href="aal-20251231.xsd#aal_InterestRateMarginThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_InterestRateScenarioDomain_afb70253-4940-4bdb-a7ef-e9c0ef1b906f" xlink:to="loc_aal_InterestRateMarginThreeMember_0f65fffa-aa3a-4924-9f56-fd9c9089fab7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_de111447-3c07-4512-81f5-7c8437100f82" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_cf9ede05-362e-4b46-a621-96973ac03568" xlink:to="loc_dei_LegalEntityAxis_de111447-3c07-4512-81f5-7c8437100f82" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_de111447-3c07-4512-81f5-7c8437100f82_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_de111447-3c07-4512-81f5-7c8437100f82" xlink:to="loc_dei_EntityDomain_de111447-3c07-4512-81f5-7c8437100f82_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_5cefcae5-779a-4303-95a7-97d5ba275d6c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_de111447-3c07-4512-81f5-7c8437100f82" xlink:to="loc_dei_EntityDomain_5cefcae5-779a-4303-95a7-97d5ba275d6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_328d8bc0-8fd8-4de6-83ef-4d937103cb7c" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_5cefcae5-779a-4303-95a7-97d5ba275d6c" xlink:to="loc_aal_AmericanAirlinesIncMember_328d8bc0-8fd8-4de6-83ef-4d937103cb7c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate_29ccf3b9-dd06-4637-b4d2-1746d9483d96" xlink:href="aal-20251231.xsd#aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_2d680cdc-256e-4f5d-909d-d58865e03caf" xlink:to="loc_aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate_29ccf3b9-dd06-4637-b4d2-1746d9483d96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin_133f8594-df8b-41be-9a6f-e2d867a70b74" xlink:href="aal-20251231.xsd#aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_2d680cdc-256e-4f5d-909d-d58865e03caf" xlink:to="loc_aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin_133f8594-df8b-41be-9a6f-e2d867a70b74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019ba4ef-85b4-7605-9e6c-b14dfa0daa72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_2d680cdc-256e-4f5d-909d-d58865e03caf" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019ba4ef-85b4-7605-9e6c-b14dfa0daa72" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LineOfCreditFacilityAccordionFeatureIncreaseLimit_019ba4f1-8baf-7a32-bb2f-316eb1556a5f" xlink:href="aal-20251231.xsd#aal_LineOfCreditFacilityAccordionFeatureIncreaseLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_2d680cdc-256e-4f5d-909d-d58865e03caf" xlink:to="loc_aal_LineOfCreditFacilityAccordionFeatureIncreaseLimit_019ba4f1-8baf-7a32-bb2f-316eb1556a5f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_9b79c764-f28d-49fb-aa9e-bdc3ea638708" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_2d680cdc-256e-4f5d-909d-d58865e03caf" xlink:to="loc_us-gaap_LineOfCredit_9b79c764-f28d-49fb-aa9e-bdc3ea638708" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/Debt2014CreditFacilitiesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#Debt2014CreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/Debt2014CreditFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_78cefc5b-8c8b-4964-b297-a6fc4bd1dd49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_e4b901b9-3585-4b9a-9db8-0c1c1298f397" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_78cefc5b-8c8b-4964-b297-a6fc4bd1dd49" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_e4b901b9-3585-4b9a-9db8-0c1c1298f397" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_d4c5a3f9-f7db-4a92-9420-cfcfd48ef524" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_e4b901b9-3585-4b9a-9db8-0c1c1298f397" xlink:to="loc_us-gaap_CreditFacilityAxis_d4c5a3f9-f7db-4a92-9420-cfcfd48ef524" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_d4c5a3f9-f7db-4a92-9420-cfcfd48ef524_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_d4c5a3f9-f7db-4a92-9420-cfcfd48ef524" xlink:to="loc_us-gaap_CreditFacilityDomain_d4c5a3f9-f7db-4a92-9420-cfcfd48ef524_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_91020202-f7ab-41b6-bf28-3e97b7822fc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_d4c5a3f9-f7db-4a92-9420-cfcfd48ef524" xlink:to="loc_us-gaap_CreditFacilityDomain_91020202-f7ab-41b6-bf28-3e97b7822fc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_TermLoanMember_9713b80b-60ab-4e5e-9128-69b509de048e" xlink:href="aal-20251231.xsd#aal_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_91020202-f7ab-41b6-bf28-3e97b7822fc3" xlink:to="loc_aal_TermLoanMember_9713b80b-60ab-4e5e-9128-69b509de048e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_2a0977da-c49d-4050-a308-6c3510a38f26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_91020202-f7ab-41b6-bf28-3e97b7822fc3" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_2a0977da-c49d-4050-a308-6c3510a38f26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_019c2ad1-d568-79c4-869a-9e3efe7ed7d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_91020202-f7ab-41b6-bf28-3e97b7822fc3" xlink:to="loc_us-gaap_LetterOfCreditMember_019c2ad1-d568-79c4-869a-9e3efe7ed7d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_dff9d236-fc8a-44df-ad38-48efe9796088" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_e4b901b9-3585-4b9a-9db8-0c1c1298f397" xlink:to="loc_us-gaap_DebtInstrumentAxis_dff9d236-fc8a-44df-ad38-48efe9796088" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_dff9d236-fc8a-44df-ad38-48efe9796088_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_dff9d236-fc8a-44df-ad38-48efe9796088" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_dff9d236-fc8a-44df-ad38-48efe9796088_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a2de6203-865d-41ff-961f-efac6ce4cf0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_dff9d236-fc8a-44df-ad38-48efe9796088" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a2de6203-865d-41ff-961f-efac6ce4cf0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CreditFacility2014Member_d5dc967f-3535-4d4a-a078-08305a9ae08b" xlink:href="aal-20251231.xsd#aal_CreditFacility2014Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a2de6203-865d-41ff-961f-efac6ce4cf0b" xlink:to="loc_aal_CreditFacility2014Member_d5dc967f-3535-4d4a-a078-08305a9ae08b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_728f527c-b0ec-4c8f-b76f-a19b4cb11485" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_e4b901b9-3585-4b9a-9db8-0c1c1298f397" xlink:to="loc_us-gaap_VariableRateAxis_728f527c-b0ec-4c8f-b76f-a19b4cb11485" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_728f527c-b0ec-4c8f-b76f-a19b4cb11485_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_728f527c-b0ec-4c8f-b76f-a19b4cb11485" xlink:to="loc_us-gaap_VariableRateDomain_728f527c-b0ec-4c8f-b76f-a19b4cb11485_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_720dd9d2-7ba5-4cdf-acc2-ca117f9677ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_728f527c-b0ec-4c8f-b76f-a19b4cb11485" xlink:to="loc_us-gaap_VariableRateDomain_720dd9d2-7ba5-4cdf-acc2-ca117f9677ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_33643931-7e4b-4f6a-9f7e-c4a83e314a5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_720dd9d2-7ba5-4cdf-acc2-ca117f9677ce" xlink:to="loc_us-gaap_BaseRateMember_33643931-7e4b-4f6a-9f7e-c4a83e314a5e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_f2c0828d-193f-4711-9263-d764d57d073d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_720dd9d2-7ba5-4cdf-acc2-ca117f9677ce" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_f2c0828d-193f-4711-9263-d764d57d073d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_2c6d0a21-d063-4c32-b09c-77fe33970451" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_e4b901b9-3585-4b9a-9db8-0c1c1298f397" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_2c6d0a21-d063-4c32-b09c-77fe33970451" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_2c6d0a21-d063-4c32-b09c-77fe33970451_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2c6d0a21-d063-4c32-b09c-77fe33970451" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_2c6d0a21-d063-4c32-b09c-77fe33970451_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_473b4f1e-220b-428a-9dea-076e0f068f93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2c6d0a21-d063-4c32-b09c-77fe33970451" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_473b4f1e-220b-428a-9dea-076e0f068f93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_81025c72-d3d8-4031-8a68-6231469154fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_473b4f1e-220b-428a-9dea-076e0f068f93" xlink:to="loc_us-gaap_SecuredDebtMember_81025c72-d3d8-4031-8a68-6231469154fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioAxis_ad51c33e-f1ae-4cd1-b864-d187fea9ca3f" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_e4b901b9-3585-4b9a-9db8-0c1c1298f397" xlink:to="loc_aal_InterestRateScenarioAxis_ad51c33e-f1ae-4cd1-b864-d187fea9ca3f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioDomain_ad51c33e-f1ae-4cd1-b864-d187fea9ca3f_default" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_aal_InterestRateScenarioAxis_ad51c33e-f1ae-4cd1-b864-d187fea9ca3f" xlink:to="loc_aal_InterestRateScenarioDomain_ad51c33e-f1ae-4cd1-b864-d187fea9ca3f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioDomain_caab119c-9ac9-404b-8b01-c2c996c68aba" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_aal_InterestRateScenarioAxis_ad51c33e-f1ae-4cd1-b864-d187fea9ca3f" xlink:to="loc_aal_InterestRateScenarioDomain_caab119c-9ac9-404b-8b01-c2c996c68aba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateMarginOneMember_e2e52169-039f-4c46-a7d9-52aa7d81bf95" xlink:href="aal-20251231.xsd#aal_InterestRateMarginOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_InterestRateScenarioDomain_caab119c-9ac9-404b-8b01-c2c996c68aba" xlink:to="loc_aal_InterestRateMarginOneMember_e2e52169-039f-4c46-a7d9-52aa7d81bf95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateMarginTwoMember_a69bb53b-3bf3-4ae6-9d86-09d2423fd57a" xlink:href="aal-20251231.xsd#aal_InterestRateMarginTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_InterestRateScenarioDomain_caab119c-9ac9-404b-8b01-c2c996c68aba" xlink:to="loc_aal_InterestRateMarginTwoMember_a69bb53b-3bf3-4ae6-9d86-09d2423fd57a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateMarginThreeMember_fab928a8-db1f-40ed-9893-d73ea8c109a5" xlink:href="aal-20251231.xsd#aal_InterestRateMarginThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_InterestRateScenarioDomain_caab119c-9ac9-404b-8b01-c2c996c68aba" xlink:to="loc_aal_InterestRateMarginThreeMember_fab928a8-db1f-40ed-9893-d73ea8c109a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_fe643e67-9c36-4f12-b2ed-2459523cd322" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_e4b901b9-3585-4b9a-9db8-0c1c1298f397" xlink:to="loc_dei_LegalEntityAxis_fe643e67-9c36-4f12-b2ed-2459523cd322" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_fe643e67-9c36-4f12-b2ed-2459523cd322_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_fe643e67-9c36-4f12-b2ed-2459523cd322" xlink:to="loc_dei_EntityDomain_fe643e67-9c36-4f12-b2ed-2459523cd322_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6358d079-708d-4da0-875b-9815ddf926c9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_fe643e67-9c36-4f12-b2ed-2459523cd322" xlink:to="loc_dei_EntityDomain_6358d079-708d-4da0-875b-9815ddf926c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_781949a7-cb63-4c4d-b968-3e999759b793" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6358d079-708d-4da0-875b-9815ddf926c9" xlink:to="loc_aal_AmericanAirlinesIncMember_781949a7-cb63-4c4d-b968-3e999759b793" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate_09ec29e3-b64e-4ccf-a97f-0ea209e6ad8b" xlink:href="aal-20251231.xsd#aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_78cefc5b-8c8b-4964-b297-a6fc4bd1dd49" xlink:to="loc_aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate_09ec29e3-b64e-4ccf-a97f-0ea209e6ad8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin_9cc81480-788f-4e0b-b72f-c6dd84abc5a8" xlink:href="aal-20251231.xsd#aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_78cefc5b-8c8b-4964-b297-a6fc4bd1dd49" xlink:to="loc_aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin_9cc81480-788f-4e0b-b72f-c6dd84abc5a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019bafd1-564b-7966-acf7-9249f81c97c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_78cefc5b-8c8b-4964-b297-a6fc4bd1dd49" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019bafd1-564b-7966-acf7-9249f81c97c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LineOfCreditFacilityAccordionFeatureIncreaseLimit_019bafd1-564b-768c-ba62-fcff6347edd3" xlink:href="aal-20251231.xsd#aal_LineOfCreditFacilityAccordionFeatureIncreaseLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_78cefc5b-8c8b-4964-b297-a6fc4bd1dd49" xlink:to="loc_aal_LineOfCreditFacilityAccordionFeatureIncreaseLimit_019bafd1-564b-768c-ba62-fcff6347edd3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_d8c8fe94-0a34-4c12-aabe-5446ad9ab4eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_78cefc5b-8c8b-4964-b297-a6fc4bd1dd49" xlink:to="loc_us-gaap_LineOfCredit_d8c8fe94-0a34-4c12-aabe-5446ad9ab4eb" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/Debt2023CreditFacilitiesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#Debt2023CreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/Debt2023CreditFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_1a398d79-ac26-481b-ab86-bb4fc3e6a415" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_f5060774-9c75-49bb-8d42-39d75ec30dec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_1a398d79-ac26-481b-ab86-bb4fc3e6a415" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_f5060774-9c75-49bb-8d42-39d75ec30dec" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_3514d2b8-9245-4297-a5fc-1764b7943da5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f5060774-9c75-49bb-8d42-39d75ec30dec" xlink:to="loc_us-gaap_CreditFacilityAxis_3514d2b8-9245-4297-a5fc-1764b7943da5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_3514d2b8-9245-4297-a5fc-1764b7943da5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_3514d2b8-9245-4297-a5fc-1764b7943da5" xlink:to="loc_us-gaap_CreditFacilityDomain_3514d2b8-9245-4297-a5fc-1764b7943da5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_48f87ae4-9ff3-4b5b-a146-8fc5bfd7ebcc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_3514d2b8-9245-4297-a5fc-1764b7943da5" xlink:to="loc_us-gaap_CreditFacilityDomain_48f87ae4-9ff3-4b5b-a146-8fc5bfd7ebcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_TermLoanMember_cd635a9c-745a-4c37-a292-f815d1d7f419" xlink:href="aal-20251231.xsd#aal_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_48f87ae4-9ff3-4b5b-a146-8fc5bfd7ebcc" xlink:to="loc_aal_TermLoanMember_cd635a9c-745a-4c37-a292-f815d1d7f419" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_95829875-3231-475a-8153-74e8374acab2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_48f87ae4-9ff3-4b5b-a146-8fc5bfd7ebcc" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_95829875-3231-475a-8153-74e8374acab2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_7677d086-a501-4bb6-b60f-5ad7915819b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f5060774-9c75-49bb-8d42-39d75ec30dec" xlink:to="loc_us-gaap_DebtInstrumentAxis_7677d086-a501-4bb6-b60f-5ad7915819b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7677d086-a501-4bb6-b60f-5ad7915819b1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_7677d086-a501-4bb6-b60f-5ad7915819b1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7677d086-a501-4bb6-b60f-5ad7915819b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_bbb1535a-bdb2-4af1-a41f-748f345d008a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_7677d086-a501-4bb6-b60f-5ad7915819b1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_bbb1535a-bdb2-4af1-a41f-748f345d008a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CreditFacility2023Member_c0b6e6f9-68f7-4bba-8421-bf55d398d897" xlink:href="aal-20251231.xsd#aal_CreditFacility2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_bbb1535a-bdb2-4af1-a41f-748f345d008a" xlink:to="loc_aal_CreditFacility2023Member_c0b6e6f9-68f7-4bba-8421-bf55d398d897" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_6a5c3944-3aeb-48dc-bd4e-a8d7207a25fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f5060774-9c75-49bb-8d42-39d75ec30dec" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_6a5c3944-3aeb-48dc-bd4e-a8d7207a25fe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6a5c3944-3aeb-48dc-bd4e-a8d7207a25fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6a5c3944-3aeb-48dc-bd4e-a8d7207a25fe" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_6a5c3944-3aeb-48dc-bd4e-a8d7207a25fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_64b16830-0313-4c0a-9dcc-19692b2959ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6a5c3944-3aeb-48dc-bd4e-a8d7207a25fe" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_64b16830-0313-4c0a-9dcc-19692b2959ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_a3869681-5612-464c-bdad-a02fb40954bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_64b16830-0313-4c0a-9dcc-19692b2959ef" xlink:to="loc_us-gaap_SecuredDebtMember_a3869681-5612-464c-bdad-a02fb40954bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_db8bcacb-4201-4652-b59e-6cdfcad493f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f5060774-9c75-49bb-8d42-39d75ec30dec" xlink:to="loc_us-gaap_VariableRateAxis_db8bcacb-4201-4652-b59e-6cdfcad493f6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_db8bcacb-4201-4652-b59e-6cdfcad493f6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_db8bcacb-4201-4652-b59e-6cdfcad493f6" xlink:to="loc_us-gaap_VariableRateDomain_db8bcacb-4201-4652-b59e-6cdfcad493f6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_1a366ab5-bac1-41cd-8705-e32ab20d2297" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_db8bcacb-4201-4652-b59e-6cdfcad493f6" xlink:to="loc_us-gaap_VariableRateDomain_1a366ab5-bac1-41cd-8705-e32ab20d2297" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_4c38e28f-5b57-4798-aeb6-0c22e20e195d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_1a366ab5-bac1-41cd-8705-e32ab20d2297" xlink:to="loc_us-gaap_BaseRateMember_4c38e28f-5b57-4798-aeb6-0c22e20e195d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_77d23ec0-51dd-4b99-ae55-bf1f8bd3329f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_1a366ab5-bac1-41cd-8705-e32ab20d2297" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_77d23ec0-51dd-4b99-ae55-bf1f8bd3329f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioAxis_f168c966-9c09-4c8a-9127-f5302caf2ad3" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f5060774-9c75-49bb-8d42-39d75ec30dec" xlink:to="loc_aal_InterestRateScenarioAxis_f168c966-9c09-4c8a-9127-f5302caf2ad3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioDomain_f168c966-9c09-4c8a-9127-f5302caf2ad3_default" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_aal_InterestRateScenarioAxis_f168c966-9c09-4c8a-9127-f5302caf2ad3" xlink:to="loc_aal_InterestRateScenarioDomain_f168c966-9c09-4c8a-9127-f5302caf2ad3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioDomain_23d98d19-446b-4122-9a00-53e14480e3ce" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_aal_InterestRateScenarioAxis_f168c966-9c09-4c8a-9127-f5302caf2ad3" xlink:to="loc_aal_InterestRateScenarioDomain_23d98d19-446b-4122-9a00-53e14480e3ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateMarginOneMember_dc1a9fb8-504d-4d39-abe8-58e52aa8830c" xlink:href="aal-20251231.xsd#aal_InterestRateMarginOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_InterestRateScenarioDomain_23d98d19-446b-4122-9a00-53e14480e3ce" xlink:to="loc_aal_InterestRateMarginOneMember_dc1a9fb8-504d-4d39-abe8-58e52aa8830c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateMarginTwoMember_ec62d5bf-9f2c-439f-bf00-d72a353afb50" xlink:href="aal-20251231.xsd#aal_InterestRateMarginTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_InterestRateScenarioDomain_23d98d19-446b-4122-9a00-53e14480e3ce" xlink:to="loc_aal_InterestRateMarginTwoMember_ec62d5bf-9f2c-439f-bf00-d72a353afb50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateMarginThreeMember_ad592e59-de90-4585-8769-3c494d557453" xlink:href="aal-20251231.xsd#aal_InterestRateMarginThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_InterestRateScenarioDomain_23d98d19-446b-4122-9a00-53e14480e3ce" xlink:to="loc_aal_InterestRateMarginThreeMember_ad592e59-de90-4585-8769-3c494d557453" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_94fc41ba-4a24-4dc0-bb90-6717dc8c60d3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f5060774-9c75-49bb-8d42-39d75ec30dec" xlink:to="loc_dei_LegalEntityAxis_94fc41ba-4a24-4dc0-bb90-6717dc8c60d3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_94fc41ba-4a24-4dc0-bb90-6717dc8c60d3_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_94fc41ba-4a24-4dc0-bb90-6717dc8c60d3" xlink:to="loc_dei_EntityDomain_94fc41ba-4a24-4dc0-bb90-6717dc8c60d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_17fd2e47-22bb-47f8-b49d-b88dab5c3821" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_94fc41ba-4a24-4dc0-bb90-6717dc8c60d3" xlink:to="loc_dei_EntityDomain_17fd2e47-22bb-47f8-b49d-b88dab5c3821" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_98e6043b-16c6-4803-a14f-33d96ba9eead" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_17fd2e47-22bb-47f8-b49d-b88dab5c3821" xlink:to="loc_aal_AmericanAirlinesIncMember_98e6043b-16c6-4803-a14f-33d96ba9eead" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate_96f981e7-1f0a-4145-abe2-b9f4c2007947" xlink:href="aal-20251231.xsd#aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_1a398d79-ac26-481b-ab86-bb4fc3e6a415" xlink:to="loc_aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate_96f981e7-1f0a-4145-abe2-b9f4c2007947" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin_d894cfc9-8a55-40bc-9b6d-d018136fa24e" xlink:href="aal-20251231.xsd#aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_1a398d79-ac26-481b-ab86-bb4fc3e6a415" xlink:to="loc_aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin_d894cfc9-8a55-40bc-9b6d-d018136fa24e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019bafd8-5646-777a-874a-0c506a5080c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_1a398d79-ac26-481b-ab86-bb4fc3e6a415" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019bafd8-5646-777a-874a-0c506a5080c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_a25f4bb2-a604-4a4c-9b95-a0f67d6b48ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_1a398d79-ac26-481b-ab86-bb4fc3e6a415" xlink:to="loc_us-gaap_LineOfCredit_a25f4bb2-a604-4a4c-9b95-a0f67d6b48ef" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtOtherTermsofthe20132014and2023CreditFacilitiesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtOtherTermsofthe20132014and2023CreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtOtherTermsofthe20132014and2023CreditFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_a9d5bd87-c456-40e2-b04f-a8636e51fbc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_34029366-3394-4e86-95d1-c151ab988b3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a9d5bd87-c456-40e2-b04f-a8636e51fbc0" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_34029366-3394-4e86-95d1-c151ab988b3a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_fb7c257f-3a91-4c89-9407-b66128589b57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_34029366-3394-4e86-95d1-c151ab988b3a" xlink:to="loc_us-gaap_DebtInstrumentAxis_fb7c257f-3a91-4c89-9407-b66128589b57" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_fb7c257f-3a91-4c89-9407-b66128589b57_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_fb7c257f-3a91-4c89-9407-b66128589b57" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_fb7c257f-3a91-4c89-9407-b66128589b57_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1d74758a-0b7b-48ad-9210-ed9c723dfeb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_fb7c257f-3a91-4c89-9407-b66128589b57" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1d74758a-0b7b-48ad-9210-ed9c723dfeb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CreditFacilitiesMember_4c2314dd-c03d-4a7f-80e1-4679900b2a15" xlink:href="aal-20251231.xsd#aal_CreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1d74758a-0b7b-48ad-9210-ed9c723dfeb0" xlink:to="loc_aal_CreditFacilitiesMember_4c2314dd-c03d-4a7f-80e1-4679900b2a15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_0598c214-4161-4c7a-a392-4448609592d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_34029366-3394-4e86-95d1-c151ab988b3a" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_0598c214-4161-4c7a-a392-4448609592d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0598c214-4161-4c7a-a392-4448609592d0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0598c214-4161-4c7a-a392-4448609592d0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0598c214-4161-4c7a-a392-4448609592d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01f24bb9-bb69-4bd5-87ec-cd43d2cf5e13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0598c214-4161-4c7a-a392-4448609592d0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01f24bb9-bb69-4bd5-87ec-cd43d2cf5e13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_f8eba980-4246-4392-bbf5-20a9cf875d6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01f24bb9-bb69-4bd5-87ec-cd43d2cf5e13" xlink:to="loc_us-gaap_SecuredDebtMember_f8eba980-4246-4392-bbf5-20a9cf875d6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_747bbf5b-d7af-47d7-9242-943bfc1c38cd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_34029366-3394-4e86-95d1-c151ab988b3a" xlink:to="loc_dei_LegalEntityAxis_747bbf5b-d7af-47d7-9242-943bfc1c38cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_747bbf5b-d7af-47d7-9242-943bfc1c38cd_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_747bbf5b-d7af-47d7-9242-943bfc1c38cd" xlink:to="loc_dei_EntityDomain_747bbf5b-d7af-47d7-9242-943bfc1c38cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_9dfb007a-dafd-4735-aca6-a1f2621caa9b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_747bbf5b-d7af-47d7-9242-943bfc1c38cd" xlink:to="loc_dei_EntityDomain_9dfb007a-dafd-4735-aca6-a1f2621caa9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_115111b6-66e5-47a3-b14b-03df0e0cbb72" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_9dfb007a-dafd-4735-aca6-a1f2621caa9b" xlink:to="loc_aal_AmericanAirlinesIncMember_115111b6-66e5-47a3-b14b-03df0e0cbb72" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_e3fd5d33-3285-4dd9-b79f-3a8c81194b42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_34029366-3394-4e86-95d1-c151ab988b3a" xlink:to="loc_us-gaap_CreditFacilityAxis_e3fd5d33-3285-4dd9-b79f-3a8c81194b42" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_e3fd5d33-3285-4dd9-b79f-3a8c81194b42_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_e3fd5d33-3285-4dd9-b79f-3a8c81194b42" xlink:to="loc_us-gaap_CreditFacilityDomain_e3fd5d33-3285-4dd9-b79f-3a8c81194b42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_124e1622-88b6-435d-8436-404f79e5860d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_e3fd5d33-3285-4dd9-b79f-3a8c81194b42" xlink:to="loc_us-gaap_CreditFacilityDomain_124e1622-88b6-435d-8436-404f79e5860d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_01682a85-c62a-40ac-901f-4b28281297a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_124e1622-88b6-435d-8436-404f79e5860d" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_01682a85-c62a-40ac-901f-4b28281297a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentAnnualRepaymentPercentOfPrincipalBalance_8a2e9d9d-033e-4906-9823-6cf9124abcbf" xlink:href="aal-20251231.xsd#aal_DebtInstrumentAnnualRepaymentPercentOfPrincipalBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a9d5bd87-c456-40e2-b04f-a8636e51fbc0" xlink:to="loc_aal_DebtInstrumentAnnualRepaymentPercentOfPrincipalBalance_8a2e9d9d-033e-4906-9823-6cf9124abcbf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_ba41ec32-a7ec-4697-9ff0-9237b52f5050" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a9d5bd87-c456-40e2-b04f-a8636e51fbc0" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_ba41ec32-a7ec-4697-9ff0-9237b52f5050" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/Debt1075SeniorSecuredNotesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#Debt1075SeniorSecuredNotesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/Debt1075SeniorSecuredNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_be4815e4-8f2b-4ef5-bf36-e7d94d9896be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_a8fc6e76-f457-4d88-ba83-fb46d87b1548" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_be4815e4-8f2b-4ef5-bf36-e7d94d9896be" xlink:to="loc_us-gaap_DebtInstrumentTable_a8fc6e76-f457-4d88-ba83-fb46d87b1548" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_6a90925a-5479-4e63-9556-fe67fab833d0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a8fc6e76-f457-4d88-ba83-fb46d87b1548" xlink:to="loc_dei_LegalEntityAxis_6a90925a-5479-4e63-9556-fe67fab833d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6a90925a-5479-4e63-9556-fe67fab833d0_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_6a90925a-5479-4e63-9556-fe67fab833d0" xlink:to="loc_dei_EntityDomain_6a90925a-5479-4e63-9556-fe67fab833d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_126fa517-ae01-458f-b646-9bc306494c2f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_6a90925a-5479-4e63-9556-fe67fab833d0" xlink:to="loc_dei_EntityDomain_126fa517-ae01-458f-b646-9bc306494c2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_d91589fb-2545-491e-b644-4068723b065f" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_126fa517-ae01-458f-b646-9bc306494c2f" xlink:to="loc_aal_AmericanAirlinesIncMember_d91589fb-2545-491e-b644-4068723b065f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_e5f52892-8898-456c-8433-d5f659a45bc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a8fc6e76-f457-4d88-ba83-fb46d87b1548" xlink:to="loc_us-gaap_DebtInstrumentAxis_e5f52892-8898-456c-8433-d5f659a45bc2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e5f52892-8898-456c-8433-d5f659a45bc2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_e5f52892-8898-456c-8433-d5f659a45bc2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e5f52892-8898-456c-8433-d5f659a45bc2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ea1f4a5c-d293-4761-9060-eb4e57b222b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_e5f52892-8898-456c-8433-d5f659a45bc2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ea1f4a5c-d293-4761-9060-eb4e57b222b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A1075SeniorSecuredNotesMember_6902a1a3-21d9-4262-a228-6351ec31a421" xlink:href="aal-20251231.xsd#aal_A1075SeniorSecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ea1f4a5c-d293-4761-9060-eb4e57b222b9" xlink:to="loc_aal_A1075SeniorSecuredNotesMember_6902a1a3-21d9-4262-a228-6351ec31a421" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A1075SeniorSecuredNotesIPNotesMember_08db29cc-cad1-4f99-ba61-e99d0d3b6d45" xlink:href="aal-20251231.xsd#aal_A1075SeniorSecuredNotesIPNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_A1075SeniorSecuredNotesMember_6902a1a3-21d9-4262-a228-6351ec31a421" xlink:to="loc_aal_A1075SeniorSecuredNotesIPNotesMember_08db29cc-cad1-4f99-ba61-e99d0d3b6d45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A1075SeniorSecuredNotesLGADCANotesMember_2e67b96f-95d3-4a84-b526-79eb8169b8fb" xlink:href="aal-20251231.xsd#aal_A1075SeniorSecuredNotesLGADCANotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_A1075SeniorSecuredNotesMember_6902a1a3-21d9-4262-a228-6351ec31a421" xlink:to="loc_aal_A1075SeniorSecuredNotesLGADCANotesMember_2e67b96f-95d3-4a84-b526-79eb8169b8fb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_81b8ed5f-d965-430d-8748-abf4021c560b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a8fc6e76-f457-4d88-ba83-fb46d87b1548" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_81b8ed5f-d965-430d-8748-abf4021c560b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_81b8ed5f-d965-430d-8748-abf4021c560b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_81b8ed5f-d965-430d-8748-abf4021c560b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_81b8ed5f-d965-430d-8748-abf4021c560b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_db02ede1-ebe3-4534-9aef-6f6f39a02243" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_81b8ed5f-d965-430d-8748-abf4021c560b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_db02ede1-ebe3-4534-9aef-6f6f39a02243" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_ee9f3405-3721-480e-a8e6-a4a8502ea894" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_db02ede1-ebe3-4534-9aef-6f6f39a02243" xlink:to="loc_us-gaap_SeniorNotesMember_ee9f3405-3721-480e-a8e6-a4a8502ea894" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentInKindPIKNoteMember_0fc41b54-f1b5-4d43-9fbc-deb82312ff3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentInKindPIKNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_db02ede1-ebe3-4534-9aef-6f6f39a02243" xlink:to="loc_us-gaap_PaymentInKindPIKNoteMember_0fc41b54-f1b5-4d43-9fbc-deb82312ff3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_27fc1156-cf6c-4ab3-a7f6-4e53a8fd9dca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_be4815e4-8f2b-4ef5-bf36-e7d94d9896be" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_27fc1156-cf6c-4ab3-a7f6-4e53a8fd9dca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_d9715cc1-e94f-445f-a1d8-6e69af347d42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_be4815e4-8f2b-4ef5-bf36-e7d94d9896be" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_d9715cc1-e94f-445f-a1d8-6e69af347d42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_019c2a72-1810-7711-8d03-9a69c018618c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_be4815e4-8f2b-4ef5-bf36-e7d94d9896be" xlink:to="loc_us-gaap_RepaymentsOfDebt_019c2a72-1810-7711-8d03-9a69c018618c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_019bb864-ea2d-7182-ba3b-7b76003f9742" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_be4815e4-8f2b-4ef5-bf36-e7d94d9896be" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_019bb864-ea2d-7182-ba3b-7b76003f9742" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/Debt725SeniorSecuredNotesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#Debt725SeniorSecuredNotesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/Debt725SeniorSecuredNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_54b265bc-b734-450c-b9cd-ec0d9309e71b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_06cf20b5-d7df-4015-a5c3-72f4f40cf11b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_54b265bc-b734-450c-b9cd-ec0d9309e71b" xlink:to="loc_us-gaap_DebtInstrumentTable_06cf20b5-d7df-4015-a5c3-72f4f40cf11b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_9ac9585a-aade-4e84-8106-b97c45230a0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_06cf20b5-d7df-4015-a5c3-72f4f40cf11b" xlink:to="loc_us-gaap_DebtInstrumentAxis_9ac9585a-aade-4e84-8106-b97c45230a0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_9ac9585a-aade-4e84-8106-b97c45230a0b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_9ac9585a-aade-4e84-8106-b97c45230a0b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_9ac9585a-aade-4e84-8106-b97c45230a0b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_55b3b1d1-d791-49f0-80fc-4e401b04b049" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_9ac9585a-aade-4e84-8106-b97c45230a0b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_55b3b1d1-d791-49f0-80fc-4e401b04b049" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A725SeniorSecuredNotesDue2028Member_61f481f3-8395-476f-b4bf-30db616aaaca" xlink:href="aal-20251231.xsd#aal_A725SeniorSecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_55b3b1d1-d791-49f0-80fc-4e401b04b049" xlink:to="loc_aal_A725SeniorSecuredNotesDue2028Member_61f481f3-8395-476f-b4bf-30db616aaaca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_2b72f757-270b-4213-af59-2a816c14a6af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_06cf20b5-d7df-4015-a5c3-72f4f40cf11b" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_2b72f757-270b-4213-af59-2a816c14a6af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_2b72f757-270b-4213-af59-2a816c14a6af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2b72f757-270b-4213-af59-2a816c14a6af" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_2b72f757-270b-4213-af59-2a816c14a6af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b655daa0-eda7-4a90-abb0-fef402979720" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2b72f757-270b-4213-af59-2a816c14a6af" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b655daa0-eda7-4a90-abb0-fef402979720" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_3c8bc53c-93e7-46d2-b546-0c55356b88e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b655daa0-eda7-4a90-abb0-fef402979720" xlink:to="loc_us-gaap_SeniorNotesMember_3c8bc53c-93e7-46d2-b546-0c55356b88e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_c550b10c-661f-477a-8d68-1fa68a53e983" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_06cf20b5-d7df-4015-a5c3-72f4f40cf11b" xlink:to="loc_dei_LegalEntityAxis_c550b10c-661f-477a-8d68-1fa68a53e983" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_c550b10c-661f-477a-8d68-1fa68a53e983_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_c550b10c-661f-477a-8d68-1fa68a53e983" xlink:to="loc_dei_EntityDomain_c550b10c-661f-477a-8d68-1fa68a53e983_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e51b2270-2f6d-46ed-b854-5ee9327d2fc0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_c550b10c-661f-477a-8d68-1fa68a53e983" xlink:to="loc_dei_EntityDomain_e51b2270-2f6d-46ed-b854-5ee9327d2fc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_d990348d-1fb1-4591-977d-758637ff5e50" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_e51b2270-2f6d-46ed-b854-5ee9327d2fc0" xlink:to="loc_aal_AmericanAirlinesIncMember_d990348d-1fb1-4591-977d-758637ff5e50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c1ad1b25-fced-4581-9018-874fab7538d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_54b265bc-b734-450c-b9cd-ec0d9309e71b" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c1ad1b25-fced-4581-9018-874fab7538d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_be8fd91f-5f02-40cf-98f0-6fff22205eb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_54b265bc-b734-450c-b9cd-ec0d9309e71b" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_be8fd91f-5f02-40cf-98f0-6fff22205eb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentCovenantTermsMinimumCollateralCoverageRatio_e078a691-79c2-42d3-8307-297f387c987e" xlink:href="aal-20251231.xsd#aal_DebtInstrumentCovenantTermsMinimumCollateralCoverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_54b265bc-b734-450c-b9cd-ec0d9309e71b" xlink:to="loc_aal_DebtInstrumentCovenantTermsMinimumCollateralCoverageRatio_e078a691-79c2-42d3-8307-297f387c987e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentSpecialInterestRate_fbf2c0dd-8e65-4150-8ccb-f548c05ac472" xlink:href="aal-20251231.xsd#aal_DebtInstrumentSpecialInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_54b265bc-b734-450c-b9cd-ec0d9309e71b" xlink:to="loc_aal_DebtInstrumentSpecialInterestRate_fbf2c0dd-8e65-4150-8ccb-f548c05ac472" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/Debt850SeniorSecuredNotesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#Debt850SeniorSecuredNotesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/Debt850SeniorSecuredNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_d4355480-4d3b-4175-b1ff-f324ee91fcfb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_a20a2acd-fff5-4c93-baa8-b0e9a29fa437" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d4355480-4d3b-4175-b1ff-f324ee91fcfb" xlink:to="loc_us-gaap_DebtInstrumentTable_a20a2acd-fff5-4c93-baa8-b0e9a29fa437" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_edc1a029-a6c1-4e79-b9c3-0e70bb7e1c5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a20a2acd-fff5-4c93-baa8-b0e9a29fa437" xlink:to="loc_us-gaap_DebtInstrumentAxis_edc1a029-a6c1-4e79-b9c3-0e70bb7e1c5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_edc1a029-a6c1-4e79-b9c3-0e70bb7e1c5c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_edc1a029-a6c1-4e79-b9c3-0e70bb7e1c5c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_edc1a029-a6c1-4e79-b9c3-0e70bb7e1c5c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_8b041554-1184-4107-9dfa-1770c91a0ac7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_edc1a029-a6c1-4e79-b9c3-0e70bb7e1c5c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_8b041554-1184-4107-9dfa-1770c91a0ac7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A850SeniorSecuredNotesDue2029Member_9f9c3881-8657-42d2-839b-7574b121a050" xlink:href="aal-20251231.xsd#aal_A850SeniorSecuredNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8b041554-1184-4107-9dfa-1770c91a0ac7" xlink:to="loc_aal_A850SeniorSecuredNotesDue2029Member_9f9c3881-8657-42d2-839b-7574b121a050" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_cddd0c51-721e-4187-abc2-c99e8241a21e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a20a2acd-fff5-4c93-baa8-b0e9a29fa437" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_cddd0c51-721e-4187-abc2-c99e8241a21e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_cddd0c51-721e-4187-abc2-c99e8241a21e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cddd0c51-721e-4187-abc2-c99e8241a21e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_cddd0c51-721e-4187-abc2-c99e8241a21e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e08c4382-34e6-4b59-b219-97e37be327f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cddd0c51-721e-4187-abc2-c99e8241a21e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e08c4382-34e6-4b59-b219-97e37be327f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_a32d6e33-6257-49ae-b950-75008e464a9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e08c4382-34e6-4b59-b219-97e37be327f1" xlink:to="loc_us-gaap_SeniorNotesMember_a32d6e33-6257-49ae-b950-75008e464a9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_39256f5e-58b2-4424-aa27-efcfe825f5d5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a20a2acd-fff5-4c93-baa8-b0e9a29fa437" xlink:to="loc_dei_LegalEntityAxis_39256f5e-58b2-4424-aa27-efcfe825f5d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_39256f5e-58b2-4424-aa27-efcfe825f5d5_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_39256f5e-58b2-4424-aa27-efcfe825f5d5" xlink:to="loc_dei_EntityDomain_39256f5e-58b2-4424-aa27-efcfe825f5d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bd07fdf9-93de-48e0-b7d2-8eb2baa36209" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_39256f5e-58b2-4424-aa27-efcfe825f5d5" xlink:to="loc_dei_EntityDomain_bd07fdf9-93de-48e0-b7d2-8eb2baa36209" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_22c7c711-1c75-4a73-ad2b-bb8e033d7d6a" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_bd07fdf9-93de-48e0-b7d2-8eb2baa36209" xlink:to="loc_aal_AmericanAirlinesIncMember_22c7c711-1c75-4a73-ad2b-bb8e033d7d6a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ab2c42fb-6374-46eb-a4bf-5db4bf1197a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d4355480-4d3b-4175-b1ff-f324ee91fcfb" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ab2c42fb-6374-46eb-a4bf-5db4bf1197a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_21b64da4-05a9-4156-b2ad-1adf89fe1131" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d4355480-4d3b-4175-b1ff-f324ee91fcfb" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_21b64da4-05a9-4156-b2ad-1adf89fe1131" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentCovenantTermsMinimumCollateralCoverageRatio_1a8d5816-aeae-4fc8-90cb-2942a62860af" xlink:href="aal-20251231.xsd#aal_DebtInstrumentCovenantTermsMinimumCollateralCoverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d4355480-4d3b-4175-b1ff-f324ee91fcfb" xlink:to="loc_aal_DebtInstrumentCovenantTermsMinimumCollateralCoverageRatio_1a8d5816-aeae-4fc8-90cb-2942a62860af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentSpecialInterestRate_0dccd73f-06a0-4db4-9870-65a5ef13c7b2" xlink:href="aal-20251231.xsd#aal_DebtInstrumentSpecialInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d4355480-4d3b-4175-b1ff-f324ee91fcfb" xlink:to="loc_aal_DebtInstrumentSpecialInterestRate_0dccd73f-06a0-4db4-9870-65a5ef13c7b2" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtAAdvantageFinancingDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtAAdvantageFinancingDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtAAdvantageFinancingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_c67f5a01-1971-482d-8314-991e4cac4c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_us-gaap_DebtInstrumentTable_c67f5a01-1971-482d-8314-991e4cac4c5a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_864ea716-c66d-4987-85f2-3c30769e7294" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c67f5a01-1971-482d-8314-991e4cac4c5a" xlink:to="loc_us-gaap_DebtInstrumentAxis_864ea716-c66d-4987-85f2-3c30769e7294" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_864ea716-c66d-4987-85f2-3c30769e7294_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_864ea716-c66d-4987-85f2-3c30769e7294" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_864ea716-c66d-4987-85f2-3c30769e7294_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_09ed6a43-5538-44de-9041-3794ba77bcfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_864ea716-c66d-4987-85f2-3c30769e7294" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_09ed6a43-5538-44de-9041-3794ba77bcfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SeniorNote550Matures2026Member_ce8f914c-2774-4287-8b76-4ec0a909de54" xlink:href="aal-20251231.xsd#aal_SeniorNote550Matures2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_09ed6a43-5538-44de-9041-3794ba77bcfe" xlink:to="loc_aal_SeniorNote550Matures2026Member_ce8f914c-2774-4287-8b76-4ec0a909de54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SeniorNote575Matures2029Member_5bf68a1e-4ef3-453f-a530-c50c9c074eda" xlink:href="aal-20251231.xsd#aal_SeniorNote575Matures2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_09ed6a43-5538-44de-9041-3794ba77bcfe" xlink:to="loc_aal_SeniorNote575Matures2029Member_5bf68a1e-4ef3-453f-a530-c50c9c074eda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AAdvantageTermLoanFacilityMember_46c07485-9961-42ac-9a03-be551f8ccbcb" xlink:href="aal-20251231.xsd#aal_AAdvantageTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_09ed6a43-5538-44de-9041-3794ba77bcfe" xlink:to="loc_aal_AAdvantageTermLoanFacilityMember_46c07485-9961-42ac-9a03-be551f8ccbcb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A2021AAdvantageTermLoanFacilityMember_019baffc-d860-7572-a3be-eea79311f9bc" xlink:href="aal-20251231.xsd#aal_A2021AAdvantageTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AAdvantageTermLoanFacilityMember_46c07485-9961-42ac-9a03-be551f8ccbcb" xlink:to="loc_aal_A2021AAdvantageTermLoanFacilityMember_019baffc-d860-7572-a3be-eea79311f9bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AAdvantageTermLoanFacilitySecondAmendmentMember_019baff0-3be5-705e-b4f9-0c64b4abd3fa" xlink:href="aal-20251231.xsd#aal_AAdvantageTermLoanFacilitySecondAmendmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AAdvantageTermLoanFacilityMember_46c07485-9961-42ac-9a03-be551f8ccbcb" xlink:to="loc_aal_AAdvantageTermLoanFacilitySecondAmendmentMember_019baff0-3be5-705e-b4f9-0c64b4abd3fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A2025AAdvantageTermLoanFacilityMember_019baff3-821e-7e36-87d2-d2185b176048" xlink:href="aal-20251231.xsd#aal_A2025AAdvantageTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AAdvantageTermLoanFacilityMember_46c07485-9961-42ac-9a03-be551f8ccbcb" xlink:to="loc_aal_A2025AAdvantageTermLoanFacilityMember_019baff3-821e-7e36-87d2-d2185b176048" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AAdvantageTermLoanFacilityThirdAmendmentMember_019baff3-821e-729c-ace5-6f8337c53714" xlink:href="aal-20251231.xsd#aal_AAdvantageTermLoanFacilityThirdAmendmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AAdvantageTermLoanFacilityMember_46c07485-9961-42ac-9a03-be551f8ccbcb" xlink:to="loc_aal_AAdvantageTermLoanFacilityThirdAmendmentMember_019baff3-821e-729c-ace5-6f8337c53714" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ConvertibleSeniorNotes650Due2025Member_019bb445-92ea-766d-836d-fac7a8a523c3" xlink:href="aal-20251231.xsd#aal_ConvertibleSeniorNotes650Due2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_09ed6a43-5538-44de-9041-3794ba77bcfe" xlink:to="loc_aal_ConvertibleSeniorNotes650Due2025Member_019bb445-92ea-766d-836d-fac7a8a523c3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_165d803b-56f3-4953-908e-cd32d7c39cd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c67f5a01-1971-482d-8314-991e4cac4c5a" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_165d803b-56f3-4953-908e-cd32d7c39cd2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_165d803b-56f3-4953-908e-cd32d7c39cd2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_165d803b-56f3-4953-908e-cd32d7c39cd2" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_165d803b-56f3-4953-908e-cd32d7c39cd2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_7cb6ae23-d7b0-4204-b355-c4360422a4a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_165d803b-56f3-4953-908e-cd32d7c39cd2" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_7cb6ae23-d7b0-4204-b355-c4360422a4a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_8bcb7cf7-9b9e-4f80-bd14-9bf771d55ef6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7cb6ae23-d7b0-4204-b355-c4360422a4a2" xlink:to="loc_us-gaap_SeniorNotesMember_8bcb7cf7-9b9e-4f80-bd14-9bf771d55ef6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_324e3b00-d9cb-4ba1-b7c2-2df338ac4d67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7cb6ae23-d7b0-4204-b355-c4360422a4a2" xlink:to="loc_us-gaap_SecuredDebtMember_324e3b00-d9cb-4ba1-b7c2-2df338ac4d67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_8c7b6c65-2287-4ffe-a26f-cab75a4e6b37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c67f5a01-1971-482d-8314-991e4cac4c5a" xlink:to="loc_us-gaap_VariableRateAxis_8c7b6c65-2287-4ffe-a26f-cab75a4e6b37" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_8c7b6c65-2287-4ffe-a26f-cab75a4e6b37_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_8c7b6c65-2287-4ffe-a26f-cab75a4e6b37" xlink:to="loc_us-gaap_VariableRateDomain_8c7b6c65-2287-4ffe-a26f-cab75a4e6b37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_0be9f3ee-87c2-4173-a3f7-d4c78d8489d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_8c7b6c65-2287-4ffe-a26f-cab75a4e6b37" xlink:to="loc_us-gaap_VariableRateDomain_0be9f3ee-87c2-4173-a3f7-d4c78d8489d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_f6b82892-cdb1-4025-b18d-504bc5d298e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_0be9f3ee-87c2-4173-a3f7-d4c78d8489d4" xlink:to="loc_us-gaap_BaseRateMember_f6b82892-cdb1-4025-b18d-504bc5d298e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_e8cc3a26-aea5-41e2-84da-d54a978c30fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_0be9f3ee-87c2-4173-a3f7-d4c78d8489d4" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_e8cc3a26-aea5-41e2-84da-d54a978c30fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_5660b24b-a7c8-4ac0-b24f-b9684d4561a2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c67f5a01-1971-482d-8314-991e4cac4c5a" xlink:to="loc_srt_StatementScenarioAxis_5660b24b-a7c8-4ac0-b24f-b9684d4561a2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_5660b24b-a7c8-4ac0-b24f-b9684d4561a2_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_5660b24b-a7c8-4ac0-b24f-b9684d4561a2" xlink:to="loc_srt_ScenarioUnspecifiedDomain_5660b24b-a7c8-4ac0-b24f-b9684d4561a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_45cd66c2-e752-4e84-8aa0-c8a2cb23ec15" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_5660b24b-a7c8-4ac0-b24f-b9684d4561a2" xlink:to="loc_srt_ScenarioUnspecifiedDomain_45cd66c2-e752-4e84-8aa0-c8a2cb23ec15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_0496f076-04cf-4738-88c4-a2a93326e907" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_45cd66c2-e752-4e84-8aa0-c8a2cb23ec15" xlink:to="loc_srt_ScenarioForecastMember_0496f076-04cf-4738-88c4-a2a93326e907" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_482b4342-7e03-4462-b243-529bac933371" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c67f5a01-1971-482d-8314-991e4cac4c5a" xlink:to="loc_dei_LegalEntityAxis_482b4342-7e03-4462-b243-529bac933371" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_482b4342-7e03-4462-b243-529bac933371_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_482b4342-7e03-4462-b243-529bac933371" xlink:to="loc_dei_EntityDomain_482b4342-7e03-4462-b243-529bac933371_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_14f5e0bb-633f-4af1-9739-7b314da289e3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_482b4342-7e03-4462-b243-529bac933371" xlink:to="loc_dei_EntityDomain_14f5e0bb-633f-4af1-9739-7b314da289e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_a2aadfd2-dcbd-4d9c-8c6c-43e6631ad951" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_14f5e0bb-633f-4af1-9739-7b314da289e3" xlink:to="loc_aal_AmericanAirlinesIncMember_a2aadfd2-dcbd-4d9c-8c6c-43e6631ad951" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_9cd832eb-7391-4aef-879c-cdff4425dd12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_9cd832eb-7391-4aef-879c-cdff4425dd12" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_4a771493-1e2b-4e53-b1a8-4a59a99968ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_4a771493-1e2b-4e53-b1a8-4a59a99968ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_e06e759e-49fe-413d-b317-451036beba55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_e06e759e-49fe-413d-b317-451036beba55" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate_1150fac1-6d63-4933-87f1-3e4384a13067" xlink:href="aal-20251231.xsd#aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate_1150fac1-6d63-4933-87f1-3e4384a13067" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin_42c4583d-3ed7-4db1-8dec-8c9dab9faa8b" xlink:href="aal-20251231.xsd#aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin_42c4583d-3ed7-4db1-8dec-8c9dab9faa8b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentScheduledQuarterlyPrincipalAmortizationPercentageOfPrincipalOfLoansOutstanding_019baff0-3be5-7a07-b2a6-4b463fdba89e" xlink:href="aal-20251231.xsd#aal_DebtInstrumentScheduledQuarterlyPrincipalAmortizationPercentageOfPrincipalOfLoansOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_aal_DebtInstrumentScheduledQuarterlyPrincipalAmortizationPercentageOfPrincipalOfLoansOutstanding_019baff0-3be5-7a07-b2a6-4b463fdba89e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentQuarterlyPrincipalAmortization_019baff0-3be5-72e0-a850-2c47c5e48435" xlink:href="aal-20251231.xsd#aal_DebtInstrumentQuarterlyPrincipalAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_aal_DebtInstrumentQuarterlyPrincipalAmortization_019baff0-3be5-72e0-a850-2c47c5e48435" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentScheduledQuarterlyPrincipalAmortizationPercentageOfOriginalAggregatePrincipal_019baff3-821e-78b6-9592-7a34010867a2" xlink:href="aal-20251231.xsd#aal_DebtInstrumentScheduledQuarterlyPrincipalAmortizationPercentageOfOriginalAggregatePrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_aal_DebtInstrumentScheduledQuarterlyPrincipalAmortizationPercentageOfOriginalAggregatePrincipal_019baff3-821e-78b6-9592-7a34010867a2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPayment_80ad339e-b9ee-4805-978b-ae2dca1d3a40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentPeriodicPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPayment_80ad339e-b9ee-4805-978b-ae2dca1d3a40" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_4c88f29a-947f-41ac-b578-a6b598c2fb92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_4c88f29a-947f-41ac-b578-a6b598c2fb92" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentMandatoryPrepaymentAmountThresholdNetProceedsFromPrePaidFrequentFlyer_93c3e47c-c4a3-4a4d-9d47-11128437610a" xlink:href="aal-20251231.xsd#aal_DebtInstrumentMandatoryPrepaymentAmountThresholdNetProceedsFromPrePaidFrequentFlyer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d2319d86-0401-4adf-bf45-443eb65ed1e7" xlink:to="loc_aal_DebtInstrumentMandatoryPrepaymentAmountThresholdNetProceedsFromPrePaidFrequentFlyer_93c3e47c-c4a3-4a4d-9d47-11128437610a" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtEETCsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtEETCsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtEETCsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_4248fd9e-1a78-4575-ae4a-e0488e5ecf6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_2cea296d-33a4-4b26-aa7c-471d37cbbbf3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4248fd9e-1a78-4575-ae4a-e0488e5ecf6c" xlink:to="loc_us-gaap_DebtInstrumentTable_2cea296d-33a4-4b26-aa7c-471d37cbbbf3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_ac3be5dc-1ec1-45f8-a6a4-198f30488fc4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_2cea296d-33a4-4b26-aa7c-471d37cbbbf3" xlink:to="loc_dei_LegalEntityAxis_ac3be5dc-1ec1-45f8-a6a4-198f30488fc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ac3be5dc-1ec1-45f8-a6a4-198f30488fc4_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_ac3be5dc-1ec1-45f8-a6a4-198f30488fc4" xlink:to="loc_dei_EntityDomain_ac3be5dc-1ec1-45f8-a6a4-198f30488fc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_0da2b67f-b323-45b6-a02c-86ee13fd64c6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_ac3be5dc-1ec1-45f8-a6a4-198f30488fc4" xlink:to="loc_dei_EntityDomain_0da2b67f-b323-45b6-a02c-86ee13fd64c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_7eb73e91-e4ff-4cec-9078-d8c82b20c35a" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_0da2b67f-b323-45b6-a02c-86ee13fd64c6" xlink:to="loc_aal_AmericanAirlinesIncMember_7eb73e91-e4ff-4cec-9078-d8c82b20c35a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_7d217f3a-48ff-4961-833c-607f4b3dbee1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_2cea296d-33a4-4b26-aa7c-471d37cbbbf3" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_7d217f3a-48ff-4961-833c-607f4b3dbee1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_7d217f3a-48ff-4961-833c-607f4b3dbee1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_7d217f3a-48ff-4961-833c-607f4b3dbee1" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_7d217f3a-48ff-4961-833c-607f4b3dbee1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_88300a16-2f43-472b-a6cc-bfdcb011bf09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_7d217f3a-48ff-4961-833c-607f4b3dbee1" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_88300a16-2f43-472b-a6cc-bfdcb011bf09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnhancedEquipmentTrustCertificateMember_019c2ac1-35f9-7f8a-b22a-43333a36b806" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnhancedEquipmentTrustCertificateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_88300a16-2f43-472b-a6cc-bfdcb011bf09" xlink:to="loc_us-gaap_EnhancedEquipmentTrustCertificateMember_019c2ac1-35f9-7f8a-b22a-43333a36b806" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_a7aae330-0232-481b-a05c-fa4c434f03cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_2cea296d-33a4-4b26-aa7c-471d37cbbbf3" xlink:to="loc_us-gaap_DebtInstrumentAxis_a7aae330-0232-481b-a05c-fa4c434f03cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a7aae330-0232-481b-a05c-fa4c434f03cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_a7aae330-0232-481b-a05c-fa4c434f03cd" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a7aae330-0232-481b-a05c-fa4c434f03cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_712e92b9-15c9-41e8-ba52-dafbcdfb7af2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_a7aae330-0232-481b-a05c-fa4c434f03cd" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_712e92b9-15c9-41e8-ba52-dafbcdfb7af2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A20251AircraftEnhancedEquipmentTrustCertificateEETCsMember_019c2ac7-74d2-7593-a64c-356aa5a11b1f" xlink:href="aal-20251231.xsd#aal_A20251AircraftEnhancedEquipmentTrustCertificateEETCsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_712e92b9-15c9-41e8-ba52-dafbcdfb7af2" xlink:to="loc_aal_A20251AircraftEnhancedEquipmentTrustCertificateEETCsMember_019c2ac7-74d2-7593-a64c-356aa5a11b1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A20251AircraftEnhancedEquipmentTrustCertificateEETCsSeriesAMember_019c2ac7-45ee-743a-9bb4-b1d0169468ae" xlink:href="aal-20251231.xsd#aal_A20251AircraftEnhancedEquipmentTrustCertificateEETCsSeriesAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_A20251AircraftEnhancedEquipmentTrustCertificateEETCsMember_019c2ac7-74d2-7593-a64c-356aa5a11b1f" xlink:to="loc_aal_A20251AircraftEnhancedEquipmentTrustCertificateEETCsSeriesAMember_019c2ac7-45ee-743a-9bb4-b1d0169468ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A20251AircraftEnhancedEquipmentTrustCertificateEETCsSeriesBMember_019c2ac7-45ee-724d-b89b-1c96714ea405" xlink:href="aal-20251231.xsd#aal_A20251AircraftEnhancedEquipmentTrustCertificateEETCsSeriesBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_A20251AircraftEnhancedEquipmentTrustCertificateEETCsMember_019c2ac7-74d2-7593-a64c-356aa5a11b1f" xlink:to="loc_aal_A20251AircraftEnhancedEquipmentTrustCertificateEETCsSeriesBMember_019c2ac7-45ee-724d-b89b-1c96714ea405" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentNumberOfPassThroughTrusts_019bb389-8a3b-70bb-a23c-95e0818ff4de" xlink:href="aal-20251231.xsd#aal_DebtInstrumentNumberOfPassThroughTrusts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4248fd9e-1a78-4575-ae4a-e0488e5ecf6c" xlink:to="loc_aal_DebtInstrumentNumberOfPassThroughTrusts_019bb389-8a3b-70bb-a23c-95e0818ff4de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019bb38d-a236-7f1f-a917-a306141a2436" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4248fd9e-1a78-4575-ae4a-e0488e5ecf6c" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019bb38d-a236-7f1f-a917-a306141a2436" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentNumberOfAircraftDeliveredOrToBeDelivered_019c696f-e2e0-7e94-8ae3-a5e3bdf4b257" xlink:href="aal-20251231.xsd#aal_DebtInstrumentNumberOfAircraftDeliveredOrToBeDelivered"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4248fd9e-1a78-4575-ae4a-e0488e5ecf6c" xlink:to="loc_aal_DebtInstrumentNumberOfAircraftDeliveredOrToBeDelivered_019c696f-e2e0-7e94-8ae3-a5e3bdf4b257" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_019c6c86-9ea6-79f3-8f9a-5693f5fcd4a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4248fd9e-1a78-4575-ae4a-e0488e5ecf6c" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_019c6c86-9ea6-79f3-8f9a-5693f5fcd4a4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfAircraftOperated_019bb38e-b9d8-756c-ae6e-0775755cfb01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfAircraftOperated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4248fd9e-1a78-4575-ae4a-e0488e5ecf6c" xlink:to="loc_us-gaap_NumberOfAircraftOperated_019bb38e-b9d8-756c-ae6e-0775755cfb01" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_NoncashOrPartNoncashTransactionHeldInEscrow_019c456d-cc04-7ed7-8711-9e9e06963323" xlink:href="aal-20251231.xsd#aal_NoncashOrPartNoncashTransactionHeldInEscrow"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4248fd9e-1a78-4575-ae4a-e0488e5ecf6c" xlink:to="loc_aal_NoncashOrPartNoncashTransactionHeldInEscrow_019c456d-cc04-7ed7-8711-9e9e06963323" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019bb3a1-2c6d-744c-bb8d-4788e5942266" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4248fd9e-1a78-4575-ae4a-e0488e5ecf6c" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019bb3a1-2c6d-744c-bb8d-4788e5942266" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtEquipmentLoansandOtherNotesPayableDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtEquipmentLoansandOtherNotesPayableDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtEquipmentLoansandOtherNotesPayableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_b3237f93-0bd2-4bea-bb22-9cbe3ba23118" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_3ff94dec-7205-46b9-8191-3e564f009fd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_b3237f93-0bd2-4bea-bb22-9cbe3ba23118" xlink:to="loc_us-gaap_DebtInstrumentTable_3ff94dec-7205-46b9-8191-3e564f009fd0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_eefdaa87-2d3f-4a86-bea8-fefd25f67a42" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3ff94dec-7205-46b9-8191-3e564f009fd0" xlink:to="loc_dei_LegalEntityAxis_eefdaa87-2d3f-4a86-bea8-fefd25f67a42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_eefdaa87-2d3f-4a86-bea8-fefd25f67a42_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_eefdaa87-2d3f-4a86-bea8-fefd25f67a42" xlink:to="loc_dei_EntityDomain_eefdaa87-2d3f-4a86-bea8-fefd25f67a42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_7c810c06-e57c-4b6a-b5a4-15bae25e685e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_eefdaa87-2d3f-4a86-bea8-fefd25f67a42" xlink:to="loc_dei_EntityDomain_7c810c06-e57c-4b6a-b5a4-15bae25e685e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_4ed63032-05f8-4a5d-ba07-bc2d0178217e" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_7c810c06-e57c-4b6a-b5a4-15bae25e685e" xlink:to="loc_aal_AmericanAirlinesIncMember_4ed63032-05f8-4a5d-ba07-bc2d0178217e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_baf59261-fe69-4f3c-a80a-fd8d45a11e3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3ff94dec-7205-46b9-8191-3e564f009fd0" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_baf59261-fe69-4f3c-a80a-fd8d45a11e3a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_baf59261-fe69-4f3c-a80a-fd8d45a11e3a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_baf59261-fe69-4f3c-a80a-fd8d45a11e3a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_baf59261-fe69-4f3c-a80a-fd8d45a11e3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_c96fd954-1642-41e0-935f-eac1421cedc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_baf59261-fe69-4f3c-a80a-fd8d45a11e3a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_c96fd954-1642-41e0-935f-eac1421cedc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_5e64f469-18f9-43c0-8fad-5c9ecc66fb44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_c96fd954-1642-41e0-935f-eac1421cedc1" xlink:to="loc_us-gaap_SecuredDebtMember_5e64f469-18f9-43c0-8fad-5c9ecc66fb44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_9180e34c-a354-4bfb-8c81-bd4045a28104" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3ff94dec-7205-46b9-8191-3e564f009fd0" xlink:to="loc_us-gaap_DebtInstrumentAxis_9180e34c-a354-4bfb-8c81-bd4045a28104" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_9180e34c-a354-4bfb-8c81-bd4045a28104_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_9180e34c-a354-4bfb-8c81-bd4045a28104" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_9180e34c-a354-4bfb-8c81-bd4045a28104_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_340ab6ce-90af-44b6-8de4-1291e2ad70fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_9180e34c-a354-4bfb-8c81-bd4045a28104" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_340ab6ce-90af-44b6-8de4-1291e2ad70fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_EquipmentLoansAndOtherNotesPayableIssuedInCurrentYearMember_6783a1d1-b81b-4e1b-8d07-b90d7acc66aa" xlink:href="aal-20251231.xsd#aal_EquipmentLoansAndOtherNotesPayableIssuedInCurrentYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_340ab6ce-90af-44b6-8de4-1291e2ad70fe" xlink:to="loc_aal_EquipmentLoansAndOtherNotesPayableIssuedInCurrentYearMember_6783a1d1-b81b-4e1b-8d07-b90d7acc66aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSecuredNotesPayable_549fbc71-27ca-46cf-9282-7995716b7c22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSecuredNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_b3237f93-0bd2-4bea-bb22-9cbe3ba23118" xlink:to="loc_us-gaap_ProceedsFromSecuredNotesPayable_549fbc71-27ca-46cf-9282-7995716b7c22" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_40fd69a4-5e66-42b9-b566-7c1ae7fc054e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_b3237f93-0bd2-4bea-bb22-9cbe3ba23118" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_40fd69a4-5e66-42b9-b566-7c1ae7fc054e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtSpecialFacilityRevenueBondsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtSpecialFacilityRevenueBondsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtSpecialFacilityRevenueBondsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_65223075-883c-4683-bc17-443e4b856f54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_95139153-9966-4df5-ac8c-dd181e8b87a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65223075-883c-4683-bc17-443e4b856f54" xlink:to="loc_us-gaap_DebtInstrumentTable_95139153-9966-4df5-ac8c-dd181e8b87a9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_4e261325-4923-48c5-a44d-3fafc3995ed0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_95139153-9966-4df5-ac8c-dd181e8b87a9" xlink:to="loc_dei_LegalEntityAxis_4e261325-4923-48c5-a44d-3fafc3995ed0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_4e261325-4923-48c5-a44d-3fafc3995ed0_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_4e261325-4923-48c5-a44d-3fafc3995ed0" xlink:to="loc_dei_EntityDomain_4e261325-4923-48c5-a44d-3fafc3995ed0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_57acbf49-8008-4c85-b5ec-053454620fb5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_4e261325-4923-48c5-a44d-3fafc3995ed0" xlink:to="loc_dei_EntityDomain_57acbf49-8008-4c85-b5ec-053454620fb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_24122643-8c32-4c33-8075-6fde01f0b3e6" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_57acbf49-8008-4c85-b5ec-053454620fb5" xlink:to="loc_aal_AmericanAirlinesIncMember_24122643-8c32-4c33-8075-6fde01f0b3e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_c7497143-4875-4b47-8c52-be9075fda33b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_95139153-9966-4df5-ac8c-dd181e8b87a9" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_c7497143-4875-4b47-8c52-be9075fda33b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_c7497143-4875-4b47-8c52-be9075fda33b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_c7497143-4875-4b47-8c52-be9075fda33b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_c7497143-4875-4b47-8c52-be9075fda33b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9aeb8273-f872-4a9c-8b63-7a64fc927f67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_c7497143-4875-4b47-8c52-be9075fda33b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9aeb8273-f872-4a9c-8b63-7a64fc927f67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_aec514b8-0957-4635-917b-77b3a5310a76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_9aeb8273-f872-4a9c-8b63-7a64fc927f67" xlink:to="loc_us-gaap_SecuredDebtMember_aec514b8-0957-4635-917b-77b3a5310a76" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_63a06f85-e442-4cf5-93e3-ef26820bf6a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65223075-883c-4683-bc17-443e4b856f54" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_63a06f85-e442-4cf5-93e3-ef26820bf6a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_ee6ce6cd-e967-40b3-8bb9-15821182d73b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65223075-883c-4683-bc17-443e4b856f54" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_ee6ce6cd-e967-40b3-8bb9-15821182d73b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f3561027-16ff-4481-8816-0408fe55e0ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65223075-883c-4683-bc17-443e4b856f54" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f3561027-16ff-4481-8816-0408fe55e0ea" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtPSPPromissoryNotesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtPSPPromissoryNotesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtPSPPromissoryNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_5f7ae056-2056-4157-a96e-3c9b5cc26cf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_ea3f8114-5f93-493d-8e50-27d3dd0795f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5f7ae056-2056-4157-a96e-3c9b5cc26cf9" xlink:to="loc_us-gaap_DebtInstrumentTable_ea3f8114-5f93-493d-8e50-27d3dd0795f4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_7518d1c3-bab8-43d0-94d5-e77e71ce1a9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ea3f8114-5f93-493d-8e50-27d3dd0795f4" xlink:to="loc_us-gaap_DebtInstrumentAxis_7518d1c3-bab8-43d0-94d5-e77e71ce1a9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7518d1c3-bab8-43d0-94d5-e77e71ce1a9b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_7518d1c3-bab8-43d0-94d5-e77e71ce1a9b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7518d1c3-bab8-43d0-94d5-e77e71ce1a9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_9a0622b0-4d5d-47f4-8310-9fe9526f33ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_7518d1c3-bab8-43d0-94d5-e77e71ce1a9b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_9a0622b0-4d5d-47f4-8310-9fe9526f33ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PayrollSupportProgramPromissoryNoteCARESActMember_b240e59b-dc3e-422b-89ba-1af4fa6b98fa" xlink:href="aal-20251231.xsd#aal_PayrollSupportProgramPromissoryNoteCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_9a0622b0-4d5d-47f4-8310-9fe9526f33ea" xlink:to="loc_aal_PayrollSupportProgramPromissoryNoteCARESActMember_b240e59b-dc3e-422b-89ba-1af4fa6b98fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioAxis_b0d0672f-b642-4a2e-b753-bee3e88133a8" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ea3f8114-5f93-493d-8e50-27d3dd0795f4" xlink:to="loc_aal_InterestRateScenarioAxis_b0d0672f-b642-4a2e-b753-bee3e88133a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioDomain_b0d0672f-b642-4a2e-b753-bee3e88133a8_default" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_aal_InterestRateScenarioAxis_b0d0672f-b642-4a2e-b753-bee3e88133a8" xlink:to="loc_aal_InterestRateScenarioDomain_b0d0672f-b642-4a2e-b753-bee3e88133a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateScenarioDomain_b4ac4d00-89b0-4530-b0b1-4d0426c687c7" xlink:href="aal-20251231.xsd#aal_InterestRateScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_aal_InterestRateScenarioAxis_b0d0672f-b642-4a2e-b753-bee3e88133a8" xlink:to="loc_aal_InterestRateScenarioDomain_b4ac4d00-89b0-4530-b0b1-4d0426c687c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateFirstAndSecondQuartersOfCurrentYearMember_eeb5aba3-97b0-42e4-8e9b-b287a9be0d85" xlink:href="aal-20251231.xsd#aal_InterestRateFirstAndSecondQuartersOfCurrentYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_InterestRateScenarioDomain_b4ac4d00-89b0-4530-b0b1-4d0426c687c7" xlink:to="loc_aal_InterestRateFirstAndSecondQuartersOfCurrentYearMember_eeb5aba3-97b0-42e4-8e9b-b287a9be0d85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InterestRateThirdQuarterOfCurrentYearAndBeyondMember_f5b45617-3515-4787-987f-867966f72fe5" xlink:href="aal-20251231.xsd#aal_InterestRateThirdQuarterOfCurrentYearAndBeyondMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_InterestRateScenarioDomain_b4ac4d00-89b0-4530-b0b1-4d0426c687c7" xlink:to="loc_aal_InterestRateThirdQuarterOfCurrentYearAndBeyondMember_f5b45617-3515-4787-987f-867966f72fe5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_08da9ac1-cc66-4acb-b439-197e303098d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5f7ae056-2056-4157-a96e-3c9b5cc26cf9" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_08da9ac1-cc66-4acb-b439-197e303098d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_77394574-5527-48ea-9b9b-708026a00872" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5f7ae056-2056-4157-a96e-3c9b5cc26cf9" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_77394574-5527-48ea-9b9b-708026a00872" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_ff1490d7-e107-437e-842e-45b367befe40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5f7ae056-2056-4157-a96e-3c9b5cc26cf9" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_ff1490d7-e107-437e-842e-45b367befe40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentPrepaymentTriggerNumberOfDaysWithinTheOccurrenceOfTriggeringEvent_6e555995-ecf1-4ff0-a760-01c3bad32c9b" xlink:href="aal-20251231.xsd#aal_DebtInstrumentPrepaymentTriggerNumberOfDaysWithinTheOccurrenceOfTriggeringEvent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5f7ae056-2056-4157-a96e-3c9b5cc26cf9" xlink:to="loc_aal_DebtInstrumentPrepaymentTriggerNumberOfDaysWithinTheOccurrenceOfTriggeringEvent_6e555995-ecf1-4ff0-a760-01c3bad32c9b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/Debt650ConvertibleSeniorNotesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#Debt650ConvertibleSeniorNotesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/Debt650ConvertibleSeniorNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_9b0e4520-fbb5-437f-9656-145f09304710" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_75ae54ca-89e9-49d8-92c9-7d00c2faa2b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9b0e4520-fbb5-437f-9656-145f09304710" xlink:to="loc_us-gaap_DebtInstrumentTable_75ae54ca-89e9-49d8-92c9-7d00c2faa2b3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_477d206d-baf7-49e2-b1eb-507b67e9a007" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_75ae54ca-89e9-49d8-92c9-7d00c2faa2b3" xlink:to="loc_us-gaap_DebtInstrumentAxis_477d206d-baf7-49e2-b1eb-507b67e9a007" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_477d206d-baf7-49e2-b1eb-507b67e9a007_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_477d206d-baf7-49e2-b1eb-507b67e9a007" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_477d206d-baf7-49e2-b1eb-507b67e9a007_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e58dcc49-6e96-4518-9076-168af3ab8ffb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_477d206d-baf7-49e2-b1eb-507b67e9a007" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e58dcc49-6e96-4518-9076-168af3ab8ffb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ConvertibleSeniorNotes650Due2025Member_2d1cb6c5-e33b-4667-83ad-a2f43fe22feb" xlink:href="aal-20251231.xsd#aal_ConvertibleSeniorNotes650Due2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_e58dcc49-6e96-4518-9076-168af3ab8ffb" xlink:to="loc_aal_ConvertibleSeniorNotes650Due2025Member_2d1cb6c5-e33b-4667-83ad-a2f43fe22feb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_9b934939-aee0-4748-b89c-c125419ea402" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_75ae54ca-89e9-49d8-92c9-7d00c2faa2b3" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_9b934939-aee0-4748-b89c-c125419ea402" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9b934939-aee0-4748-b89c-c125419ea402_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9b934939-aee0-4748-b89c-c125419ea402" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9b934939-aee0-4748-b89c-c125419ea402_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_56b2360f-138a-44ff-b6e8-eecfda285873" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9b934939-aee0-4748-b89c-c125419ea402" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_56b2360f-138a-44ff-b6e8-eecfda285873" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_d9ef21c9-063d-447a-aaa8-627686a7b795" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_56b2360f-138a-44ff-b6e8-eecfda285873" xlink:to="loc_us-gaap_SeniorNotesMember_d9ef21c9-063d-447a-aaa8-627686a7b795" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c011821b-9975-4b0a-8a8a-6547bd749136" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9b0e4520-fbb5-437f-9656-145f09304710" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c011821b-9975-4b0a-8a8a-6547bd749136" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_998a9b8b-cb75-4b26-88c2-fca09db69bcf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9b0e4520-fbb5-437f-9656-145f09304710" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_998a9b8b-cb75-4b26-88c2-fca09db69bcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleStockPriceTrigger_019bb3a9-091b-7310-901e-66d66f340742" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentConvertibleStockPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9b0e4520-fbb5-437f-9656-145f09304710" xlink:to="loc_us-gaap_DebtInstrumentConvertibleStockPriceTrigger_019bb3a9-091b-7310-901e-66d66f340742" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_9f7b753d-4040-472d-b878-ebf6993dc104" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9b0e4520-fbb5-437f-9656-145f09304710" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_9f7b753d-4040-472d-b878-ebf6993dc104" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfConvertibleDebt_019bb3a9-091b-76aa-819f-fc2e5c65019d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9b0e4520-fbb5-437f-9656-145f09304710" xlink:to="loc_us-gaap_RepaymentsOfConvertibleDebt_019bb3a9-091b-76aa-819f-fc2e5c65019d" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtShortTermLoanFacilityDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtShortTermLoanFacilityDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtShortTermLoanFacilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3d3e65cf-0e01-4363-b888-6a6c62b2135c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_45d09ba9-f732-4ab1-9298-eeb6023c5393" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3d3e65cf-0e01-4363-b888-6a6c62b2135c" xlink:to="loc_us-gaap_DebtInstrumentTable_45d09ba9-f732-4ab1-9298-eeb6023c5393" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_b254301f-eafb-4d1e-838b-fa7fd0b23988" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_45d09ba9-f732-4ab1-9298-eeb6023c5393" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_b254301f-eafb-4d1e-838b-fa7fd0b23988" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b254301f-eafb-4d1e-838b-fa7fd0b23988_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b254301f-eafb-4d1e-838b-fa7fd0b23988" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b254301f-eafb-4d1e-838b-fa7fd0b23988_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_144a1099-5c6b-4772-b15c-e6b499528d8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b254301f-eafb-4d1e-838b-fa7fd0b23988" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_144a1099-5c6b-4772-b15c-e6b499528d8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019bb3b1-a0a6-704b-bf71-c94664e17503" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_144a1099-5c6b-4772-b15c-e6b499528d8b" xlink:to="loc_us-gaap_SecuredDebtMember_019bb3b1-a0a6-704b-bf71-c94664e17503" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_d11ed37f-5b00-4b82-ab0b-ddd3a8dc0ec1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_45d09ba9-f732-4ab1-9298-eeb6023c5393" xlink:to="loc_us-gaap_DebtInstrumentAxis_d11ed37f-5b00-4b82-ab0b-ddd3a8dc0ec1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d11ed37f-5b00-4b82-ab0b-ddd3a8dc0ec1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_d11ed37f-5b00-4b82-ab0b-ddd3a8dc0ec1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d11ed37f-5b00-4b82-ab0b-ddd3a8dc0ec1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b340eb2e-a277-473c-b7df-91851760ef7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_d11ed37f-5b00-4b82-ab0b-ddd3a8dc0ec1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b340eb2e-a277-473c-b7df-91851760ef7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SeniorUnsecuredShortTermLoanFacilityMember_019bb3b1-a0a6-75fe-b615-2e53ce9f3a6f" xlink:href="aal-20251231.xsd#aal_SeniorUnsecuredShortTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b340eb2e-a277-473c-b7df-91851760ef7c" xlink:to="loc_aal_SeniorUnsecuredShortTermLoanFacilityMember_019bb3b1-a0a6-75fe-b615-2e53ce9f3a6f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A1075SeniorSecuredNotesMember_019bb3b1-a0a6-7772-b1f4-cf897b1c1df5" xlink:href="aal-20251231.xsd#aal_A1075SeniorSecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b340eb2e-a277-473c-b7df-91851760ef7c" xlink:to="loc_aal_A1075SeniorSecuredNotesMember_019bb3b1-a0a6-7772-b1f4-cf897b1c1df5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_019bb3b1-a0a6-7767-b2a7-518447478b8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_45d09ba9-f732-4ab1-9298-eeb6023c5393" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_019bb3b1-a0a6-7767-b2a7-518447478b8b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019bb3b1-a0a6-7767-b2a7-518447478b8b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_019bb3b1-a0a6-7767-b2a7-518447478b8b" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019bb3b1-a0a6-7767-b2a7-518447478b8b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019bb3b1-a0a6-7c52-86a4-5c1a7cfa00ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_019bb3b1-a0a6-7767-b2a7-518447478b8b" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019bb3b1-a0a6-7c52-86a4-5c1a7cfa00ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_019bb3b1-a0a6-756f-9627-94f743a178fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_019bb3b1-a0a6-7c52-86a4-5c1a7cfa00ef" xlink:to="loc_us-gaap_UnsecuredDebtMember_019bb3b1-a0a6-756f-9627-94f743a178fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019bb3b1-a0a6-7a0e-a43d-af264bec6d64" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_45d09ba9-f732-4ab1-9298-eeb6023c5393" xlink:to="loc_dei_LegalEntityAxis_019bb3b1-a0a6-7a0e-a43d-af264bec6d64" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019bb3b1-a0a6-7a0e-a43d-af264bec6d64_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019bb3b1-a0a6-7a0e-a43d-af264bec6d64" xlink:to="loc_dei_EntityDomain_019bb3b1-a0a6-7a0e-a43d-af264bec6d64_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019bb3b1-a0a6-7a1d-8b7e-d657715815ce" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019bb3b1-a0a6-7a0e-a43d-af264bec6d64" xlink:to="loc_dei_EntityDomain_019bb3b1-a0a6-7a1d-8b7e-d657715815ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_019bb3b1-a0a6-7f05-b094-995ed06a333f" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019bb3b1-a0a6-7a1d-8b7e-d657715815ce" xlink:to="loc_aal_AmericanAirlinesIncMember_019bb3b1-a0a6-7f05-b094-995ed06a333f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromShortTermDebt_019bb3b1-a0a6-7512-a2bb-a7a0c144da43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromShortTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3d3e65cf-0e01-4363-b888-6a6c62b2135c" xlink:to="loc_us-gaap_ProceedsFromShortTermDebt_019bb3b1-a0a6-7512-a2bb-a7a0c144da43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LongTermDebtRefinancedAmount_019bb3b1-a0a6-7245-9ecc-31e75b406252" xlink:href="aal-20251231.xsd#aal_LongTermDebtRefinancedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3d3e65cf-0e01-4363-b888-6a6c62b2135c" xlink:to="loc_aal_LongTermDebtRefinancedAmount_019bb3b1-a0a6-7245-9ecc-31e75b406252" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f99b0c09-373d-412f-bbe0-02a902d17860" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3d3e65cf-0e01-4363-b888-6a6c62b2135c" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f99b0c09-373d-412f-bbe0-02a902d17860" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019bb3b1-a0a6-75c8-a2e0-54b13a4eb06e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3d3e65cf-0e01-4363-b888-6a6c62b2135c" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019bb3b1-a0a6-75c8-a2e0-54b13a4eb06e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtOtherFinancingActivitiesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtOtherFinancingActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtOtherFinancingActivitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c2a77-a825-79b0-8701-43df9dd8ee34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c2a77-a825-7fcc-9e22-1a1613dc5796" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c2a77-a825-79b0-8701-43df9dd8ee34" xlink:to="loc_us-gaap_DebtInstrumentTable_019c2a77-a825-7fcc-9e22-1a1613dc5796" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c2a77-a825-7828-a72b-d526f0abcd29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c2a77-a825-7fcc-9e22-1a1613dc5796" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c2a77-a825-7828-a72b-d526f0abcd29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c2a77-a825-7828-a72b-d526f0abcd29_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c2a77-a825-7828-a72b-d526f0abcd29" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c2a77-a825-7828-a72b-d526f0abcd29_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c2a77-a825-70a7-af6d-7d45882e11e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c2a77-a825-7828-a72b-d526f0abcd29" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c2a77-a825-70a7-af6d-7d45882e11e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnhancedEquipmentTrustCertificateMember_019c2a77-a825-73b3-9d32-05dd3dc7d366" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnhancedEquipmentTrustCertificateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c2a77-a825-70a7-af6d-7d45882e11e1" xlink:to="loc_us-gaap_EnhancedEquipmentTrustCertificateMember_019c2a77-a825-73b3-9d32-05dd3dc7d366" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c2a77-a825-7725-9083-b2f2363e6f31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c2a77-a825-7fcc-9e22-1a1613dc5796" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c2a77-a825-7725-9083-b2f2363e6f31" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c2a77-a825-7725-9083-b2f2363e6f31_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c2a77-a825-7725-9083-b2f2363e6f31" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c2a77-a825-7725-9083-b2f2363e6f31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c2a77-a825-7b48-abc6-cb0d7ab2fb8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c2a77-a825-7725-9083-b2f2363e6f31" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c2a77-a825-7b48-abc6-cb0d7ab2fb8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019c2a77-a825-7bf1-b653-9d7235e2d9a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c2a77-a825-7b48-abc6-cb0d7ab2fb8e" xlink:to="loc_us-gaap_SecuredDebtMember_019c2a77-a825-7bf1-b653-9d7235e2d9a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c2a77-a825-7c45-b648-01b5eee9271f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c2a77-a825-7fcc-9e22-1a1613dc5796" xlink:to="loc_dei_LegalEntityAxis_019c2a77-a825-7c45-b648-01b5eee9271f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c2a77-a825-7c45-b648-01b5eee9271f_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c2a77-a825-7c45-b648-01b5eee9271f" xlink:to="loc_dei_EntityDomain_019c2a77-a825-7c45-b648-01b5eee9271f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c2a77-a825-70a3-b13f-fe865c084550" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c2a77-a825-7c45-b648-01b5eee9271f" xlink:to="loc_dei_EntityDomain_019c2a77-a825-70a3-b13f-fe865c084550" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_019c2a77-a825-7ae3-953e-f9500756a07a" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c2a77-a825-70a3-b13f-fe865c084550" xlink:to="loc_aal_AmericanAirlinesIncMember_019c2a77-a825-7ae3-953e-f9500756a07a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_019c2a77-a825-7d01-a63b-0fccbdc1de13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c2a77-a825-79b0-8701-43df9dd8ee34" xlink:to="loc_us-gaap_RepaymentsOfDebt_019c2a77-a825-7d01-a63b-0fccbdc1de13" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/DebtCertainCovenantsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#DebtCertainCovenantsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/DebtCertainCovenantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_0e551370-2e8b-47d3-a26a-157275a2cb46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_49f0e47b-b93b-40a8-a4ca-5413112abea6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0e551370-2e8b-47d3-a26a-157275a2cb46" xlink:to="loc_us-gaap_DebtInstrumentTable_49f0e47b-b93b-40a8-a4ca-5413112abea6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_0557b953-01d0-45db-a69b-c37caa867dc2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_49f0e47b-b93b-40a8-a4ca-5413112abea6" xlink:to="loc_dei_LegalEntityAxis_0557b953-01d0-45db-a69b-c37caa867dc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_0557b953-01d0-45db-a69b-c37caa867dc2_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_0557b953-01d0-45db-a69b-c37caa867dc2" xlink:to="loc_dei_EntityDomain_0557b953-01d0-45db-a69b-c37caa867dc2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_476507ae-1b82-4bcf-9991-1657fdb942a8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_0557b953-01d0-45db-a69b-c37caa867dc2" xlink:to="loc_dei_EntityDomain_476507ae-1b82-4bcf-9991-1657fdb942a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_18f446f6-2a63-4579-9e21-8861dbbbe9b2" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_476507ae-1b82-4bcf-9991-1657fdb942a8" xlink:to="loc_aal_AmericanAirlinesIncMember_18f446f6-2a63-4579-9e21-8861dbbbe9b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_17b789e9-1789-4a06-b787-edce1ce67d30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_49f0e47b-b93b-40a8-a4ca-5413112abea6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_17b789e9-1789-4a06-b787-edce1ce67d30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_17b789e9-1789-4a06-b787-edce1ce67d30_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_17b789e9-1789-4a06-b787-edce1ce67d30" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_17b789e9-1789-4a06-b787-edce1ce67d30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_151f4d19-34ce-464a-938a-2c4b11d7bcdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_17b789e9-1789-4a06-b787-edce1ce67d30" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_151f4d19-34ce-464a-938a-2c4b11d7bcdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_87f8e22c-98ee-48f4-8704-fd75f32012f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_151f4d19-34ce-464a-938a-2c4b11d7bcdd" xlink:to="loc_us-gaap_SecuredDebtMember_87f8e22c-98ee-48f4-8704-fd75f32012f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_3a1f88c0-329b-4d0a-aeae-5386b6a177e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_49f0e47b-b93b-40a8-a4ca-5413112abea6" xlink:to="loc_us-gaap_DebtInstrumentAxis_3a1f88c0-329b-4d0a-aeae-5386b6a177e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3a1f88c0-329b-4d0a-aeae-5386b6a177e9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_3a1f88c0-329b-4d0a-aeae-5386b6a177e9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3a1f88c0-329b-4d0a-aeae-5386b6a177e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_49f680b4-e2fe-4129-89bd-d5dbe585eb10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_3a1f88c0-329b-4d0a-aeae-5386b6a177e9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_49f680b4-e2fe-4129-89bd-d5dbe585eb10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A2013CreditFacilityAnd7.25SeniorSecuredNotesMember_b10cb1f4-194e-4311-bf64-04148fa5bbe8" xlink:href="aal-20251231.xsd#aal_A2013CreditFacilityAnd7.25SeniorSecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_49f680b4-e2fe-4129-89bd-d5dbe585eb10" xlink:to="loc_aal_A2013CreditFacilityAnd7.25SeniorSecuredNotesMember_b10cb1f4-194e-4311-bf64-04148fa5bbe8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A725SeniorSecuredNotesDue2028Member_9a93340e-61a0-4876-9ac3-cca245e6057d" xlink:href="aal-20251231.xsd#aal_A725SeniorSecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_A2013CreditFacilityAnd7.25SeniorSecuredNotesMember_b10cb1f4-194e-4311-bf64-04148fa5bbe8" xlink:to="loc_aal_A725SeniorSecuredNotesDue2028Member_9a93340e-61a0-4876-9ac3-cca245e6057d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CreditFacility2014Member_7c939369-a622-44a3-b13e-61c98d2697bb" xlink:href="aal-20251231.xsd#aal_CreditFacility2014Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_49f680b4-e2fe-4129-89bd-d5dbe585eb10" xlink:to="loc_aal_CreditFacility2014Member_7c939369-a622-44a3-b13e-61c98d2697bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A2023TermLoanFacilityAnd8.50SeniorSecuredNotesMember_0a35ddad-44a6-4c95-b84f-2001880652cf" xlink:href="aal-20251231.xsd#aal_A2023TermLoanFacilityAnd8.50SeniorSecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_49f680b4-e2fe-4129-89bd-d5dbe585eb10" xlink:to="loc_aal_A2023TermLoanFacilityAnd8.50SeniorSecuredNotesMember_0a35ddad-44a6-4c95-b84f-2001880652cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A850SeniorSecuredNotesDue2029Member_2cd6a5f1-4c52-4e74-ae29-761580d08c3b" xlink:href="aal-20251231.xsd#aal_A850SeniorSecuredNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_A2023TermLoanFacilityAnd8.50SeniorSecuredNotesMember_0a35ddad-44a6-4c95-b84f-2001880652cf" xlink:to="loc_aal_A850SeniorSecuredNotesDue2029Member_2cd6a5f1-4c52-4e74-ae29-761580d08c3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LineOfCreditFacilityCovenantTermsMinimumAggregateLiquidityRequired_019bb46d-7eba-7016-adf4-ed42c1db3eab" xlink:href="aal-20251231.xsd#aal_LineOfCreditFacilityCovenantTermsMinimumAggregateLiquidityRequired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0e551370-2e8b-47d3-a26a-157275a2cb46" xlink:to="loc_aal_LineOfCreditFacilityCovenantTermsMinimumAggregateLiquidityRequired_019bb46d-7eba-7016-adf4-ed42c1db3eab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_3e99c10b-33e9-4351-8532-d750f598e89c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0e551370-2e8b-47d3-a26a-157275a2cb46" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_3e99c10b-33e9-4351-8532-d750f598e89c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentCollateralCovenantLoanToValueRatioMultiplier_47a5fa98-da78-4860-85d0-649fb1c3eb24" xlink:href="aal-20251231.xsd#aal_DebtInstrumentCollateralCovenantLoanToValueRatioMultiplier"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0e551370-2e8b-47d3-a26a-157275a2cb46" xlink:to="loc_aal_DebtInstrumentCollateralCovenantLoanToValueRatioMultiplier_47a5fa98-da78-4860-85d0-649fb1c3eb24" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentCollateralCovenantMaximumLoanToValueRatio_cdd67939-4527-4101-a203-29ad99dc3793" xlink:href="aal-20251231.xsd#aal_DebtInstrumentCollateralCovenantMaximumLoanToValueRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0e551370-2e8b-47d3-a26a-157275a2cb46" xlink:to="loc_aal_DebtInstrumentCollateralCovenantMaximumLoanToValueRatio_cdd67939-4527-4101-a203-29ad99dc3793" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LtvAsOfMeasurementDate_370d197d-782a-485c-8832-2cebe3944bf4" xlink:href="aal-20251231.xsd#aal_LtvAsOfMeasurementDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0e551370-2e8b-47d3-a26a-157275a2cb46" xlink:to="loc_aal_LtvAsOfMeasurementDate_370d197d-782a-485c-8832-2cebe3944bf4" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/LeasesAdditionalInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#LeasesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/LeasesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_722e86d6-d978-4777-8f01-94f4f810b085" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_338ba8a7-7db9-4822-aafb-df4478fd320a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_722e86d6-d978-4777-8f01-94f4f810b085" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_338ba8a7-7db9-4822-aafb-df4478fd320a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_f3c66073-9783-45a5-bd17-95ff4daa6113" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_338ba8a7-7db9-4822-aafb-df4478fd320a" xlink:to="loc_srt_RangeAxis_f3c66073-9783-45a5-bd17-95ff4daa6113" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f3c66073-9783-45a5-bd17-95ff4daa6113_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_f3c66073-9783-45a5-bd17-95ff4daa6113" xlink:to="loc_srt_RangeMember_f3c66073-9783-45a5-bd17-95ff4daa6113_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e3a1ad8d-be5d-43c4-ac28-ab792498026a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_f3c66073-9783-45a5-bd17-95ff4daa6113" xlink:to="loc_srt_RangeMember_e3a1ad8d-be5d-43c4-ac28-ab792498026a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_712e6e86-2399-4b5a-8e65-65dae543c61a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e3a1ad8d-be5d-43c4-ac28-ab792498026a" xlink:to="loc_srt_MinimumMember_712e6e86-2399-4b5a-8e65-65dae543c61a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_ce1b3cfe-f3e6-4471-9679-853a0a527381" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e3a1ad8d-be5d-43c4-ac28-ab792498026a" xlink:to="loc_srt_MaximumMember_ce1b3cfe-f3e6-4471-9679-853a0a527381" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_5d7f8bec-01bb-45ba-aff9-5ef59638495c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_338ba8a7-7db9-4822-aafb-df4478fd320a" xlink:to="loc_dei_LegalEntityAxis_5d7f8bec-01bb-45ba-aff9-5ef59638495c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_5d7f8bec-01bb-45ba-aff9-5ef59638495c_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_5d7f8bec-01bb-45ba-aff9-5ef59638495c" xlink:to="loc_dei_EntityDomain_5d7f8bec-01bb-45ba-aff9-5ef59638495c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_38361df1-131c-431e-bf53-f6147684af5b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_5d7f8bec-01bb-45ba-aff9-5ef59638495c" xlink:to="loc_dei_EntityDomain_38361df1-131c-431e-bf53-f6147684af5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_a80863f7-a07d-4863-aa29-fc6bf7891a31" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_38361df1-131c-431e-bf53-f6147684af5b" xlink:to="loc_aal_AmericanAirlinesIncMember_a80863f7-a07d-4863-aa29-fc6bf7891a31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_378948f0-2823-4c3f-881d-7d437a354edc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_338ba8a7-7db9-4822-aafb-df4478fd320a" xlink:to="loc_srt_CounterpartyNameAxis_378948f0-2823-4c3f-881d-7d437a354edc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_378948f0-2823-4c3f-881d-7d437a354edc_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_378948f0-2823-4c3f-881d-7d437a354edc" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_378948f0-2823-4c3f-881d-7d437a354edc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_9dd9f295-89b4-4bd9-b6e0-b5ea6b8965fc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_378948f0-2823-4c3f-881d-7d437a354edc" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_9dd9f295-89b4-4bd9-b6e0-b5ea6b8965fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RepublicAirlineIncMember_e9c6f5e4-da23-48ae-82ce-f98a3d335da6" xlink:href="aal-20251231.xsd#aal_RepublicAirlineIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_9dd9f295-89b4-4bd9-b6e0-b5ea6b8965fc" xlink:to="loc_aal_RepublicAirlineIncMember_e9c6f5e4-da23-48ae-82ce-f98a3d335da6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_619e73e0-9081-4b2b-9a71-2b06e690ca47" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_338ba8a7-7db9-4822-aafb-df4478fd320a" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_619e73e0-9081-4b2b-9a71-2b06e690ca47" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_619e73e0-9081-4b2b-9a71-2b06e690ca47_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_619e73e0-9081-4b2b-9a71-2b06e690ca47" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_619e73e0-9081-4b2b-9a71-2b06e690ca47_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_2f9a2fe5-cb3a-459e-8fee-1e5722e75f55" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_619e73e0-9081-4b2b-9a71-2b06e690ca47" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_2f9a2fe5-cb3a-459e-8fee-1e5722e75f55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RepublicAirwaysHoldingsInc.Member_bf74ac26-a008-4238-a90c-552ce722005e" xlink:href="aal-20251231.xsd#aal_RepublicAirwaysHoldingsInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_2f9a2fe5-cb3a-459e-8fee-1e5722e75f55" xlink:to="loc_aal_RepublicAirwaysHoldingsInc.Member_bf74ac26-a008-4238-a90c-552ce722005e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AircraftTypeAxis_a1a0e6b6-9778-420c-9724-bbba7051cc15" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AircraftTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_338ba8a7-7db9-4822-aafb-df4478fd320a" xlink:to="loc_srt_AircraftTypeAxis_a1a0e6b6-9778-420c-9724-bbba7051cc15" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AircraftTypeMember_a1a0e6b6-9778-420c-9724-bbba7051cc15_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AircraftTypeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_AircraftTypeAxis_a1a0e6b6-9778-420c-9724-bbba7051cc15" xlink:to="loc_srt_AircraftTypeMember_a1a0e6b6-9778-420c-9724-bbba7051cc15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AircraftTypeMember_b25be8c2-3982-4e10-a700-da5b7df521ed" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AircraftTypeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_AircraftTypeAxis_a1a0e6b6-9778-420c-9724-bbba7051cc15" xlink:to="loc_srt_AircraftTypeMember_b25be8c2-3982-4e10-a700-da5b7df521ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LeasedAircraftMember_7587dfae-c10f-4809-a55a-c2fbe10bace3" xlink:href="aal-20251231.xsd#aal_LeasedAircraftMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_AircraftTypeMember_b25be8c2-3982-4e10-a700-da5b7df521ed" xlink:to="loc_aal_LeasedAircraftMember_7587dfae-c10f-4809-a55a-c2fbe10bace3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AircraftLeasedUnderCapacityPurchaseAgreementsMember_869aa973-a1bf-42b4-89a1-dd786df730c6" xlink:href="aal-20251231.xsd#aal_AircraftLeasedUnderCapacityPurchaseAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_AircraftTypeMember_b25be8c2-3982-4e10-a700-da5b7df521ed" xlink:to="loc_aal_AircraftLeasedUnderCapacityPurchaseAgreementsMember_869aa973-a1bf-42b4-89a1-dd786df730c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfAircraftOperated_67086967-e89c-4945-ad7a-df37783fd121" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfAircraftOperated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_722e86d6-d978-4777-8f01-94f4f810b085" xlink:to="loc_us-gaap_NumberOfAircraftOperated_67086967-e89c-4945-ad7a-df37783fd121" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LesseeOperatingAndFinanceLeaseTermOfContract_531c3afc-4ef1-4ffd-9ace-da17b2d9706a" xlink:href="aal-20251231.xsd#aal_LesseeOperatingAndFinanceLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_722e86d6-d978-4777-8f01-94f4f810b085" xlink:to="loc_aal_LesseeOperatingAndFinanceLeaseTermOfContract_531c3afc-4ef1-4ffd-9ace-da17b2d9706a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_019c4d5f-2d52-7312-b990-584ea8dee7cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_722e86d6-d978-4777-8f01-94f4f810b085" xlink:to="loc_us-gaap_LeaseCost_019c4d5f-2d52-7312-b990-584ea8dee7cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_23c57b53-d937-45d1-8bdc-c58f5dc85c23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_722e86d6-d978-4777-8f01-94f4f810b085" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_23c57b53-d937-45d1-8bdc-c58f5dc85c23" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/LeasesComponentsofLeaseExpenseDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#LeasesComponentsofLeaseExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/LeasesComponentsofLeaseExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_e9cc36e8-9e03-453c-9cc7-6f10ddde21f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_e47ee511-246a-4a47-9dc5-6bb5c30da554" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e9cc36e8-9e03-453c-9cc7-6f10ddde21f8" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_e47ee511-246a-4a47-9dc5-6bb5c30da554" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_c8b11127-ba79-484e-af5c-ccc984ef8504" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_e47ee511-246a-4a47-9dc5-6bb5c30da554" xlink:to="loc_dei_LegalEntityAxis_c8b11127-ba79-484e-af5c-ccc984ef8504" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_c8b11127-ba79-484e-af5c-ccc984ef8504_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_c8b11127-ba79-484e-af5c-ccc984ef8504" xlink:to="loc_dei_EntityDomain_c8b11127-ba79-484e-af5c-ccc984ef8504_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_15f32704-f2d4-46c1-977c-c0d5934dceac" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_c8b11127-ba79-484e-af5c-ccc984ef8504" xlink:to="loc_dei_EntityDomain_15f32704-f2d4-46c1-977c-c0d5934dceac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_6a7dd832-4ccd-41af-b2c6-e51398345e4b" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_15f32704-f2d4-46c1-977c-c0d5934dceac" xlink:to="loc_aal_AmericanAirlinesIncMember_6a7dd832-4ccd-41af-b2c6-e51398345e4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_8be66453-0cc9-4f5f-8c98-7a36f9fac1ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e9cc36e8-9e03-453c-9cc7-6f10ddde21f8" xlink:to="loc_us-gaap_OperatingLeaseCost_8be66453-0cc9-4f5f-8c98-7a36f9fac1ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FinanceLeaseCost1Abstract_77cab0a6-216d-4dbc-a16c-253c1da920f3" xlink:href="aal-20251231.xsd#aal_FinanceLeaseCost1Abstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e9cc36e8-9e03-453c-9cc7-6f10ddde21f8" xlink:to="loc_aal_FinanceLeaseCost1Abstract_77cab0a6-216d-4dbc-a16c-253c1da920f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_f38e4ae5-d414-4205-994a-b17f75a5743e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseRightOfUseAssetAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_FinanceLeaseCost1Abstract_77cab0a6-216d-4dbc-a16c-253c1da920f3" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_f38e4ae5-d414-4205-994a-b17f75a5743e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_10e3f1c6-a280-4350-8a7f-457cfcf88eb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_FinanceLeaseCost1Abstract_77cab0a6-216d-4dbc-a16c-253c1da920f3" xlink:to="loc_us-gaap_FinanceLeaseInterestExpense_10e3f1c6-a280-4350-8a7f-457cfcf88eb8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_876af75d-cb39-402a-b2bd-55271e2dc85d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e9cc36e8-9e03-453c-9cc7-6f10ddde21f8" xlink:to="loc_us-gaap_VariableLeaseCost_876af75d-cb39-402a-b2bd-55271e2dc85d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_3f0df30a-6a04-4ca0-b360-2ba4f871696d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e9cc36e8-9e03-453c-9cc7-6f10ddde21f8" xlink:to="loc_us-gaap_LeaseCost_3f0df30a-6a04-4ca0-b360-2ba4f871696d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/LeasesSupplementalBalanceSheetInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#LeasesSupplementalBalanceSheetInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/LeasesSupplementalBalanceSheetInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_cde984af-7d7b-40a1-8aef-8455b58f895b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_b8aa1c1c-4592-47d2-b854-29c1107c7294" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_cde984af-7d7b-40a1-8aef-8455b58f895b" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_b8aa1c1c-4592-47d2-b854-29c1107c7294" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_b5c9f728-45ba-4a44-8581-bd0e413b64dd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_b8aa1c1c-4592-47d2-b854-29c1107c7294" xlink:to="loc_dei_LegalEntityAxis_b5c9f728-45ba-4a44-8581-bd0e413b64dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b5c9f728-45ba-4a44-8581-bd0e413b64dd_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_b5c9f728-45ba-4a44-8581-bd0e413b64dd" xlink:to="loc_dei_EntityDomain_b5c9f728-45ba-4a44-8581-bd0e413b64dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_931e01a9-d489-424b-b07a-77551b8fac39" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_b5c9f728-45ba-4a44-8581-bd0e413b64dd" xlink:to="loc_dei_EntityDomain_931e01a9-d489-424b-b07a-77551b8fac39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_9c5becb5-0973-4efe-8f73-9ad4ac55a104" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_931e01a9-d489-424b-b07a-77551b8fac39" xlink:to="loc_aal_AmericanAirlinesIncMember_9c5becb5-0973-4efe-8f73-9ad4ac55a104" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_924ce5be-5bc7-4ff6-8bcf-c160f4b61887" xlink:href="aal-20251231.xsd#aal_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_cde984af-7d7b-40a1-8aef-8455b58f895b" xlink:to="loc_aal_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_924ce5be-5bc7-4ff6-8bcf-c160f4b61887" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_4303caf6-8fd6-4020-aa59-58245686d4d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_924ce5be-5bc7-4ff6-8bcf-c160f4b61887" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_4303caf6-8fd6-4020-aa59-58245686d4d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_8e11552f-c663-4940-975a-751bbcd0fc89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_924ce5be-5bc7-4ff6-8bcf-c160f4b61887" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_8e11552f-c663-4940-975a-751bbcd0fc89" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_868f6b0c-5678-4040-b8f3-98dd2b7d757e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_924ce5be-5bc7-4ff6-8bcf-c160f4b61887" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_868f6b0c-5678-4040-b8f3-98dd2b7d757e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_a847cd6f-0fb4-4b2c-a883-c8ecb6213404" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_924ce5be-5bc7-4ff6-8bcf-c160f4b61887" xlink:to="loc_us-gaap_OperatingLeaseLiability_a847cd6f-0fb4-4b2c-a883-c8ecb6213404" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_a132cf16-c26f-4195-881e-dc80f4ef37d4" xlink:href="aal-20251231.xsd#aal_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_cde984af-7d7b-40a1-8aef-8455b58f895b" xlink:to="loc_aal_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_a132cf16-c26f-4195-881e-dc80f4ef37d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_2de581c2-2915-4564-ae1c-7cc72b7c9c38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_a132cf16-c26f-4195-881e-dc80f4ef37d4" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_2de581c2-2915-4564-ae1c-7cc72b7c9c38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization_24edba07-397d-48d6-973a-9294e292f975" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_a132cf16-c26f-4195-881e-dc80f4ef37d4" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization_24edba07-397d-48d6-973a-9294e292f975" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_5f276a61-2586-44db-aec6-fa631e5c4a17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_a132cf16-c26f-4195-881e-dc80f4ef37d4" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_5f276a61-2586-44db-aec6-fa631e5c4a17" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_e620fe33-68a9-4b82-85bb-2bad307d1ee1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_a132cf16-c26f-4195-881e-dc80f4ef37d4" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_e620fe33-68a9-4b82-85bb-2bad307d1ee1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_82e185f2-8bc6-4f98-b442-d3d41da38377" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_a132cf16-c26f-4195-881e-dc80f4ef37d4" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_82e185f2-8bc6-4f98-b442-d3d41da38377" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_a61e07c9-3aa6-4a22-aa44-0712b896f139" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_a132cf16-c26f-4195-881e-dc80f4ef37d4" xlink:to="loc_us-gaap_FinanceLeaseLiability_a61e07c9-3aa6-4a22-aa44-0712b896f139" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_WeightedAverageRemainingLeaseTermAbstract_778c252c-6aa2-457e-8196-e3981723fe63" xlink:href="aal-20251231.xsd#aal_WeightedAverageRemainingLeaseTermAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_cde984af-7d7b-40a1-8aef-8455b58f895b" xlink:to="loc_aal_WeightedAverageRemainingLeaseTermAbstract_778c252c-6aa2-457e-8196-e3981723fe63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_60a82cfe-01c8-4939-8929-547edbb8cc21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_WeightedAverageRemainingLeaseTermAbstract_778c252c-6aa2-457e-8196-e3981723fe63" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_60a82cfe-01c8-4939-8929-547edbb8cc21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_e56f387d-0543-4418-b3c9-eac8c5ffa8d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_WeightedAverageRemainingLeaseTermAbstract_778c252c-6aa2-457e-8196-e3981723fe63" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_e56f387d-0543-4418-b3c9-eac8c5ffa8d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LeasesWeightedAverageDiscountRateAbstract_218d2c3c-09f3-44af-afb7-038824b565e2" xlink:href="aal-20251231.xsd#aal_LeasesWeightedAverageDiscountRateAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_cde984af-7d7b-40a1-8aef-8455b58f895b" xlink:to="loc_aal_LeasesWeightedAverageDiscountRateAbstract_218d2c3c-09f3-44af-afb7-038824b565e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_1a78bc6c-1275-4c4c-ae2a-d52147b921d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_LeasesWeightedAverageDiscountRateAbstract_218d2c3c-09f3-44af-afb7-038824b565e2" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_1a78bc6c-1275-4c4c-ae2a-d52147b921d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_301c709a-d7d5-4448-b068-15128019c573" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_LeasesWeightedAverageDiscountRateAbstract_218d2c3c-09f3-44af-afb7-038824b565e2" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_301c709a-d7d5-4448-b068-15128019c573" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_5240e536-0f6b-4135-ba30-58c2dc3ff59e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_cde984af-7d7b-40a1-8aef-8455b58f895b" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_5240e536-0f6b-4135-ba30-58c2dc3ff59e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_1d9d7bd9-0df9-41bf-a92b-8feedff5253d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_cde984af-7d7b-40a1-8aef-8455b58f895b" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_1d9d7bd9-0df9-41bf-a92b-8feedff5253d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_74cc27ed-db89-4f4e-b857-9ec97f3f6e66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_cde984af-7d7b-40a1-8aef-8455b58f895b" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_74cc27ed-db89-4f4e-b857-9ec97f3f6e66" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/LeasesSupplementalCashFlowandOtherInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#LeasesSupplementalCashFlowandOtherInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/LeasesSupplementalCashFlowandOtherInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_f63c8dd1-785a-4ea1-9045-754859b8a6b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_35886ede-f79a-452a-b6e0-7a936b4d1aa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f63c8dd1-785a-4ea1-9045-754859b8a6b1" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_35886ede-f79a-452a-b6e0-7a936b4d1aa5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_7eb0b418-80f1-4e10-b59a-e62a2b5e82eb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_35886ede-f79a-452a-b6e0-7a936b4d1aa5" xlink:to="loc_dei_LegalEntityAxis_7eb0b418-80f1-4e10-b59a-e62a2b5e82eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_7eb0b418-80f1-4e10-b59a-e62a2b5e82eb_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_7eb0b418-80f1-4e10-b59a-e62a2b5e82eb" xlink:to="loc_dei_EntityDomain_7eb0b418-80f1-4e10-b59a-e62a2b5e82eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3fdf3040-3ac2-4d47-9924-ce5daaf97cdc" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_7eb0b418-80f1-4e10-b59a-e62a2b5e82eb" xlink:to="loc_dei_EntityDomain_3fdf3040-3ac2-4d47-9924-ce5daaf97cdc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_3ae01ff9-e024-408b-a687-6f8b2ea910ea" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_3fdf3040-3ac2-4d47-9924-ce5daaf97cdc" xlink:to="loc_aal_AmericanAirlinesIncMember_3ae01ff9-e024-408b-a687-6f8b2ea910ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CashFlowLesseeAbstract_105908ab-8bc6-4633-8ff0-4d2025146466" xlink:href="aal-20251231.xsd#aal_CashFlowLesseeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f63c8dd1-785a-4ea1-9045-754859b8a6b1" xlink:to="loc_aal_CashFlowLesseeAbstract_105908ab-8bc6-4633-8ff0-4d2025146466" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_2f944b25-af5c-4cf6-9284-513bafd7422e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeasePayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_CashFlowLesseeAbstract_105908ab-8bc6-4633-8ff0-4d2025146466" xlink:to="loc_us-gaap_OperatingLeasePayments_2f944b25-af5c-4cf6-9284-513bafd7422e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_f434fa35-9480-404e-b36f-79eb0444c567" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseInterestPaymentOnLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_CashFlowLesseeAbstract_105908ab-8bc6-4633-8ff0-4d2025146466" xlink:to="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_f434fa35-9480-404e-b36f-79eb0444c567" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_6c1f72c1-00d0-42d0-b39a-21d9cd227137" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeasePrincipalPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_CashFlowLesseeAbstract_105908ab-8bc6-4633-8ff0-4d2025146466" xlink:to="loc_us-gaap_FinanceLeasePrincipalPayments_6c1f72c1-00d0-42d0-b39a-21d9cd227137" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleAndLeasebackTransactionGainLossNet_474300f9-b65c-4af8-a310-f47a5057553d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleAndLeasebackTransactionGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f63c8dd1-785a-4ea1-9045-754859b8a6b1" xlink:to="loc_us-gaap_SaleAndLeasebackTransactionGainLossNet_474300f9-b65c-4af8-a310-f47a5057553d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/LeasesMaturitiesofLeaseLiabilitiesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#LeasesMaturitiesofLeaseLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/LeasesMaturitiesofLeaseLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_42ec5906-2efc-440d-aed4-0ea415581fc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_bc49d1a2-80cc-4ac9-979c-f6f6a76ff8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_42ec5906-2efc-440d-aed4-0ea415581fc9" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_bc49d1a2-80cc-4ac9-979c-f6f6a76ff8a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_e8dc89cc-6353-42a8-bc13-35c4f45948a3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_bc49d1a2-80cc-4ac9-979c-f6f6a76ff8a7" xlink:to="loc_dei_LegalEntityAxis_e8dc89cc-6353-42a8-bc13-35c4f45948a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e8dc89cc-6353-42a8-bc13-35c4f45948a3_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_e8dc89cc-6353-42a8-bc13-35c4f45948a3" xlink:to="loc_dei_EntityDomain_e8dc89cc-6353-42a8-bc13-35c4f45948a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_31938985-9161-4159-a86a-568f0963a2d7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_e8dc89cc-6353-42a8-bc13-35c4f45948a3" xlink:to="loc_dei_EntityDomain_31938985-9161-4159-a86a-568f0963a2d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_54101b92-78af-4249-84ca-1a7b711e54ef" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_31938985-9161-4159-a86a-568f0963a2d7" xlink:to="loc_aal_AmericanAirlinesIncMember_54101b92-78af-4249-84ca-1a7b711e54ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_42ec5906-2efc-440d-aed4-0ea415581fc9" xlink:to="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_79e9997e-3d54-4797-9d36-1564a789cc73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_79e9997e-3d54-4797-9d36-1564a789cc73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0c9818cd-23c3-4165-ae0a-626240291af8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0c9818cd-23c3-4165-ae0a-626240291af8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9d610e49-037b-4649-8f93-8df8d1d008de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9d610e49-037b-4649-8f93-8df8d1d008de" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_12fb312d-ae75-4f17-a788-8939dcdc0939" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_12fb312d-ae75-4f17-a788-8939dcdc0939" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_2193f526-17b2-45c4-abdb-f7cac5078767" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_2193f526-17b2-45c4-abdb-f7cac5078767" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_70118258-70e4-4b2f-afb3-9704a3f88cad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_70118258-70e4-4b2f-afb3-9704a3f88cad" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_cc17be20-e716-4714-b1cf-1b72040bb98e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_cc17be20-e716-4714-b1cf-1b72040bb98e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_47298e94-e9f0-4b3e-908a-47fc288e45a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_47298e94-e9f0-4b3e-908a-47fc288e45a8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_1eff7774-2f22-4ca0-82ba-b5f13bb3cae3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:to="loc_us-gaap_OperatingLeaseLiability_1eff7774-2f22-4ca0-82ba-b5f13bb3cae3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_bc9447c0-604a-4efa-857d-9826c55b8abb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_bc9447c0-604a-4efa-857d-9826c55b8abb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_a4dda4c4-4ea3-4868-820c-cb91c85cc569" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_a10fcd8a-514c-45eb-af29-41f597d1b3a5" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_a4dda4c4-4ea3-4868-820c-cb91c85cc569" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_42ec5906-2efc-440d-aed4-0ea415581fc9" xlink:to="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_9f3298ca-248c-4c40-941f-f91c35a52149" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_9f3298ca-248c-4c40-941f-f91c35a52149" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_e828b39d-1352-4487-8b1c-600f38480169" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_e828b39d-1352-4487-8b1c-600f38480169" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_27b81198-9023-461d-9e27-0353b748c210" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_27b81198-9023-461d-9e27-0353b748c210" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_de28bfb2-4280-4ada-9828-70a6ae299f8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_de28bfb2-4280-4ada-9828-70a6ae299f8c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_61027395-742b-4957-bf83-7bc7cde79cf2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_61027395-742b-4957-bf83-7bc7cde79cf2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_e6726698-276f-4fc4-8092-efb92ea11b46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_e6726698-276f-4fc4-8092-efb92ea11b46" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_0894278d-e97f-4ad1-8375-c712d4af08cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_0894278d-e97f-4ad1-8375-c712d4af08cc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_6faa7744-e951-495f-8286-ff9c6d350b5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:to="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_6faa7744-e951-495f-8286-ff9c6d350b5f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_3dc6ad60-783a-41f5-a202-cce22ae4042d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:to="loc_us-gaap_FinanceLeaseLiability_3dc6ad60-783a-41f5-a202-cce22ae4042d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_461e54dd-3c3a-4741-8a67-2ac319278c83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_461e54dd-3c3a-4741-8a67-2ac319278c83" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_7b25a07f-62d6-4a6d-bde7-bad95fd0077c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_76584e19-a5fa-40bb-a0a2-ad529e1cade6" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_7b25a07f-62d6-4a6d-bde7-bad95fd0077c" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/IncomeTaxesComponentsofIncomeTaxProvisionBenefitDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#IncomeTaxesComponentsofIncomeTaxProvisionBenefitDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/IncomeTaxesComponentsofIncomeTaxProvisionBenefitDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aal_ComponentsOfIncomeTaxesLineItems_9654e9d9-ce25-45aa-9561-57e05c75549b" xlink:href="aal-20251231.xsd#aal_ComponentsOfIncomeTaxesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ComponentsOfIncomeTaxesTable_bfef53a6-e3ab-4412-9da5-88a59d4a34f9" xlink:href="aal-20251231.xsd#aal_ComponentsOfIncomeTaxesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_aal_ComponentsOfIncomeTaxesLineItems_9654e9d9-ce25-45aa-9561-57e05c75549b" xlink:to="loc_aal_ComponentsOfIncomeTaxesTable_bfef53a6-e3ab-4412-9da5-88a59d4a34f9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_fe6b463e-8dde-4c0b-8c81-5c01d177ab71" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_ComponentsOfIncomeTaxesTable_bfef53a6-e3ab-4412-9da5-88a59d4a34f9" xlink:to="loc_dei_LegalEntityAxis_fe6b463e-8dde-4c0b-8c81-5c01d177ab71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_fe6b463e-8dde-4c0b-8c81-5c01d177ab71_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_fe6b463e-8dde-4c0b-8c81-5c01d177ab71" xlink:to="loc_dei_EntityDomain_fe6b463e-8dde-4c0b-8c81-5c01d177ab71_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_1bd85d02-5f05-413d-a124-9bb1606a7a8e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_fe6b463e-8dde-4c0b-8c81-5c01d177ab71" xlink:to="loc_dei_EntityDomain_1bd85d02-5f05-413d-a124-9bb1606a7a8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_a406cb73-dfa4-418c-8f45-f947bcf9485a" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_1bd85d02-5f05-413d-a124-9bb1606a7a8e" xlink:to="loc_aal_AmericanAirlinesIncMember_a406cb73-dfa4-418c-8f45-f947bcf9485a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_0ac361ab-8a8b-4b44-b52c-577ddff4a306" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_ComponentsOfIncomeTaxesLineItems_9654e9d9-ce25-45aa-9561-57e05c75549b" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_0ac361ab-8a8b-4b44-b52c-577ddff4a306" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_41531fc3-920b-4ac4-bc9c-6ada3e175e43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_0ac361ab-8a8b-4b44-b52c-577ddff4a306" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_41531fc3-920b-4ac4-bc9c-6ada3e175e43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_34b0db21-e13d-4681-8c82-509a8a94fb63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_0ac361ab-8a8b-4b44-b52c-577ddff4a306" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_34b0db21-e13d-4681-8c82-509a8a94fb63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f661883b-52ea-4567-92a9-89bade017f33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_0ac361ab-8a8b-4b44-b52c-577ddff4a306" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f661883b-52ea-4567-92a9-89bade017f33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_2bc116b6-d539-4b45-a196-86ff9851181c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_ComponentsOfIncomeTaxesLineItems_9654e9d9-ce25-45aa-9561-57e05c75549b" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_2bc116b6-d539-4b45-a196-86ff9851181c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/IncomeTaxesReconciliationofIncomeTaxProvisionDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#IncomeTaxesReconciliationofIncomeTaxProvisionDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/IncomeTaxesReconciliationofIncomeTaxProvisionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aal_IncomeTaxDisclosureLineItems_9334f3a1-8bb6-4ee5-8fa7-af96dd286d91" xlink:href="aal-20251231.xsd#aal_IncomeTaxDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ComponentsOfIncomeTaxesTable_85804f58-cc48-48da-b433-54ae976ca2e2" xlink:href="aal-20251231.xsd#aal_ComponentsOfIncomeTaxesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_aal_IncomeTaxDisclosureLineItems_9334f3a1-8bb6-4ee5-8fa7-af96dd286d91" xlink:to="loc_aal_ComponentsOfIncomeTaxesTable_85804f58-cc48-48da-b433-54ae976ca2e2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_68fd7c04-1412-4619-a57f-57022edee623" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_ComponentsOfIncomeTaxesTable_85804f58-cc48-48da-b433-54ae976ca2e2" xlink:to="loc_dei_LegalEntityAxis_68fd7c04-1412-4619-a57f-57022edee623" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_68fd7c04-1412-4619-a57f-57022edee623_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_68fd7c04-1412-4619-a57f-57022edee623" xlink:to="loc_dei_EntityDomain_68fd7c04-1412-4619-a57f-57022edee623_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_26ab2727-2a2b-4f12-885c-c670887e126c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_68fd7c04-1412-4619-a57f-57022edee623" xlink:to="loc_dei_EntityDomain_26ab2727-2a2b-4f12-885c-c670887e126c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_bde5584e-14b8-44c2-bc33-d6e8e20f6943" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_26ab2727-2a2b-4f12-885c-c670887e126c" xlink:to="loc_aal_AmericanAirlinesIncMember_bde5584e-14b8-44c2-bc33-d6e8e20f6943" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019bb3bd-e454-7fc6-a9fc-d6c7679fef43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxDisclosureLineItems_9334f3a1-8bb6-4ee5-8fa7-af96dd286d91" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019bb3bd-e454-7fc6-a9fc-d6c7679fef43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_807d38d5-e755-4cca-a3a5-ec3dd84ee5e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019bb3bd-e454-7fc6-a9fc-d6c7679fef43" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_807d38d5-e755-4cca-a3a5-ec3dd84ee5e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_EffectiveIncomeTaxRateReconciliationDomesticFederalAmountAbstract_019bb3cb-eb0f-7236-8f6d-acd59d405f4e" xlink:href="aal-20251231.xsd#aal_EffectiveIncomeTaxRateReconciliationDomesticFederalAmountAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019bb3bd-e454-7fc6-a9fc-d6c7679fef43" xlink:to="loc_aal_EffectiveIncomeTaxRateReconciliationDomesticFederalAmountAbstract_019bb3cb-eb0f-7236-8f6d-acd59d405f4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseAbstract_019c52c9-4bce-7bf1-86a5-1e779612fbff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_EffectiveIncomeTaxRateReconciliationDomesticFederalAmountAbstract_019bb3cb-eb0f-7236-8f6d-acd59d405f4e" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseAbstract_019c52c9-4bce-7bf1-86a5-1e779612fbff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEmployeeBenefitsAmount_019bb3c6-c2c9-760c-81bc-fe3956376ce1" xlink:href="aal-20251231.xsd#aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEmployeeBenefitsAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseAbstract_019c52c9-4bce-7bf1-86a5-1e779612fbff" xlink:to="loc_aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEmployeeBenefitsAmount_019bb3c6-c2c9-760c-81bc-fe3956376ce1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationAmount_019bb3c7-dcdb-773c-ad09-e7703dc3d808" xlink:href="aal-20251231.xsd#aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseAbstract_019c52c9-4bce-7bf1-86a5-1e779612fbff" xlink:to="loc_aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationAmount_019bb3c7-dcdb-773c-ad09-e7703dc3d808" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_ec839bbd-52a3-4b8b-a12d-28e1b1e7617d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseAbstract_019c52c9-4bce-7bf1-86a5-1e779612fbff" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_ec839bbd-52a3-4b8b-a12d-28e1b1e7617d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_019c52ca-efa0-77c0-981b-f676262fb271" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019bb3bd-e454-7fc6-a9fc-d6c7679fef43" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_019c52ca-efa0-77c0-981b-f676262fb271" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_019bb3ca-5295-7ce9-8152-b687c3adba46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019bb3bd-e454-7fc6-a9fc-d6c7679fef43" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_019bb3ca-5295-7ce9-8152-b687c3adba46" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_110841be-1252-4673-9975-a51f0369bfa6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019bb3bd-e454-7fc6-a9fc-d6c7679fef43" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_110841be-1252-4673-9975-a51f0369bfa6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019bb3bd-7794-77e0-8846-aab9129201c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxDisclosureLineItems_9334f3a1-8bb6-4ee5-8fa7-af96dd286d91" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019bb3bd-7794-77e0-8846-aab9129201c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019bb3be-9952-73b3-8e3f-fa793e4d7f0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019bb3bd-7794-77e0-8846-aab9129201c7" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019bb3be-9952-73b3-8e3f-fa793e4d7f0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_EffectiveIncomeTaxRateReconciliationDomesticFederalPercentAbstract_019bb3cc-4a7e-714d-90cb-7200d4d39c0e" xlink:href="aal-20251231.xsd#aal_EffectiveIncomeTaxRateReconciliationDomesticFederalPercentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019bb3bd-7794-77e0-8846-aab9129201c7" xlink:to="loc_aal_EffectiveIncomeTaxRateReconciliationDomesticFederalPercentAbstract_019bb3cc-4a7e-714d-90cb-7200d4d39c0e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAbstract_019c52ca-142e-72bd-86d7-9ab66857ab4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_EffectiveIncomeTaxRateReconciliationDomesticFederalPercentAbstract_019bb3cc-4a7e-714d-90cb-7200d4d39c0e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAbstract_019c52ca-142e-72bd-86d7-9ab66857ab4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEmployeeBenefitsPercent_019bb3c7-2371-7633-90bd-3c4e070fb51d" xlink:href="aal-20251231.xsd#aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEmployeeBenefitsPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAbstract_019c52ca-142e-72bd-86d7-9ab66857ab4f" xlink:to="loc_aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEmployeeBenefitsPercent_019bb3c7-2371-7633-90bd-3c4e070fb51d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationPercent_019bb3c8-4e6b-7ab7-98a8-10fa5cf5328c" xlink:href="aal-20251231.xsd#aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAbstract_019c52ca-142e-72bd-86d7-9ab66857ab4f" xlink:to="loc_aal_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationPercent_019bb3c8-4e6b-7ab7-98a8-10fa5cf5328c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_019bb3c1-a584-74a8-a676-69fed30746f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAbstract_019c52ca-142e-72bd-86d7-9ab66857ab4f" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_019bb3c1-a584-74a8-a676-69fed30746f2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_019c52ca-efa0-7305-ab27-679db3fd78d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019bb3bd-7794-77e0-8846-aab9129201c7" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_019c52ca-efa0-7305-ab27-679db3fd78d3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_019bb3ca-6dc0-7c02-a5cd-18bd4649c81c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019bb3bd-7794-77e0-8846-aab9129201c7" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_019bb3ca-6dc0-7c02-a5cd-18bd4649c81c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019bb3c3-8fff-7f40-b690-9457e4aa10df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019bb3bd-7794-77e0-8846-aab9129201c7" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019bb3c3-8fff-7f40-b690-9457e4aa10df" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_3ba3069c-3223-4ab1-8b65-7c94743efd4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLossCarryforwardsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_ceb763d4-c16c-48d9-9ba6-faaa8ede7baa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLossCarryforwardsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3ba3069c-3223-4ab1-8b65-7c94743efd4b" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_ceb763d4-c16c-48d9-9ba6-faaa8ede7baa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_a4fbc4a1-c582-4324-b152-1efc9b616edc" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_ceb763d4-c16c-48d9-9ba6-faaa8ede7baa" xlink:to="loc_dei_LegalEntityAxis_a4fbc4a1-c582-4324-b152-1efc9b616edc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a4fbc4a1-c582-4324-b152-1efc9b616edc_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_a4fbc4a1-c582-4324-b152-1efc9b616edc" xlink:to="loc_dei_EntityDomain_a4fbc4a1-c582-4324-b152-1efc9b616edc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_4d1d2f50-a59c-4d8a-b669-f9c2e97effcb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_a4fbc4a1-c582-4324-b152-1efc9b616edc" xlink:to="loc_dei_EntityDomain_4d1d2f50-a59c-4d8a-b669-f9c2e97effcb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_53c58798-edc3-4347-a407-8beb7ad99747" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4d1d2f50-a59c-4d8a-b669-f9c2e97effcb" xlink:to="loc_aal_AmericanAirlinesIncMember_53c58798-edc3-4347-a407-8beb7ad99747" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3ba3069c-3223-4ab1-8b65-7c94743efd4b" xlink:to="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DeferredTaxAssetsOperatingLossCarryforwardsAndOtherCarryforwards_da6c181c-db3b-4a0a-ad12-8ab99144f063" xlink:href="aal-20251231.xsd#aal_DeferredTaxAssetsOperatingLossCarryforwardsAndOtherCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:to="loc_aal_DeferredTaxAssetsOperatingLossCarryforwardsAndOtherCarryforwards_da6c181c-db3b-4a0a-ad12-8ab99144f063" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsFrequentFlierLiability_048495db-f11c-42b7-a25b-de5137ebbfad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsFrequentFlierLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:to="loc_us-gaap_DeferredTaxAssetsFrequentFlierLiability_048495db-f11c-42b7-a25b-de5137ebbfad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DeferredTaxAssetsLeases_9449916d-ba3a-46fb-bf50-65ce88a9816a" xlink:href="aal-20251231.xsd#aal_DeferredTaxAssetsLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:to="loc_aal_DeferredTaxAssetsLeases_9449916d-ba3a-46fb-bf50-65ce88a9816a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions_677a69b2-1e2f-4d64-8fdd-5b9aad2a6074" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions_677a69b2-1e2f-4d64-8fdd-5b9aad2a6074" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits_a6bc0289-9b69-4536-b5bd-0a9f0d375654" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits_a6bc0289-9b69-4536-b5bd-0a9f0d375654" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent_96fdc2ce-6f4b-435c-99c0-67e3e9a3dd2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent_96fdc2ce-6f4b-435c-99c0-67e3e9a3dd2a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_296ff317-7dd2-40ba-9b55-8aa33b14854d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_296ff317-7dd2-40ba-9b55-8aa33b14854d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_72cf8f48-bba4-48e3-b8e0-848830e4f7f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_72cf8f48-bba4-48e3-b8e0-848830e4f7f4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_23328649-7f1b-44f9-ba63-a38774b30c13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_23328649-7f1b-44f9-ba63-a38774b30c13" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_0a0b26ba-5269-4a35-a7bf-91532ad828a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetsNetAbstract_0d11ba35-92ae-48e5-b3a6-4c1babf607e9" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_0a0b26ba-5269-4a35-a7bf-91532ad828a4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesNetAbstract_e2db563d-e327-48ea-88b0-391a4b149969" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilitiesNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3ba3069c-3223-4ab1-8b65-7c94743efd4b" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesNetAbstract_e2db563d-e327-48ea-88b0-391a4b149969" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DeferredTaxLiabilitiesAcceleratedDepreciationAndAmortization_bf6790ff-7f25-4960-bcbe-5181419eca60" xlink:href="aal-20251231.xsd#aal_DeferredTaxLiabilitiesAcceleratedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxLiabilitiesNetAbstract_e2db563d-e327-48ea-88b0-391a4b149969" xlink:to="loc_aal_DeferredTaxLiabilitiesAcceleratedDepreciationAndAmortization_bf6790ff-7f25-4960-bcbe-5181419eca60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_0a6f3358-0ea3-447e-bfd1-fd8a1b22db10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilitiesLeasingArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxLiabilitiesNetAbstract_e2db563d-e327-48ea-88b0-391a4b149969" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_0a6f3358-0ea3-447e-bfd1-fd8a1b22db10" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_b6b1ee33-2325-4931-b0c4-909acd266705" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxLiabilitiesNetAbstract_e2db563d-e327-48ea-88b0-391a4b149969" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_b6b1ee33-2325-4931-b0c4-909acd266705" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_8477fe63-75a6-450b-8aa0-f1272205c2ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxLiabilitiesNetAbstract_e2db563d-e327-48ea-88b0-391a4b149969" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_8477fe63-75a6-450b-8aa0-f1272205c2ab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_6d087791-7572-4569-8f34-a46af986a269" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3ba3069c-3223-4ab1-8b65-7c94743efd4b" xlink:to="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_6d087791-7572-4569-8f34-a46af986a269" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/IncomeTaxesAdditionalInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#IncomeTaxesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/IncomeTaxesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aal_IncomeTaxesLineItems_ce42d65d-7278-4057-9574-67cfdb1db6f8" xlink:href="aal-20251231.xsd#aal_IncomeTaxesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_IncomeTaxesTable_fc7cc313-739a-4c31-a39a-a552bc0c53d5" xlink:href="aal-20251231.xsd#aal_IncomeTaxesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_aal_IncomeTaxesLineItems_ce42d65d-7278-4057-9574-67cfdb1db6f8" xlink:to="loc_aal_IncomeTaxesTable_fc7cc313-739a-4c31-a39a-a552bc0c53d5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_fe8ac570-fe94-4e88-9540-87d15e527f2e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_IncomeTaxesTable_fc7cc313-739a-4c31-a39a-a552bc0c53d5" xlink:to="loc_dei_LegalEntityAxis_fe8ac570-fe94-4e88-9540-87d15e527f2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_fe8ac570-fe94-4e88-9540-87d15e527f2e_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_fe8ac570-fe94-4e88-9540-87d15e527f2e" xlink:to="loc_dei_EntityDomain_fe8ac570-fe94-4e88-9540-87d15e527f2e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_4ac1f5cd-b180-4d20-bdbf-153bba7e16bf" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_fe8ac570-fe94-4e88-9540-87d15e527f2e" xlink:to="loc_dei_EntityDomain_4ac1f5cd-b180-4d20-bdbf-153bba7e16bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_e0a9d303-9d3b-4f5c-b920-be9c1f5e4c6d" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4ac1f5cd-b180-4d20-bdbf-153bba7e16bf" xlink:to="loc_aal_AmericanAirlinesIncMember_e0a9d303-9d3b-4f5c-b920-be9c1f5e4c6d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_690546f6-65a6-43c2-9473-592b5a6b4599" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_aal_IncomeTaxesTable_fc7cc313-739a-4c31-a39a-a552bc0c53d5" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_690546f6-65a6-43c2-9473-592b5a6b4599" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_690546f6-65a6-43c2-9473-592b5a6b4599_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_690546f6-65a6-43c2-9473-592b5a6b4599" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_690546f6-65a6-43c2-9473-592b5a6b4599_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_98042732-3020-498a-bfe0-55faff805bed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_690546f6-65a6-43c2-9473-592b5a6b4599" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_98042732-3020-498a-bfe0-55faff805bed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_31086b54-1baf-4ac1-a00d-7687521a0a2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_98042732-3020-498a-bfe0-55faff805bed" xlink:to="loc_us-gaap_DomesticCountryMember_31086b54-1baf-4ac1-a00d-7687521a0a2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_161d7748-6ceb-423d-b1b6-c4c1bbb5e32a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_98042732-3020-498a-bfe0-55faff805bed" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_161d7748-6ceb-423d-b1b6-c4c1bbb5e32a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_fc881f6e-a022-47ec-ad74-5472a445ad59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxesLineItems_ce42d65d-7278-4057-9574-67cfdb1db6f8" xlink:to="loc_us-gaap_OperatingLossCarryforwards_fc881f6e-a022-47ec-ad74-5472a445ad59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OtherCarryforwards_060fe8ca-8fa1-4446-9eff-8ad8a9b36703" xlink:href="aal-20251231.xsd#aal_OtherCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxesLineItems_ce42d65d-7278-4057-9574-67cfdb1db6f8" xlink:to="loc_aal_OtherCarryforwards_060fe8ca-8fa1-4446-9eff-8ad8a9b36703" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OperatingLossCarryforwardsAndOtherCarryforwardsSubjectToExpiration_0e911b2d-5422-4b94-97b3-c8e94d578ca5" xlink:href="aal-20251231.xsd#aal_OperatingLossCarryforwardsAndOtherCarryforwardsSubjectToExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxesLineItems_ce42d65d-7278-4057-9574-67cfdb1db6f8" xlink:to="loc_aal_OperatingLossCarryforwardsAndOtherCarryforwardsSubjectToExpiration_0e911b2d-5422-4b94-97b3-c8e94d578ca5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OperatingLossCarryforwardsAndOtherCarryforwardsNotSubjectToExpiration_1db17eec-4122-4348-a08d-bee4308cabed" xlink:href="aal-20251231.xsd#aal_OperatingLossCarryforwardsAndOtherCarryforwardsNotSubjectToExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxesLineItems_ce42d65d-7278-4057-9574-67cfdb1db6f8" xlink:to="loc_aal_OperatingLossCarryforwardsAndOtherCarryforwardsNotSubjectToExpiration_1db17eec-4122-4348-a08d-bee4308cabed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_fc18038c-3295-467a-963b-9754f730a1a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxesLineItems_ce42d65d-7278-4057-9574-67cfdb1db6f8" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_fc18038c-3295-467a-963b-9754f730a1a4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c8f47bbb-de82-468b-986d-b0b13246ca93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_IncomeTaxesLineItems_ce42d65d-7278-4057-9574-67cfdb1db6f8" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c8f47bbb-de82-468b-986d-b0b13246ca93" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/FairValueMeasurementsSummaryofAssetsMeasuredatFairValueonRecurringBasisDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#FairValueMeasurementsSummaryofAssetsMeasuredatFairValueonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/FairValueMeasurementsSummaryofAssetsMeasuredatFairValueonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a1827fa1-b12c-4b3f-bdb6-b25af89443ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c5764882-e557-4aa5-9bcf-be70f234f080" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a1827fa1-b12c-4b3f-bdb6-b25af89443ed" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c5764882-e557-4aa5-9bcf-be70f234f080" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_6c9cb51d-7271-4df7-adae-06160a2bdfda" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c5764882-e557-4aa5-9bcf-be70f234f080" xlink:to="loc_dei_LegalEntityAxis_6c9cb51d-7271-4df7-adae-06160a2bdfda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6c9cb51d-7271-4df7-adae-06160a2bdfda_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_6c9cb51d-7271-4df7-adae-06160a2bdfda" xlink:to="loc_dei_EntityDomain_6c9cb51d-7271-4df7-adae-06160a2bdfda_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_908e41cb-cf02-4608-97de-43a8cd7cad81" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_6c9cb51d-7271-4df7-adae-06160a2bdfda" xlink:to="loc_dei_EntityDomain_908e41cb-cf02-4608-97de-43a8cd7cad81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_e257cf8c-ae72-46b3-ac32-64682394c8c4" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_908e41cb-cf02-4608-97de-43a8cd7cad81" xlink:to="loc_aal_AmericanAirlinesIncMember_e257cf8c-ae72-46b3-ac32-64682394c8c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_e21ff7d9-29ef-4941-a130-6d802c6aa280" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c5764882-e557-4aa5-9bcf-be70f234f080" xlink:to="loc_us-gaap_FinancialInstrumentAxis_e21ff7d9-29ef-4941-a130-6d802c6aa280" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e21ff7d9-29ef-4941-a130-6d802c6aa280_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_e21ff7d9-29ef-4941-a130-6d802c6aa280" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e21ff7d9-29ef-4941-a130-6d802c6aa280_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3286bdf4-049a-4259-ac20-d82cf21fa2cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_e21ff7d9-29ef-4941-a130-6d802c6aa280" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3286bdf4-049a-4259-ac20-d82cf21fa2cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_338d96c2-4e9a-42bc-aefc-56e3033b9c0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3286bdf4-049a-4259-ac20-d82cf21fa2cf" xlink:to="loc_us-gaap_MoneyMarketFundsMember_338d96c2-4e9a-42bc-aefc-56e3033b9c0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_e129f10d-b09c-41aa-a4a6-74f82289b4a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3286bdf4-049a-4259-ac20-d82cf21fa2cf" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_e129f10d-b09c-41aa-a4a6-74f82289b4a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankTimeDepositsMember_bb1cce5d-5af3-4881-b47e-50373a5ab980" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BankTimeDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3286bdf4-049a-4259-ac20-d82cf21fa2cf" xlink:to="loc_us-gaap_BankTimeDepositsMember_bb1cce5d-5af3-4881-b47e-50373a5ab980" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepurchaseAgreementsMember_68bf6fb6-5715-4bea-9b31-2f4649e7a713" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepurchaseAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3286bdf4-049a-4259-ac20-d82cf21fa2cf" xlink:to="loc_us-gaap_RepurchaseAgreementsMember_68bf6fb6-5715-4bea-9b31-2f4649e7a713" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f506d835-5e4e-4e13-878f-8afb129368d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c5764882-e557-4aa5-9bcf-be70f234f080" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f506d835-5e4e-4e13-878f-8afb129368d0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f506d835-5e4e-4e13-878f-8afb129368d0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f506d835-5e4e-4e13-878f-8afb129368d0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f506d835-5e4e-4e13-878f-8afb129368d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_3c4086a2-cd41-4c7d-91fe-341142cfcf17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f506d835-5e4e-4e13-878f-8afb129368d0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_3c4086a2-cd41-4c7d-91fe-341142cfcf17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_49d7dbeb-7321-442b-8a73-61733e4a0c17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_3c4086a2-cd41-4c7d-91fe-341142cfcf17" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_49d7dbeb-7321-442b-8a73-61733e4a0c17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_d3474b84-191a-4213-a28f-8a913c4e385a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_3c4086a2-cd41-4c7d-91fe-341142cfcf17" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_d3474b84-191a-4213-a28f-8a913c4e385a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_6da38e02-0932-46b3-bcdc-527ac978a5d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_3c4086a2-cd41-4c7d-91fe-341142cfcf17" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_6da38e02-0932-46b3-bcdc-527ac978a5d6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_4d8f6d1b-2e6f-4498-a2ba-b20a1871d16c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a1827fa1-b12c-4b3f-bdb6-b25af89443ed" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_4d8f6d1b-2e6f-4498-a2ba-b20a1871d16c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RestrictedCashAndShortTermInvestmentsFairValueDisclosure_72936e9b-0551-49ac-a148-e0bb4d29f95f" xlink:href="aal-20251231.xsd#aal_RestrictedCashAndShortTermInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a1827fa1-b12c-4b3f-bdb6-b25af89443ed" xlink:to="loc_aal_RestrictedCashAndShortTermInvestmentsFairValueDisclosure_72936e9b-0551-49ac-a148-e0bb4d29f95f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LongTermInvestmentsFairValueDisclosure_0a6bde91-e9bf-48cf-b547-aa8188841f01" xlink:href="aal-20251231.xsd#aal_LongTermInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a1827fa1-b12c-4b3f-bdb6-b25af89443ed" xlink:to="loc_aal_LongTermInvestmentsFairValueDisclosure_0a6bde91-e9bf-48cf-b547-aa8188841f01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_61420dee-b264-42c6-b609-9868dde80adb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a1827fa1-b12c-4b3f-bdb6-b25af89443ed" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_61420dee-b264-42c6-b609-9868dde80adb" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/FairValueMeasurementsAdditionalInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#FairValueMeasurementsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/FairValueMeasurementsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7d81ca7-43bc-47a5-9c9c-1e822fedffc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_044fe843-3d80-4840-9d67-b9899c648be6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7d81ca7-43bc-47a5-9c9c-1e822fedffc9" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_044fe843-3d80-4840-9d67-b9899c648be6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_defa4824-0448-4d49-8628-13a6da05f3b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_044fe843-3d80-4840-9d67-b9899c648be6" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_defa4824-0448-4d49-8628-13a6da05f3b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_defa4824-0448-4d49-8628-13a6da05f3b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_defa4824-0448-4d49-8628-13a6da05f3b8" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_defa4824-0448-4d49-8628-13a6da05f3b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4d9b0d2a-ae88-439e-b73e-d1a9f701e3b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_defa4824-0448-4d49-8628-13a6da05f3b8" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4d9b0d2a-ae88-439e-b73e-d1a9f701e3b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_81b1c348-f3a7-4cfe-8463-ca4581f26894" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4d9b0d2a-ae88-439e-b73e-d1a9f701e3b2" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_81b1c348-f3a7-4cfe-8463-ca4581f26894" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_53111cb5-9c12-463d-aaf7-bf83ebd78f5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_044fe843-3d80-4840-9d67-b9899c648be6" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_53111cb5-9c12-463d-aaf7-bf83ebd78f5f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_53111cb5-9c12-463d-aaf7-bf83ebd78f5f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_53111cb5-9c12-463d-aaf7-bf83ebd78f5f" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_53111cb5-9c12-463d-aaf7-bf83ebd78f5f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_ce0cea41-c541-4004-a409-451184b8c411" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_53111cb5-9c12-463d-aaf7-bf83ebd78f5f" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_ce0cea41-c541-4004-a409-451184b8c411" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_74d2e207-a529-4381-a10a-734411bc155c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_ce0cea41-c541-4004-a409-451184b8c411" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_74d2e207-a529-4381-a10a-734411bc155c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_15d9332a-f777-4de6-a047-ff84062d9566" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_74d2e207-a529-4381-a10a-734411bc155c" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_15d9332a-f777-4de6-a047-ff84062d9566" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_4d228193-ad9e-408e-9f03-22336881a036" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_044fe843-3d80-4840-9d67-b9899c648be6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_4d228193-ad9e-408e-9f03-22336881a036" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4d228193-ad9e-408e-9f03-22336881a036_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4d228193-ad9e-408e-9f03-22336881a036" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4d228193-ad9e-408e-9f03-22336881a036_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9674494c-c441-47c7-af35-54336884fcee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4d228193-ad9e-408e-9f03-22336881a036" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9674494c-c441-47c7-af35-54336884fcee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_ddb01d7b-b496-4ffa-b84d-8a1cb4178ce3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_9674494c-c441-47c7-af35-54336884fcee" xlink:to="loc_us-gaap_ConvertibleDebtMember_ddb01d7b-b496-4ffa-b84d-8a1cb4178ce3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_0413315f-d760-4f34-aff3-777b1d6fe511" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7d81ca7-43bc-47a5-9c9c-1e822fedffc9" xlink:to="loc_us-gaap_LongTermDebtFairValue_0413315f-d760-4f34-aff3-777b1d6fe511" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/FairValueMeasurementsScheduleofCarryingValueandEstimatedFairValueofLongTermDebtIncludingCurrentMaturitiesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#FairValueMeasurementsScheduleofCarryingValueandEstimatedFairValueofLongTermDebtIncludingCurrentMaturitiesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/FairValueMeasurementsScheduleofCarryingValueandEstimatedFairValueofLongTermDebtIncludingCurrentMaturitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a55a287d-151e-470e-bcfe-000097eeda3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3efc3b91-74a4-4df7-8ef6-a77cb88ceb79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a55a287d-151e-470e-bcfe-000097eeda3c" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3efc3b91-74a4-4df7-8ef6-a77cb88ceb79" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_5eba7b78-5d4e-45d5-8f3e-260536c7d8ea" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3efc3b91-74a4-4df7-8ef6-a77cb88ceb79" xlink:to="loc_dei_LegalEntityAxis_5eba7b78-5d4e-45d5-8f3e-260536c7d8ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_5eba7b78-5d4e-45d5-8f3e-260536c7d8ea_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_5eba7b78-5d4e-45d5-8f3e-260536c7d8ea" xlink:to="loc_dei_EntityDomain_5eba7b78-5d4e-45d5-8f3e-260536c7d8ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_fd0f4220-6ed3-4cd1-8719-cf19c11aad8f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_5eba7b78-5d4e-45d5-8f3e-260536c7d8ea" xlink:to="loc_dei_EntityDomain_fd0f4220-6ed3-4cd1-8719-cf19c11aad8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_3b35efbc-a157-415d-b8a4-2fd2556ce155" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_fd0f4220-6ed3-4cd1-8719-cf19c11aad8f" xlink:to="loc_aal_AmericanAirlinesIncMember_3b35efbc-a157-415d-b8a4-2fd2556ce155" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_918d0a59-6a4a-4639-af39-29cb147e1922" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3efc3b91-74a4-4df7-8ef6-a77cb88ceb79" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_918d0a59-6a4a-4639-af39-29cb147e1922" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_918d0a59-6a4a-4639-af39-29cb147e1922_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_918d0a59-6a4a-4639-af39-29cb147e1922" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_918d0a59-6a4a-4639-af39-29cb147e1922_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_628e6aeb-9dee-47c1-952d-6bdc77202448" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_918d0a59-6a4a-4639-af39-29cb147e1922" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_628e6aeb-9dee-47c1-952d-6bdc77202448" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_7126bc79-c1d7-4ccb-9195-60f865b8be9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_628e6aeb-9dee-47c1-952d-6bdc77202448" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_7126bc79-c1d7-4ccb-9195-60f865b8be9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_3502d485-6756-4aac-b0e5-9e2f5f14a276" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_7126bc79-c1d7-4ccb-9195-60f865b8be9b" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_3502d485-6756-4aac-b0e5-9e2f5f14a276" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_b374ed6f-e01d-4411-a245-bf1cb7573a00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_7126bc79-c1d7-4ccb-9195-60f865b8be9b" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_b374ed6f-e01d-4411-a245-bf1cb7573a00" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c579c887-b900-4119-8e92-bfced4683f6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3efc3b91-74a4-4df7-8ef6-a77cb88ceb79" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c579c887-b900-4119-8e92-bfced4683f6a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c579c887-b900-4119-8e92-bfced4683f6a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c579c887-b900-4119-8e92-bfced4683f6a" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c579c887-b900-4119-8e92-bfced4683f6a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6c5cde3f-de19-46ce-8995-d70452b30501" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c579c887-b900-4119-8e92-bfced4683f6a" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6c5cde3f-de19-46ce-8995-d70452b30501" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_6f45d8d1-640d-45a1-a5a2-4673338e2521" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6c5cde3f-de19-46ce-8995-d70452b30501" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_6f45d8d1-640d-45a1-a5a2-4673338e2521" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_14a3aab9-0b72-4a03-982a-a45b08211f10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6c5cde3f-de19-46ce-8995-d70452b30501" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_14a3aab9-0b72-4a03-982a-a45b08211f10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_626d85e6-2df9-4b3e-a5a1-00cb4ab3b7a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6c5cde3f-de19-46ce-8995-d70452b30501" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_626d85e6-2df9-4b3e-a5a1-00cb4ab3b7a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_2bc81cee-f974-45cc-9eee-e32efdd90c0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a55a287d-151e-470e-bcfe-000097eeda3c" xlink:to="loc_us-gaap_LongTermDebtFairValue_2bc81cee-f974-45cc-9eee-e32efdd90c0a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/InvestmentsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#InvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/InvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_648370b8-42df-4de7-b2e9-b33f0179ae9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f6f08b46-52c4-4ad2-9797-7e2927458be0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_648370b8-42df-4de7-b2e9-b33f0179ae9d" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f6f08b46-52c4-4ad2-9797-7e2927458be0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aa8a4dd8-2a94-40bf-a893-f2d87545f905" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f6f08b46-52c4-4ad2-9797-7e2927458be0" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aa8a4dd8-2a94-40bf-a893-f2d87545f905" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_aa8a4dd8-2a94-40bf-a893-f2d87545f905_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aa8a4dd8-2a94-40bf-a893-f2d87545f905" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_aa8a4dd8-2a94-40bf-a893-f2d87545f905_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_1f72f1f5-87cd-4abf-8f35-957f20c1ceea" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aa8a4dd8-2a94-40bf-a893-f2d87545f905" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_1f72f1f5-87cd-4abf-8f35-957f20c1ceea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RepublicAirlineIncMember_28bdf70d-7d20-465e-ac0d-1bd2fb91ac7e" xlink:href="aal-20251231.xsd#aal_RepublicAirlineIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_1f72f1f5-87cd-4abf-8f35-957f20c1ceea" xlink:to="loc_aal_RepublicAirlineIncMember_28bdf70d-7d20-465e-ac0d-1bd2fb91ac7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_3c59f89b-0f00-468d-8a14-fbae771b1ce7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f6f08b46-52c4-4ad2-9797-7e2927458be0" xlink:to="loc_srt_OwnershipAxis_3c59f89b-0f00-468d-8a14-fbae771b1ce7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_3c59f89b-0f00-468d-8a14-fbae771b1ce7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_3c59f89b-0f00-468d-8a14-fbae771b1ce7" xlink:to="loc_srt_OwnershipDomain_3c59f89b-0f00-468d-8a14-fbae771b1ce7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_9218d0f0-6609-4827-823c-855280491917" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_3c59f89b-0f00-468d-8a14-fbae771b1ce7" xlink:to="loc_srt_OwnershipDomain_9218d0f0-6609-4827-823c-855280491917" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ChinaSouthernAirlinesCompanyLimitedMember_ca5885ae-bfd8-4476-a7fb-47c01a42ed49" xlink:href="aal-20251231.xsd#aal_ChinaSouthernAirlinesCompanyLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_9218d0f0-6609-4827-823c-855280491917" xlink:to="loc_aal_ChinaSouthernAirlinesCompanyLimitedMember_ca5885ae-bfd8-4476-a7fb-47c01a42ed49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_3a64f951-5f2d-45a7-bbf6-ff1977ece22c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f6f08b46-52c4-4ad2-9797-7e2927458be0" xlink:to="loc_dei_LegalEntityAxis_3a64f951-5f2d-45a7-bbf6-ff1977ece22c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3a64f951-5f2d-45a7-bbf6-ff1977ece22c_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_3a64f951-5f2d-45a7-bbf6-ff1977ece22c" xlink:to="loc_dei_EntityDomain_3a64f951-5f2d-45a7-bbf6-ff1977ece22c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_36193359-0f87-448a-a11a-948dc04f0621" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_3a64f951-5f2d-45a7-bbf6-ff1977ece22c" xlink:to="loc_dei_EntityDomain_36193359-0f87-448a-a11a-948dc04f0621" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_08114570-3d4a-423c-8b60-4c02ec770604" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_36193359-0f87-448a-a11a-948dc04f0621" xlink:to="loc_aal_AmericanAirlinesIncMember_08114570-3d4a-423c-8b60-4c02ec770604" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_60bba16c-59b5-4ea5-926c-e1ee30b26162" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f6f08b46-52c4-4ad2-9797-7e2927458be0" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_60bba16c-59b5-4ea5-926c-e1ee30b26162" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_60bba16c-59b5-4ea5-926c-e1ee30b26162_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_60bba16c-59b5-4ea5-926c-e1ee30b26162" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_60bba16c-59b5-4ea5-926c-e1ee30b26162_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2c4774aa-77cc-482b-af8b-5023325121bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_60bba16c-59b5-4ea5-926c-e1ee30b26162" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2c4774aa-77cc-482b-af8b-5023325121bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_b79773d1-5e61-400d-8794-4b91a51412e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2c4774aa-77cc-482b-af8b-5023325121bc" xlink:to="loc_us-gaap_EquitySecuritiesMember_b79773d1-5e61-400d-8794-4b91a51412e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_3793fb41-0a6e-4939-a785-c59403c72e17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_648370b8-42df-4de7-b2e9-b33f0179ae9d" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_3793fb41-0a6e-4939-a785-c59403c72e17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_2ea52bd9-f4c1-43b3-9673-a9dbb63205c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_648370b8-42df-4de7-b2e9-b33f0179ae9d" xlink:to="loc_us-gaap_EquityMethodInvestments_2ea52bd9-f4c1-43b3-9673-a9dbb63205c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityOwnershipPercentageExcludingConsolidatedEntityAndEquityMethodInvestee_df7fd8ff-9603-4f1d-bbe1-e1381170b9b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityOwnershipPercentageExcludingConsolidatedEntityAndEquityMethodInvestee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_648370b8-42df-4de7-b2e9-b33f0179ae9d" xlink:to="loc_us-gaap_EquityOwnershipPercentageExcludingConsolidatedEntityAndEquityMethodInvestee_df7fd8ff-9603-4f1d-bbe1-e1381170b9b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_de91aaa4-5351-409f-825f-a4f8efa141fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_648370b8-42df-4de7-b2e9-b33f0179ae9d" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_de91aaa4-5351-409f-825f-a4f8efa141fc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_08655e48-4df3-4ebf-9ca3-2dd9522ac8c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_648370b8-42df-4de7-b2e9-b33f0179ae9d" xlink:to="loc_us-gaap_OtherInvestments_08655e48-4df3-4ebf-9ca3-2dd9522ac8c7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_0c11973b-d0fb-43b0-8e0c-a33167751fa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_648370b8-42df-4de7-b2e9-b33f0179ae9d" xlink:to="loc_us-gaap_Investments_0c11973b-d0fb-43b0-8e0c-a33167751fa7" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansScheduleofChangesinProjectedBenefitObligationsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansScheduleofChangesinProjectedBenefitObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansScheduleofChangesinProjectedBenefitObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_396d6858-c6b8-4352-8218-7e4aebf7e5a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c1dd3a67-7768-47f2-8f1a-e42105967394" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_396d6858-c6b8-4352-8218-7e4aebf7e5a8" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c1dd3a67-7768-47f2-8f1a-e42105967394" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_947b1366-9284-475a-9553-165f56178b44" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c1dd3a67-7768-47f2-8f1a-e42105967394" xlink:to="loc_dei_LegalEntityAxis_947b1366-9284-475a-9553-165f56178b44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_947b1366-9284-475a-9553-165f56178b44_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_947b1366-9284-475a-9553-165f56178b44" xlink:to="loc_dei_EntityDomain_947b1366-9284-475a-9553-165f56178b44_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e1c8480e-66bd-4d8e-8b18-e9b756c9e8ae" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_947b1366-9284-475a-9553-165f56178b44" xlink:to="loc_dei_EntityDomain_e1c8480e-66bd-4d8e-8b18-e9b756c9e8ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_3b3725c1-893e-4cbb-b879-f2044a5073cc" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_e1c8480e-66bd-4d8e-8b18-e9b756c9e8ae" xlink:to="loc_aal_AmericanAirlinesIncMember_3b3725c1-893e-4cbb-b879-f2044a5073cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_22b7f0a6-d0db-4168-a9b1-e209a6796bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c1dd3a67-7768-47f2-8f1a-e42105967394" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_22b7f0a6-d0db-4168-a9b1-e209a6796bd8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_22b7f0a6-d0db-4168-a9b1-e209a6796bd8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_22b7f0a6-d0db-4168-a9b1-e209a6796bd8" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_22b7f0a6-d0db-4168-a9b1-e209a6796bd8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_1ce183d6-6aa5-4762-af7e-8424f44d4c19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_22b7f0a6-d0db-4168-a9b1-e209a6796bd8" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_1ce183d6-6aa5-4762-af7e-8424f44d4c19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_991821e9-d7b1-4c1c-89dc-8dab741bf7cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_1ce183d6-6aa5-4762-af7e-8424f44d4c19" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_991821e9-d7b1-4c1c-89dc-8dab741bf7cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_e5c76de8-c5a7-4212-bd30-6ab236bec05a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_1ce183d6-6aa5-4762-af7e-8424f44d4c19" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_e5c76de8-c5a7-4212-bd30-6ab236bec05a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_6b18712c-3de5-4610-8084-13c81c06705d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_396d6858-c6b8-4352-8218-7e4aebf7e5a8" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_6b18712c-3de5-4610-8084-13c81c06705d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_092b7793-022b-47dc-8b80-1274e056c33a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_6b18712c-3de5-4610-8084-13c81c06705d" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_092b7793-022b-47dc-8b80-1274e056c33a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_94b71d6b-e55b-4a48-a37a-b23d7c391888" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_6b18712c-3de5-4610-8084-13c81c06705d" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_94b71d6b-e55b-4a48-a37a-b23d7c391888" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_229a58ab-8c10-4d5f-afd5-3557cff0208a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_6b18712c-3de5-4610-8084-13c81c06705d" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_229a58ab-8c10-4d5f-afd5-3557cff0208a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_77c2d32d-689b-48f4-957a-79e62279a13a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_6b18712c-3de5-4610-8084-13c81c06705d" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_77c2d32d-689b-48f4-957a-79e62279a13a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAmendments_3798bee9-40a0-4614-9a66-8fcfe5a087ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanPlanAmendments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_6b18712c-3de5-4610-8084-13c81c06705d" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAmendments_3798bee9-40a0-4614-9a66-8fcfe5a087ba" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_fd4121f7-ed08-4574-b896-4b85b44db930" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_6b18712c-3de5-4610-8084-13c81c06705d" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_fd4121f7-ed08-4574-b896-4b85b44db930" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanOtherChanges_89011437-dfe0-466a-bf48-2102a9a4069d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanOtherChanges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_6b18712c-3de5-4610-8084-13c81c06705d" xlink:to="loc_us-gaap_DefinedBenefitPlanOtherChanges_89011437-dfe0-466a-bf48-2102a9a4069d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_875398f4-9dfd-4883-b3f7-fc2a5788e837" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansScheduleofChangesinFairValueofPlanAssetsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansScheduleofChangesinFairValueofPlanAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansScheduleofChangesinFairValueofPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_91bd9f85-79c4-4c38-a6f7-48ae565be00f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_493fb32e-8af9-4d20-a120-7cc363a3c1c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_91bd9f85-79c4-4c38-a6f7-48ae565be00f" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_493fb32e-8af9-4d20-a120-7cc363a3c1c7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_09f4be2d-cadb-43ba-9d45-43ad800f68d4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_493fb32e-8af9-4d20-a120-7cc363a3c1c7" xlink:to="loc_dei_LegalEntityAxis_09f4be2d-cadb-43ba-9d45-43ad800f68d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_09f4be2d-cadb-43ba-9d45-43ad800f68d4_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_09f4be2d-cadb-43ba-9d45-43ad800f68d4" xlink:to="loc_dei_EntityDomain_09f4be2d-cadb-43ba-9d45-43ad800f68d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_4c19c5cc-f4a6-4060-86cf-7595e0b38513" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_09f4be2d-cadb-43ba-9d45-43ad800f68d4" xlink:to="loc_dei_EntityDomain_4c19c5cc-f4a6-4060-86cf-7595e0b38513" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_4a42d096-9d92-4b3e-a7c8-5211f3127f18" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4c19c5cc-f4a6-4060-86cf-7595e0b38513" xlink:to="loc_aal_AmericanAirlinesIncMember_4a42d096-9d92-4b3e-a7c8-5211f3127f18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_e4747676-35b7-4a7f-b997-29f37b523cd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_493fb32e-8af9-4d20-a120-7cc363a3c1c7" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_e4747676-35b7-4a7f-b997-29f37b523cd4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_e4747676-35b7-4a7f-b997-29f37b523cd4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_e4747676-35b7-4a7f-b997-29f37b523cd4" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_e4747676-35b7-4a7f-b997-29f37b523cd4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_6b82a95a-750a-4436-aabe-f6912726bc6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_e4747676-35b7-4a7f-b997-29f37b523cd4" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_6b82a95a-750a-4436-aabe-f6912726bc6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_95469abd-5170-462e-b5db-95ad25afc140" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_6b82a95a-750a-4436-aabe-f6912726bc6c" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_95469abd-5170-462e-b5db-95ad25afc140" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_8a6cbf72-4654-4c3d-b3df-3dd8d430186b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_6b82a95a-750a-4436-aabe-f6912726bc6c" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_8a6cbf72-4654-4c3d-b3df-3dd8d430186b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_4bc26372-622b-4b79-8324-ebc6babdea34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_91bd9f85-79c4-4c38-a6f7-48ae565be00f" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_4bc26372-622b-4b79-8324-ebc6babdea34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_a3181454-5318-420f-818a-3ca88340ae39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_4bc26372-622b-4b79-8324-ebc6babdea34" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_a3181454-5318-420f-818a-3ca88340ae39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_ca528a1b-672b-496b-810c-a3204d93d50e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_4bc26372-622b-4b79-8324-ebc6babdea34" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_ca528a1b-672b-496b-810c-a3204d93d50e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_2f316e6c-0190-4176-8476-47633b57aa7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_4bc26372-622b-4b79-8324-ebc6babdea34" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_2f316e6c-0190-4176-8476-47633b57aa7b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_19251a93-95bb-4a71-911e-8badfd1941e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_4bc26372-622b-4b79-8324-ebc6babdea34" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_19251a93-95bb-4a71-911e-8badfd1941e4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DefinedBenefitPlanPlanAssetsIncreaseDecreaseOther_d881e080-3212-44d6-86a3-fb7faae42afa" xlink:href="aal-20251231.xsd#aal_DefinedBenefitPlanPlanAssetsIncreaseDecreaseOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_4bc26372-622b-4b79-8324-ebc6babdea34" xlink:to="loc_aal_DefinedBenefitPlanPlanAssetsIncreaseDecreaseOther_d881e080-3212-44d6-86a3-fb7faae42afa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_f81246ff-347b-4b58-9ecf-1da088d74362" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_f9be16c5-c9fc-4dea-8f94-e4629b465880" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_4bc26372-622b-4b79-8324-ebc6babdea34" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_f9be16c5-c9fc-4dea-8f94-e4629b465880" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DefinedBenefitPlanPlanAssetsRequiredContributionsByEmployer_cf0280f6-d666-44d1-8bd9-bff6ab640a04" xlink:href="aal-20251231.xsd#aal_DefinedBenefitPlanPlanAssetsRequiredContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_91bd9f85-79c4-4c38-a6f7-48ae565be00f" xlink:to="loc_aal_DefinedBenefitPlanPlanAssetsRequiredContributionsByEmployer_cf0280f6-d666-44d1-8bd9-bff6ab640a04" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansScheduleofAmountsRecognizedinConsolidatedBalanceSheetsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansScheduleofAmountsRecognizedinConsolidatedBalanceSheetsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansScheduleofAmountsRecognizedinConsolidatedBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b4c7d2a6-6e7b-432e-8fd3-616cfb22aa09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e262babe-59ab-420b-9704-2d98ec17acb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b4c7d2a6-6e7b-432e-8fd3-616cfb22aa09" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e262babe-59ab-420b-9704-2d98ec17acb2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_b6c81645-827f-4db1-a46c-4e8068211dc5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e262babe-59ab-420b-9704-2d98ec17acb2" xlink:to="loc_dei_LegalEntityAxis_b6c81645-827f-4db1-a46c-4e8068211dc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b6c81645-827f-4db1-a46c-4e8068211dc5_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_b6c81645-827f-4db1-a46c-4e8068211dc5" xlink:to="loc_dei_EntityDomain_b6c81645-827f-4db1-a46c-4e8068211dc5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_13c42900-9192-4efa-9b7d-b085c8eff50d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_b6c81645-827f-4db1-a46c-4e8068211dc5" xlink:to="loc_dei_EntityDomain_13c42900-9192-4efa-9b7d-b085c8eff50d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_103698b4-3dab-4406-ac40-ec0d03fa3baf" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_13c42900-9192-4efa-9b7d-b085c8eff50d" xlink:to="loc_aal_AmericanAirlinesIncMember_103698b4-3dab-4406-ac40-ec0d03fa3baf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_5617dc8a-510c-4a0a-ba84-573b9a6340d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e262babe-59ab-420b-9704-2d98ec17acb2" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_5617dc8a-510c-4a0a-ba84-573b9a6340d6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_5617dc8a-510c-4a0a-ba84-573b9a6340d6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_5617dc8a-510c-4a0a-ba84-573b9a6340d6" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_5617dc8a-510c-4a0a-ba84-573b9a6340d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_4a834f5f-010e-49b8-9861-954bfdc083e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_5617dc8a-510c-4a0a-ba84-573b9a6340d6" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_4a834f5f-010e-49b8-9861-954bfdc083e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_00cc8a3f-7142-463f-8b45-02593db3ce11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_4a834f5f-010e-49b8-9861-954bfdc083e9" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_00cc8a3f-7142-463f-8b45-02593db3ce11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_d22a552c-cf77-43b8-b9fe-b8e1eacaeaf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_4a834f5f-010e-49b8-9861-954bfdc083e9" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_d22a552c-cf77-43b8-b9fe-b8e1eacaeaf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_fd747c7d-68f1-4441-8d12-32e5188e877d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b4c7d2a6-6e7b-432e-8fd3-616cfb22aa09" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_fd747c7d-68f1-4441-8d12-32e5188e877d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_b87bf8cf-a14e-44be-8a06-3b525fd8c955" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b4c7d2a6-6e7b-432e-8fd3-616cfb22aa09" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_b87bf8cf-a14e-44be-8a06-3b525fd8c955" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent_a64942eb-5f7d-4f1b-b156-1f08548bea4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b4c7d2a6-6e7b-432e-8fd3-616cfb22aa09" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent_a64942eb-5f7d-4f1b-b156-1f08548bea4f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansScheduleofAmountsRecognizedinOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansScheduleofAmountsRecognizedinOtherComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansScheduleofAmountsRecognizedinOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_547cd42a-9355-41ce-afcc-1de4e24399ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_47af1e15-d825-4c66-84b7-2572f2fff4b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_547cd42a-9355-41ce-afcc-1de4e24399ea" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_47af1e15-d825-4c66-84b7-2572f2fff4b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_e4b331c7-3789-42eb-971e-c1835827ede2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_47af1e15-d825-4c66-84b7-2572f2fff4b4" xlink:to="loc_dei_LegalEntityAxis_e4b331c7-3789-42eb-971e-c1835827ede2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e4b331c7-3789-42eb-971e-c1835827ede2_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_e4b331c7-3789-42eb-971e-c1835827ede2" xlink:to="loc_dei_EntityDomain_e4b331c7-3789-42eb-971e-c1835827ede2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_c69fa5b5-5632-47fd-b083-37774fcb3132" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_e4b331c7-3789-42eb-971e-c1835827ede2" xlink:to="loc_dei_EntityDomain_c69fa5b5-5632-47fd-b083-37774fcb3132" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_839c5def-a9c8-4d4e-bed9-e817a9f4242e" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_c69fa5b5-5632-47fd-b083-37774fcb3132" xlink:to="loc_aal_AmericanAirlinesIncMember_839c5def-a9c8-4d4e-bed9-e817a9f4242e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_bc3ac760-954a-481c-b4ca-e51315de3a94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_47af1e15-d825-4c66-84b7-2572f2fff4b4" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_bc3ac760-954a-481c-b4ca-e51315de3a94" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_bc3ac760-954a-481c-b4ca-e51315de3a94_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_bc3ac760-954a-481c-b4ca-e51315de3a94" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_bc3ac760-954a-481c-b4ca-e51315de3a94_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_c86042a3-e6bb-446f-bd13-5008da2e553f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_bc3ac760-954a-481c-b4ca-e51315de3a94" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_c86042a3-e6bb-446f-bd13-5008da2e553f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_a93ba1ee-6ccb-4d5e-91d1-c464fd007264" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_c86042a3-e6bb-446f-bd13-5008da2e553f" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_a93ba1ee-6ccb-4d5e-91d1-c464fd007264" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_20581c04-7cf9-4f14-8385-b9e8789e6470" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_c86042a3-e6bb-446f-bd13-5008da2e553f" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_20581c04-7cf9-4f14-8385-b9e8789e6470" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_b1e29e04-d97b-41ac-8ff2-d5cfaf5acafc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_547cd42a-9355-41ce-afcc-1de4e24399ea" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_b1e29e04-d97b-41ac-8ff2-d5cfaf5acafc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_aa13dd94-1fe7-4cc7-807c-6fbb6932e2b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_547cd42a-9355-41ce-afcc-1de4e24399ea" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_aa13dd94-1fe7-4cc7-807c-6fbb6932e2b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_ecaf5724-85e2-493e-ae5a-8c62ee36165b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_547cd42a-9355-41ce-afcc-1de4e24399ea" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_ecaf5724-85e2-493e-ae5a-8c62ee36165b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansScheduleofAccumulatedBenefitObligationsExceedingFairValueofPlanAssetsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansScheduleofAccumulatedBenefitObligationsExceedingFairValueofPlanAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansScheduleofAccumulatedBenefitObligationsExceedingFairValueofPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_890c6b90-81df-4a3e-8abd-125062f882e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_a5c44893-359c-415e-aeb6-fed56cdbf4e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_890c6b90-81df-4a3e-8abd-125062f882e7" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_a5c44893-359c-415e-aeb6-fed56cdbf4e0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_2b91ef74-8626-4f6b-ae40-8886e3dead7b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_a5c44893-359c-415e-aeb6-fed56cdbf4e0" xlink:to="loc_dei_LegalEntityAxis_2b91ef74-8626-4f6b-ae40-8886e3dead7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_2b91ef74-8626-4f6b-ae40-8886e3dead7b_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_2b91ef74-8626-4f6b-ae40-8886e3dead7b" xlink:to="loc_dei_EntityDomain_2b91ef74-8626-4f6b-ae40-8886e3dead7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_442623ff-04ed-4a3b-acb6-3110c93c6cd7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_2b91ef74-8626-4f6b-ae40-8886e3dead7b" xlink:to="loc_dei_EntityDomain_442623ff-04ed-4a3b-acb6-3110c93c6cd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_27acb42c-58f5-4b39-8956-380d3c5a5e0e" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_442623ff-04ed-4a3b-acb6-3110c93c6cd7" xlink:to="loc_aal_AmericanAirlinesIncMember_27acb42c-58f5-4b39-8956-380d3c5a5e0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_f68fd083-a7af-4528-9e97-909ffa41975b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_a5c44893-359c-415e-aeb6-fed56cdbf4e0" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_f68fd083-a7af-4528-9e97-909ffa41975b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_f68fd083-a7af-4528-9e97-909ffa41975b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_f68fd083-a7af-4528-9e97-909ffa41975b" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_f68fd083-a7af-4528-9e97-909ffa41975b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_dbb966e5-661c-4726-a292-1a7d1d352292" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_f68fd083-a7af-4528-9e97-909ffa41975b" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_dbb966e5-661c-4726-a292-1a7d1d352292" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_35cfef34-21ee-496d-ab36-a39394d8dc25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_dbb966e5-661c-4726-a292-1a7d1d352292" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_35cfef34-21ee-496d-ab36-a39394d8dc25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_60d4305d-d417-4091-829f-8662d774a034" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_dbb966e5-661c-4726-a292-1a7d1d352292" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_60d4305d-d417-4091-829f-8662d774a034" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_7fce65e7-810b-4934-94d8-fbce66bbf87d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_890c6b90-81df-4a3e-8abd-125062f882e7" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_7fce65e7-810b-4934-94d8-fbce66bbf87d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_3b719983-dc2b-4a03-8cfe-be6f83afe09e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_890c6b90-81df-4a3e-8abd-125062f882e7" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_3b719983-dc2b-4a03-8cfe-be6f83afe09e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_8f206b37-04b3-4878-8253-9e41d43f2b41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_890c6b90-81df-4a3e-8abd-125062f882e7" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_8f206b37-04b3-4878-8253-9e41d43f2b41" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_f46571fe-fc42-4c5d-9f79-04e224c6b47f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_890c6b90-81df-4a3e-8abd-125062f882e7" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_f46571fe-fc42-4c5d-9f79-04e224c6b47f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansComponentsofNetPeriodicBenefitCostIncomeDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansComponentsofNetPeriodicBenefitCostIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansComponentsofNetPeriodicBenefitCostIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_3f8d9579-26a9-45b9-8190-7902c4424562" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_4d9e41d6-8635-4e4c-8e3e-cd1b90ef77ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_3f8d9579-26a9-45b9-8190-7902c4424562" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_4d9e41d6-8635-4e4c-8e3e-cd1b90ef77ae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_604fb5aa-ae5f-4e4c-9459-db27e0ef19d5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_4d9e41d6-8635-4e4c-8e3e-cd1b90ef77ae" xlink:to="loc_dei_LegalEntityAxis_604fb5aa-ae5f-4e4c-9459-db27e0ef19d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_604fb5aa-ae5f-4e4c-9459-db27e0ef19d5_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_604fb5aa-ae5f-4e4c-9459-db27e0ef19d5" xlink:to="loc_dei_EntityDomain_604fb5aa-ae5f-4e4c-9459-db27e0ef19d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b7e8ddc1-b8b3-4030-8a31-8ae50e7741b1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_604fb5aa-ae5f-4e4c-9459-db27e0ef19d5" xlink:to="loc_dei_EntityDomain_b7e8ddc1-b8b3-4030-8a31-8ae50e7741b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_7338d580-89e9-466f-8caf-60fabf7f2164" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_b7e8ddc1-b8b3-4030-8a31-8ae50e7741b1" xlink:to="loc_aal_AmericanAirlinesIncMember_7338d580-89e9-466f-8caf-60fabf7f2164" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_63900872-9c78-4d6d-ad26-b98bff7ee616" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_4d9e41d6-8635-4e4c-8e3e-cd1b90ef77ae" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_63900872-9c78-4d6d-ad26-b98bff7ee616" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_63900872-9c78-4d6d-ad26-b98bff7ee616_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_63900872-9c78-4d6d-ad26-b98bff7ee616" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_63900872-9c78-4d6d-ad26-b98bff7ee616_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_67380853-539d-4430-aac3-24819e167c7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_63900872-9c78-4d6d-ad26-b98bff7ee616" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_67380853-539d-4430-aac3-24819e167c7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_8e5f3b4a-c5fb-4c52-92c2-20bfafbe1534" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_67380853-539d-4430-aac3-24819e167c7d" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_8e5f3b4a-c5fb-4c52-92c2-20bfafbe1534" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_683eaa73-f25c-446d-9123-6f7080fce9f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_67380853-539d-4430-aac3-24819e167c7d" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_683eaa73-f25c-446d-9123-6f7080fce9f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_293e2b2a-77f0-4a70-87c3-b2c850a515ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_3f8d9579-26a9-45b9-8190-7902c4424562" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_293e2b2a-77f0-4a70-87c3-b2c850a515ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_5ff2b5ef-c63b-4836-b4b5-84fcedec973a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_293e2b2a-77f0-4a70-87c3-b2c850a515ca" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_5ff2b5ef-c63b-4836-b4b5-84fcedec973a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_0961d4fa-e8bf-403f-9650-6f56ad8ba135" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_293e2b2a-77f0-4a70-87c3-b2c850a515ca" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_0961d4fa-e8bf-403f-9650-6f56ad8ba135" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_5974569e-1590-46a1-a41d-4eab154a6fcc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_293e2b2a-77f0-4a70-87c3-b2c850a515ca" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_5974569e-1590-46a1-a41d-4eab154a6fcc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAmountsAbstract_88ac5181-1af8-4305-8a89-cb7e4cd21095" xlink:href="aal-20251231.xsd#aal_DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAmountsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_293e2b2a-77f0-4a70-87c3-b2c850a515ca" xlink:to="loc_aal_DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAmountsAbstract_88ac5181-1af8-4305-8a89-cb7e4cd21095" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_eb53bcb0-16fb-45b2-8266-2cf0d9c763b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAmountsAbstract_88ac5181-1af8-4305-8a89-cb7e4cd21095" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_eb53bcb0-16fb-45b2-8266-2cf0d9c763b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_7fb05aa4-75a2-41f3-9090-9084c9652290" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationAmountsAbstract_88ac5181-1af8-4305-8a89-cb7e4cd21095" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_7fb05aa4-75a2-41f3-9090-9084c9652290" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_467a5fd3-6ec5-4dad-8033-9fc4d26c802e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_293e2b2a-77f0-4a70-87c3-b2c850a515ca" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_467a5fd3-6ec5-4dad-8033-9fc4d26c802e" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansScheduleofAssumptionUsedtoDetermineBenefitObligationsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansScheduleofAssumptionUsedtoDetermineBenefitObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansScheduleofAssumptionUsedtoDetermineBenefitObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6d8d07e0-dda0-4af8-928f-d852ac4a6e49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ce2caef2-a27e-4ff6-a29f-bb6788599fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6d8d07e0-dda0-4af8-928f-d852ac4a6e49" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ce2caef2-a27e-4ff6-a29f-bb6788599fc2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_7ce95a49-dc99-4907-9602-9930f12974af" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ce2caef2-a27e-4ff6-a29f-bb6788599fc2" xlink:to="loc_dei_LegalEntityAxis_7ce95a49-dc99-4907-9602-9930f12974af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_7ce95a49-dc99-4907-9602-9930f12974af_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_7ce95a49-dc99-4907-9602-9930f12974af" xlink:to="loc_dei_EntityDomain_7ce95a49-dc99-4907-9602-9930f12974af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_f35499fb-0410-4ead-96fa-3e21a411809e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_7ce95a49-dc99-4907-9602-9930f12974af" xlink:to="loc_dei_EntityDomain_f35499fb-0410-4ead-96fa-3e21a411809e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_ca67077b-3199-4bc0-9efb-99645366594b" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_f35499fb-0410-4ead-96fa-3e21a411809e" xlink:to="loc_aal_AmericanAirlinesIncMember_ca67077b-3199-4bc0-9efb-99645366594b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_cee94422-0eb8-4b04-a17a-ad7d4412c7fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ce2caef2-a27e-4ff6-a29f-bb6788599fc2" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_cee94422-0eb8-4b04-a17a-ad7d4412c7fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_cee94422-0eb8-4b04-a17a-ad7d4412c7fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_cee94422-0eb8-4b04-a17a-ad7d4412c7fe" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_cee94422-0eb8-4b04-a17a-ad7d4412c7fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_66d55b36-966d-4167-83e8-dde8751e85a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_cee94422-0eb8-4b04-a17a-ad7d4412c7fe" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_66d55b36-966d-4167-83e8-dde8751e85a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_607ac149-b758-43bf-9d11-133a23a06a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_66d55b36-966d-4167-83e8-dde8751e85a5" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_607ac149-b758-43bf-9d11-133a23a06a2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_bf69bb6a-2a6f-42de-b4b9-13b992281a18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_66d55b36-966d-4167-83e8-dde8751e85a5" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_bf69bb6a-2a6f-42de-b4b9-13b992281a18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_2c71d1ae-54be-4764-9c63-b9c13dd2ae36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6d8d07e0-dda0-4af8-928f-d852ac4a6e49" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_2c71d1ae-54be-4764-9c63-b9c13dd2ae36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_f23da8ac-9182-47a9-8259-91a06b54a039" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_2c71d1ae-54be-4764-9c63-b9c13dd2ae36" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_f23da8ac-9182-47a9-8259-91a06b54a039" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_a906d8e6-6f59-4eb8-bb70-7c3e0e8edf0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6d8d07e0-dda0-4af8-928f-d852ac4a6e49" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_a906d8e6-6f59-4eb8-bb70-7c3e0e8edf0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_5d4d2bc7-5d75-4094-b294-bffd45bea20e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_a906d8e6-6f59-4eb8-bb70-7c3e0e8edf0f" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_5d4d2bc7-5d75-4094-b294-bffd45bea20e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_5ba8453a-ead3-4f3f-9b2b-68af780ffd28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_a906d8e6-6f59-4eb8-bb70-7c3e0e8edf0f" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_5ba8453a-ead3-4f3f-9b2b-68af780ffd28" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear_465afc29-4ab3-4fe5-90e4-6d09c1995890" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_a906d8e6-6f59-4eb8-bb70-7c3e0e8edf0f" xlink:to="loc_us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear_465afc29-4ab3-4fe5-90e4-6d09c1995890" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1_5b72e2b9-2a84-4ac9-887f-3d329a5e69d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_a906d8e6-6f59-4eb8-bb70-7c3e0e8edf0f" xlink:to="loc_us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1_5b72e2b9-2a84-4ac9-887f-3d329a5e69d2" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansAdditionalInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e4d03348-24c0-4b59-ac13-bce75f06d908" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e4d03348-24c0-4b59-ac13-bce75f06d908" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_039b5652-7303-4ef6-8d99-853eb95603d5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e4d03348-24c0-4b59-ac13-bce75f06d908" xlink:to="loc_dei_LegalEntityAxis_039b5652-7303-4ef6-8d99-853eb95603d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_039b5652-7303-4ef6-8d99-853eb95603d5_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_039b5652-7303-4ef6-8d99-853eb95603d5" xlink:to="loc_dei_EntityDomain_039b5652-7303-4ef6-8d99-853eb95603d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3250db92-9f75-42cd-bd9d-06b06f02758c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_039b5652-7303-4ef6-8d99-853eb95603d5" xlink:to="loc_dei_EntityDomain_3250db92-9f75-42cd-bd9d-06b06f02758c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_ae38ceaa-8a3c-415d-b91c-a114b017edef" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_3250db92-9f75-42cd-bd9d-06b06f02758c" xlink:to="loc_aal_AmericanAirlinesIncMember_ae38ceaa-8a3c-415d-b91c-a114b017edef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameAxis_3c4bc79d-0943-4305-a38a-f0caf1c0f25f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e4d03348-24c0-4b59-ac13-bce75f06d908" xlink:to="loc_us-gaap_RetirementPlanNameAxis_3c4bc79d-0943-4305-a38a-f0caf1c0f25f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_3c4bc79d-0943-4305-a38a-f0caf1c0f25f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanNameAxis_3c4bc79d-0943-4305-a38a-f0caf1c0f25f" xlink:to="loc_us-gaap_RetirementPlanNameDomain_3c4bc79d-0943-4305-a38a-f0caf1c0f25f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_90a3b072-14f1-45ff-98d7-14a4928bc692" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanNameAxis_3c4bc79d-0943-4305-a38a-f0caf1c0f25f" xlink:to="loc_us-gaap_RetirementPlanNameDomain_90a3b072-14f1-45ff-98d7-14a4928bc692" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_InternationalAssociationOfMachinistsAndAerospaceWorkersNationalPensionFundMember_6d302589-579d-42ec-a9b6-2ae459570bcf" xlink:href="aal-20251231.xsd#aal_InternationalAssociationOfMachinistsAndAerospaceWorkersNationalPensionFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_90a3b072-14f1-45ff-98d7-14a4928bc692" xlink:to="loc_aal_InternationalAssociationOfMachinistsAndAerospaceWorkersNationalPensionFundMember_6d302589-579d-42ec-a9b6-2ae459570bcf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_0733e3c6-750f-49d5-bd17-b0e876d7749b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e4d03348-24c0-4b59-ac13-bce75f06d908" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_0733e3c6-750f-49d5-bd17-b0e876d7749b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_0733e3c6-750f-49d5-bd17-b0e876d7749b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_0733e3c6-750f-49d5-bd17-b0e876d7749b" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_0733e3c6-750f-49d5-bd17-b0e876d7749b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_513a6f74-e169-4d78-a256-509b4eb0aa08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_0733e3c6-750f-49d5-bd17-b0e876d7749b" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_513a6f74-e169-4d78-a256-509b4eb0aa08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_fb792b5c-90c6-4f9a-a31e-a1d43a89c4db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_513a6f74-e169-4d78-a256-509b4eb0aa08" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_fb792b5c-90c6-4f9a-a31e-a1d43a89c4db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_be474aab-292c-4dbc-9966-b829069a7d59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e4d03348-24c0-4b59-ac13-bce75f06d908" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_be474aab-292c-4dbc-9966-b829069a7d59" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_be474aab-292c-4dbc-9966-b829069a7d59_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_be474aab-292c-4dbc-9966-b829069a7d59" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_be474aab-292c-4dbc-9966-b829069a7d59_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_07afa4fb-da10-4850-aa25-e5b1e88a619b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_be474aab-292c-4dbc-9966-b829069a7d59" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_07afa4fb-da10-4850-aa25-e5b1e88a619b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_e5d08aec-fbe8-4da4-8bc3-67c10d14e691" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_07afa4fb-da10-4850-aa25-e5b1e88a619b" xlink:to="loc_us-gaap_SubsequentEventMember_e5d08aec-fbe8-4da4-8bc3-67c10d14e691" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_019c2eba-97ed-7630-8bf6-dc2e12ec4610" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e4d03348-24c0-4b59-ac13-bce75f06d908" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_019c2eba-97ed-7630-8bf6-dc2e12ec4610" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_019c2eba-97ed-7630-8bf6-dc2e12ec4610_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_019c2eba-97ed-7630-8bf6-dc2e12ec4610" xlink:to="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_019c2eba-97ed-7630-8bf6-dc2e12ec4610_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_019c2eba-97ed-7814-864e-0c70824b33e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_019c2eba-97ed-7630-8bf6-dc2e12ec4610" xlink:to="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_019c2eba-97ed-7814-864e-0c70824b33e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredProfitSharingMember_019c2eba-97ed-7675-9a22-e40d0e12774d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredProfitSharingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_019c2eba-97ed-7814-864e-0c70824b33e9" xlink:to="loc_us-gaap_DeferredProfitSharingMember_019c2eba-97ed-7675-9a22-e40d0e12774d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_b26ffd52-f529-4430-aad4-065fb180c319" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_b26ffd52-f529-4430-aad4-065fb180c319" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DefinedBenefitPlanAssumptionsUsedForExpectedLongTermRateOfReturnOnPlanAssetsActualReturnsAchievedTerm_e2fafcbf-93a3-4453-a073-6350d112363f" xlink:href="aal-20251231.xsd#aal_DefinedBenefitPlanAssumptionsUsedForExpectedLongTermRateOfReturnOnPlanAssetsActualReturnsAchievedTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_aal_DefinedBenefitPlanAssumptionsUsedForExpectedLongTermRateOfReturnOnPlanAssetsActualReturnsAchievedTerm_e2fafcbf-93a3-4453-a073-6350d112363f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_f4af788a-7ecd-4a1e-94c8-5f1fcea132ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_f4af788a-7ecd-4a1e-94c8-5f1fcea132ef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DefinedBenefitPlanPlanAssetsRequiredContributionsByEmployer_019c2a7e-720f-7866-ac87-6298188db7c9" xlink:href="aal-20251231.xsd#aal_DefinedBenefitPlanPlanAssetsRequiredContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_aal_DefinedBenefitPlanPlanAssetsRequiredContributionsByEmployer_019c2a7e-720f-7866-ac87-6298188db7c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DefinedBenefitPlanPlanAssetsSupplementalContributionsByEmployer_019c2a80-74e3-7f01-8689-7fabe81c5075" xlink:href="aal-20251231.xsd#aal_DefinedBenefitPlanPlanAssetsSupplementalContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_aal_DefinedBenefitPlanPlanAssetsSupplementalContributionsByEmployer_019c2a80-74e3-7f01-8689-7fabe81c5075" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriod1_93576cfa-3024-4f9e-b0b0-ff57988635fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriod1_93576cfa-3024-4f9e-b0b0-ff57988635fa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments_18af55c8-6c0b-495c-ad3c-5f6b569cc065" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments_18af55c8-6c0b-495c-ad3c-5f6b569cc065" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DefinedBenefitPlanMasterTrustFutureFundingCommitmentsPeriod_eb016046-33ed-46f8-94ec-f516b76c2998" xlink:href="aal-20251231.xsd#aal_DefinedBenefitPlanMasterTrustFutureFundingCommitmentsPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_aal_DefinedBenefitPlanMasterTrustFutureFundingCommitmentsPeriod_eb016046-33ed-46f8-94ec-f516b76c2998" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_79f3d7db-5fd5-4809-9fb9-92255dba93cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedContributionPlanCostRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_79f3d7db-5fd5-4809-9fb9-92255dba93cb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerContributionCost_60e2c56b-224d-4018-9183-0d3425b4e9ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MultiemployerPlanPensionSignificantEmployerContributionCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerContributionCost_60e2c56b-224d-4018-9183-0d3425b4e9ff" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_MultiemployerPlanTotalContributionsAsReportedOnForm5500_019c6e23-a93d-709f-8f5b-f4067fb2ec55" xlink:href="aal-20251231.xsd#aal_MultiemployerPlanTotalContributionsAsReportedOnForm5500"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_aal_MultiemployerPlanTotalContributionsAsReportedOnForm5500_019c6e23-a93d-709f-8f5b-f4067fb2ec55" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_MultiemployerPlanContributionsByEmployerPercentageOfTotalContributions_549adaae-d453-4956-825b-335b710ea2b5" xlink:href="aal-20251231.xsd#aal_MultiemployerPlanContributionsByEmployerPercentageOfTotalContributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_aal_MultiemployerPlanContributionsByEmployerPercentageOfTotalContributions_549adaae-d453-4956-825b-335b710ea2b5" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_MultiemployerPlansFundedStatusPercentage_78e501b1-3f16-4426-8f7e-d429019de10d" xlink:href="aal-20251231.xsd#aal_MultiemployerPlansFundedStatusPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_aal_MultiemployerPlansFundedStatusPercentage_78e501b1-3f16-4426-8f7e-d429019de10d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_MultiemployerPlansFundingImprovementPlanAndRehabilitationPlanAnnualPercentageIncreaseInContributionRateByEmployer_e402dc00-a30c-47ab-8d96-8f31fd19c0b5" xlink:href="aal-20251231.xsd#aal_MultiemployerPlansFundingImprovementPlanAndRehabilitationPlanAnnualPercentageIncreaseInContributionRateByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_aal_MultiemployerPlansFundingImprovementPlanAndRehabilitationPlanAnnualPercentageIncreaseInContributionRateByEmployer_e402dc00-a30c-47ab-8d96-8f31fd19c0b5" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DeferredCompensationCashBasedArrangementsFundedPercentage_019c696b-3711-7746-a4e6-8ab0666098b8" xlink:href="aal-20251231.xsd#aal_DeferredCompensationCashBasedArrangementsFundedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_aal_DeferredCompensationCashBasedArrangementsFundedPercentage_019c696b-3711-7746-a4e6-8ab0666098b8" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DeferredCompensationCashBasedArrangementsFundedAdjustedIncomeLossBeforeTaxMaximum_019c2ea5-ce44-799f-849f-bd85e43b4a75" xlink:href="aal-20251231.xsd#aal_DeferredCompensationCashBasedArrangementsFundedAdjustedIncomeLossBeforeTaxMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_aal_DeferredCompensationCashBasedArrangementsFundedAdjustedIncomeLossBeforeTaxMaximum_019c2ea5-ce44-799f-849f-bd85e43b4a75" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DeferredCompensationCashBasedArrangementsFundedPercentOfIncomeLossAboveThreshold_019c2ea7-599c-7e0f-99ec-ef1a90eb09b9" xlink:href="aal-20251231.xsd#aal_DeferredCompensationCashBasedArrangementsFundedPercentOfIncomeLossAboveThreshold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_aal_DeferredCompensationCashBasedArrangementsFundedPercentOfIncomeLossAboveThreshold_019c2ea7-599c-7e0f-99ec-ef1a90eb09b9" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationCashBasedArrangementsLiabilityCurrent_019c6c7e-7d14-77e8-b78a-236af5b5aadd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredCompensationCashBasedArrangementsLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b3101d5b-4fe8-4222-8456-b80d33415a33" xlink:to="loc_us-gaap_DeferredCompensationCashBasedArrangementsLiabilityCurrent_019c6c7e-7d14-77e8-b78a-236af5b5aadd" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansScheduleofExpectedFutureServiceBenefitPaymentsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansScheduleofExpectedFutureServiceBenefitPaymentsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansScheduleofExpectedFutureServiceBenefitPaymentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b2e976d1-68f9-47f5-8570-13c63e506a9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6906c4d1-558a-42a5-9275-5be5e40b34a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b2e976d1-68f9-47f5-8570-13c63e506a9e" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6906c4d1-558a-42a5-9275-5be5e40b34a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_d5bde0f4-ebf2-4f3d-a675-f47c6aa6c059" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6906c4d1-558a-42a5-9275-5be5e40b34a4" xlink:to="loc_dei_LegalEntityAxis_d5bde0f4-ebf2-4f3d-a675-f47c6aa6c059" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d5bde0f4-ebf2-4f3d-a675-f47c6aa6c059_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_d5bde0f4-ebf2-4f3d-a675-f47c6aa6c059" xlink:to="loc_dei_EntityDomain_d5bde0f4-ebf2-4f3d-a675-f47c6aa6c059_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_36b76b48-4941-4c5a-85cd-85c37cdaf719" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_d5bde0f4-ebf2-4f3d-a675-f47c6aa6c059" xlink:to="loc_dei_EntityDomain_36b76b48-4941-4c5a-85cd-85c37cdaf719" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_af7a4af7-6600-406e-aaf2-41fd93d0c43c" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_36b76b48-4941-4c5a-85cd-85c37cdaf719" xlink:to="loc_aal_AmericanAirlinesIncMember_af7a4af7-6600-406e-aaf2-41fd93d0c43c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_aea7e473-a7f2-4c4d-bf3d-99011be79393" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_6906c4d1-558a-42a5-9275-5be5e40b34a4" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_aea7e473-a7f2-4c4d-bf3d-99011be79393" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_aea7e473-a7f2-4c4d-bf3d-99011be79393_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_aea7e473-a7f2-4c4d-bf3d-99011be79393" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_aea7e473-a7f2-4c4d-bf3d-99011be79393_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_4fdfdee0-461b-46e1-94a9-856cb10c2607" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_aea7e473-a7f2-4c4d-bf3d-99011be79393" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_4fdfdee0-461b-46e1-94a9-856cb10c2607" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_61b523b7-7e12-413f-bd6c-72b63b60bc70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_4fdfdee0-461b-46e1-94a9-856cb10c2607" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_61b523b7-7e12-413f-bd6c-72b63b60bc70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2f8fea14-0a49-44a6-b83f-c14e24ec2c2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_4fdfdee0-461b-46e1-94a9-856cb10c2607" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2f8fea14-0a49-44a6-b83f-c14e24ec2c2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_bbdacbc9-0027-4d22-a7a8-3d9240624deb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b2e976d1-68f9-47f5-8570-13c63e506a9e" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_bbdacbc9-0027-4d22-a7a8-3d9240624deb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_71dfa4cb-dabc-480a-a845-6a0ec4aac8c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b2e976d1-68f9-47f5-8570-13c63e506a9e" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_71dfa4cb-dabc-480a-a845-6a0ec4aac8c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_8cbb1cb3-de38-41f0-856c-09bee4cd26ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b2e976d1-68f9-47f5-8570-13c63e506a9e" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_8cbb1cb3-de38-41f0-856c-09bee4cd26ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_057b8cf6-de8b-44eb-a197-aa6a115f6f09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b2e976d1-68f9-47f5-8570-13c63e506a9e" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_057b8cf6-de8b-44eb-a197-aa6a115f6f09" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_3b4e70dc-ee5c-478c-9726-fae2684f462c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b2e976d1-68f9-47f5-8570-13c63e506a9e" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_3b4e70dc-ee5c-478c-9726-fae2684f462c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_2e9de6f2-3b03-4194-a579-c77ab4c571ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b2e976d1-68f9-47f5-8570-13c63e506a9e" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_2e9de6f2-3b03-4194-a579-c77ab4c571ff" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansScheduleofAllocationofPlanAssetsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansScheduleofAllocationofPlanAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansScheduleofAllocationofPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_43c42e49-84d9-4cab-a5d8-9734edc1070e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_cd7c56b2-7936-4151-8b6e-9736d02d380f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_43c42e49-84d9-4cab-a5d8-9734edc1070e" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_cd7c56b2-7936-4151-8b6e-9736d02d380f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_bf144d28-dd01-4fcd-8ed4-5805cfa440ed" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_cd7c56b2-7936-4151-8b6e-9736d02d380f" xlink:to="loc_dei_LegalEntityAxis_bf144d28-dd01-4fcd-8ed4-5805cfa440ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bf144d28-dd01-4fcd-8ed4-5805cfa440ed_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_bf144d28-dd01-4fcd-8ed4-5805cfa440ed" xlink:to="loc_dei_EntityDomain_bf144d28-dd01-4fcd-8ed4-5805cfa440ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a821be95-1f92-4876-99b7-0aa14bd1712e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_bf144d28-dd01-4fcd-8ed4-5805cfa440ed" xlink:to="loc_dei_EntityDomain_a821be95-1f92-4876-99b7-0aa14bd1712e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_adbe3c1f-44f7-4879-888e-af6c660b9c35" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_a821be95-1f92-4876-99b7-0aa14bd1712e" xlink:to="loc_aal_AmericanAirlinesIncMember_adbe3c1f-44f7-4879-888e-af6c660b9c35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_e0fd56dc-3dc8-41c0-89ed-14fb7d7454d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_cd7c56b2-7936-4151-8b6e-9736d02d380f" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_e0fd56dc-3dc8-41c0-89ed-14fb7d7454d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_e0fd56dc-3dc8-41c0-89ed-14fb7d7454d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_e0fd56dc-3dc8-41c0-89ed-14fb7d7454d2" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_e0fd56dc-3dc8-41c0-89ed-14fb7d7454d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_356b4c02-08b7-4389-b28d-fc589bf9ed78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_e0fd56dc-3dc8-41c0-89ed-14fb7d7454d2" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_356b4c02-08b7-4389-b28d-fc589bf9ed78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_ed3d7f85-1af1-4d7f-8701-14ef0c37418c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_356b4c02-08b7-4389-b28d-fc589bf9ed78" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_ed3d7f85-1af1-4d7f-8701-14ef0c37418c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesUsMember_019c2a82-525d-7fc3-9f0c-1aa96f33019d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_ed3d7f85-1af1-4d7f-8701-14ef0c37418c" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesUsMember_019c2a82-525d-7fc3-9f0c-1aa96f33019d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesNonUsMember_019c2a83-ddf8-77e9-9ec5-943c6e7881fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesNonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_ed3d7f85-1af1-4d7f-8701-14ef0c37418c" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesNonUsMember_019c2a83-ddf8-77e9-9ec5-943c6e7881fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_EmergingMarketsMember_90cc66ce-b5c6-4979-bea9-863311f10b9e" xlink:href="aal-20251231.xsd#aal_EmergingMarketsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_ed3d7f85-1af1-4d7f-8701-14ef0c37418c" xlink:to="loc_aal_EmergingMarketsMember_90cc66ce-b5c6-4979-bea9-863311f10b9e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivateEquityFundsMember_e8234fca-2faa-406e-be18-ca6c0d5ea178" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrivateEquityFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_ed3d7f85-1af1-4d7f-8701-14ef0c37418c" xlink:to="loc_us-gaap_PrivateEquityFundsMember_e8234fca-2faa-406e-be18-ca6c0d5ea178" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDebtSecurityMember_6108abd1-7bcf-49bf-bdd3-29e26b837549" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDebtSecurityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_356b4c02-08b7-4389-b28d-fc589bf9ed78" xlink:to="loc_us-gaap_DefinedBenefitPlanDebtSecurityMember_6108abd1-7bcf-49bf-bdd3-29e26b837549" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_07b4bc1b-d313-482e-b8d9-5142168028db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_356b4c02-08b7-4389-b28d-fc589bf9ed78" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_07b4bc1b-d313-482e-b8d9-5142168028db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PrivateFixedIncomeMember_c2e7edb6-b5eb-438c-b1a2-cd9627d95198" xlink:href="aal-20251231.xsd#aal_PrivateFixedIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_356b4c02-08b7-4389-b28d-fc589bf9ed78" xlink:to="loc_aal_PrivateFixedIncomeMember_c2e7edb6-b5eb-438c-b1a2-cd9627d95198" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DefinedBenefitPlanOtherInvestmentMember_18d9c713-a6ad-4e60-a644-ab65b318656a" xlink:href="aal-20251231.xsd#aal_DefinedBenefitPlanOtherInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_356b4c02-08b7-4389-b28d-fc589bf9ed78" xlink:to="loc_aal_DefinedBenefitPlanOtherInvestmentMember_18d9c713-a6ad-4e60-a644-ab65b318656a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_25ea49fb-5997-47df-a7a6-2bbf20bf1941" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_356b4c02-08b7-4389-b28d-fc589bf9ed78" xlink:to="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_25ea49fb-5997-47df-a7a6-2bbf20bf1941" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_7c353166-b293-4f06-bec4-39a17cd88d7e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_cd7c56b2-7936-4151-8b6e-9736d02d380f" xlink:to="loc_srt_RangeAxis_7c353166-b293-4f06-bec4-39a17cd88d7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_7c353166-b293-4f06-bec4-39a17cd88d7e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_7c353166-b293-4f06-bec4-39a17cd88d7e" xlink:to="loc_srt_RangeMember_7c353166-b293-4f06-bec4-39a17cd88d7e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_926d16fb-3783-485b-bb38-459bf150be5e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_7c353166-b293-4f06-bec4-39a17cd88d7e" xlink:to="loc_srt_RangeMember_926d16fb-3783-485b-bb38-459bf150be5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_aee0f8fe-c4ea-45ae-9f84-f315f1c823f9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_926d16fb-3783-485b-bb38-459bf150be5e" xlink:to="loc_srt_MinimumMember_aee0f8fe-c4ea-45ae-9f84-f315f1c823f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_63938ffc-16ec-42c8-9257-baa7b72f8573" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_926d16fb-3783-485b-bb38-459bf150be5e" xlink:to="loc_srt_MaximumMember_63938ffc-16ec-42c8-9257-baa7b72f8573" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_4a5e9cfc-a5bf-4970-80d8-0ea70965b44c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_43c42e49-84d9-4cab-a5d8-9734edc1070e" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_4a5e9cfc-a5bf-4970-80d8-0ea70965b44c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansScheduleofFairValueofPensionPlanAssetsbyAssetCategoryDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansScheduleofFairValueofPensionPlanAssetsbyAssetCategoryDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansScheduleofFairValueofPensionPlanAssetsbyAssetCategoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_30beb904-a946-45a5-8396-37d4a2d8d3c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_07e8e1ba-194c-41b9-89da-d9c60471f6e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_30beb904-a946-45a5-8396-37d4a2d8d3c9" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_07e8e1ba-194c-41b9-89da-d9c60471f6e0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_aede1a01-caa5-487d-926d-83c5e4027841" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_07e8e1ba-194c-41b9-89da-d9c60471f6e0" xlink:to="loc_dei_LegalEntityAxis_aede1a01-caa5-487d-926d-83c5e4027841" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_aede1a01-caa5-487d-926d-83c5e4027841_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_aede1a01-caa5-487d-926d-83c5e4027841" xlink:to="loc_dei_EntityDomain_aede1a01-caa5-487d-926d-83c5e4027841_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_536214c7-f375-4886-90fa-38993036dd09" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_aede1a01-caa5-487d-926d-83c5e4027841" xlink:to="loc_dei_EntityDomain_536214c7-f375-4886-90fa-38993036dd09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_0626e557-97c5-4d6a-9900-8f2266a3be5f" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_536214c7-f375-4886-90fa-38993036dd09" xlink:to="loc_aal_AmericanAirlinesIncMember_0626e557-97c5-4d6a-9900-8f2266a3be5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_83cfeeac-7b4c-4bcb-b6e2-389fb7f4fd56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_07e8e1ba-194c-41b9-89da-d9c60471f6e0" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_83cfeeac-7b4c-4bcb-b6e2-389fb7f4fd56" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_83cfeeac-7b4c-4bcb-b6e2-389fb7f4fd56_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_83cfeeac-7b4c-4bcb-b6e2-389fb7f4fd56" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_83cfeeac-7b4c-4bcb-b6e2-389fb7f4fd56_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_33acda6f-beb9-4c12-b380-e190faddd34f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_83cfeeac-7b4c-4bcb-b6e2-389fb7f4fd56" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_33acda6f-beb9-4c12-b380-e190faddd34f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_53fc3341-16bd-4bf9-a37a-e77ec3eb6a0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_33acda6f-beb9-4c12-b380-e190faddd34f" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_53fc3341-16bd-4bf9-a37a-e77ec3eb6a0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_0bf51496-28cc-4066-944b-779689bbef90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_07e8e1ba-194c-41b9-89da-d9c60471f6e0" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_0bf51496-28cc-4066-944b-779689bbef90" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_0bf51496-28cc-4066-944b-779689bbef90_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_0bf51496-28cc-4066-944b-779689bbef90" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_0bf51496-28cc-4066-944b-779689bbef90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_fe8742d0-3b98-452e-844c-a60d52b5f1be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_0bf51496-28cc-4066-944b-779689bbef90" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_fe8742d0-3b98-452e-844c-a60d52b5f1be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_00fbc1a3-05de-4e6e-959f-85a4db3ac5e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_fe8742d0-3b98-452e-844c-a60d52b5f1be" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_00fbc1a3-05de-4e6e-959f-85a4db3ac5e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeInvestmentsMember_3eac5c7e-a97f-490d-9c66-3708dc123210" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedIncomeInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_fe8742d0-3b98-452e-844c-a60d52b5f1be" xlink:to="loc_us-gaap_FixedIncomeInvestmentsMember_3eac5c7e-a97f-490d-9c66-3708dc123210" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DefinedBenefitPlanOtherInvestmentMember_0c9d816b-31e8-4e5d-9f68-d7494cd6d8b7" xlink:href="aal-20251231.xsd#aal_DefinedBenefitPlanOtherInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_fe8742d0-3b98-452e-844c-a60d52b5f1be" xlink:to="loc_aal_DefinedBenefitPlanOtherInvestmentMember_0c9d816b-31e8-4e5d-9f68-d7494cd6d8b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_c4341815-cb16-4992-b44a-5d80ec2d31b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_fe8742d0-3b98-452e-844c-a60d52b5f1be" xlink:to="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_c4341815-cb16-4992-b44a-5d80ec2d31b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivateEquityFundsMember_39515038-af85-4bcc-9c4e-857b820e128f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrivateEquityFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_fe8742d0-3b98-452e-844c-a60d52b5f1be" xlink:to="loc_us-gaap_PrivateEquityFundsMember_39515038-af85-4bcc-9c4e-857b820e128f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_88747d9b-c714-40ab-ae4f-b5eabd123f46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_07e8e1ba-194c-41b9-89da-d9c60471f6e0" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_88747d9b-c714-40ab-ae4f-b5eabd123f46" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_88747d9b-c714-40ab-ae4f-b5eabd123f46_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_88747d9b-c714-40ab-ae4f-b5eabd123f46" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_88747d9b-c714-40ab-ae4f-b5eabd123f46_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ca4a031c-8efc-4a32-9b52-98ee8ba08bf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_88747d9b-c714-40ab-ae4f-b5eabd123f46" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ca4a031c-8efc-4a32-9b52-98ee8ba08bf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel12And3Member_cbeaa3fd-d9fc-4506-a460-0e47a6189cdc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel12And3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ca4a031c-8efc-4a32-9b52-98ee8ba08bf4" xlink:to="loc_us-gaap_FairValueInputsLevel12And3Member_cbeaa3fd-d9fc-4506-a460-0e47a6189cdc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_ee8c8781-5690-4fe6-82ee-218a24aa7aa9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_cbeaa3fd-d9fc-4506-a460-0e47a6189cdc" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_ee8c8781-5690-4fe6-82ee-218a24aa7aa9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_92ebef93-bdd3-41de-a19d-d1692be15771" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_cbeaa3fd-d9fc-4506-a460-0e47a6189cdc" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_92ebef93-bdd3-41de-a19d-d1692be15771" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_83fff1e5-6761-4839-92c5-dd85cdea7ace" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_cbeaa3fd-d9fc-4506-a460-0e47a6189cdc" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_83fff1e5-6761-4839-92c5-dd85cdea7ace" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_4a115b3b-6044-4dd3-8e31-856c1dc6af08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ca4a031c-8efc-4a32-9b52-98ee8ba08bf4" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_4a115b3b-6044-4dd3-8e31-856c1dc6af08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_da9126d3-3d5b-4753-9ecf-9571e266b9ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_30beb904-a946-45a5-8396-37d4a2d8d3c9" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_da9126d3-3d5b-4753-9ecf-9571e266b9ce" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/EmployeeBenefitPlansChangesinFairValueMeasurementsofLevel3InvestmentsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#EmployeeBenefitPlansChangesinFairValueMeasurementsofLevel3InvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/EmployeeBenefitPlansChangesinFairValueMeasurementsofLevel3InvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6b04c6ed-19c1-44e8-9432-3053bf88eed9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c10a3742-0232-4e54-928d-6e5c08512d05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6b04c6ed-19c1-44e8-9432-3053bf88eed9" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c10a3742-0232-4e54-928d-6e5c08512d05" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_acb8a69b-2c2d-46bb-9d5a-6a4c193d0888" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c10a3742-0232-4e54-928d-6e5c08512d05" xlink:to="loc_dei_LegalEntityAxis_acb8a69b-2c2d-46bb-9d5a-6a4c193d0888" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_acb8a69b-2c2d-46bb-9d5a-6a4c193d0888_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_acb8a69b-2c2d-46bb-9d5a-6a4c193d0888" xlink:to="loc_dei_EntityDomain_acb8a69b-2c2d-46bb-9d5a-6a4c193d0888_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e90bc9af-56a5-477f-9fd2-67d958262981" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_acb8a69b-2c2d-46bb-9d5a-6a4c193d0888" xlink:to="loc_dei_EntityDomain_e90bc9af-56a5-477f-9fd2-67d958262981" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_51ec777f-1282-4ebc-8fd5-913cafe30800" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_e90bc9af-56a5-477f-9fd2-67d958262981" xlink:to="loc_aal_AmericanAirlinesIncMember_51ec777f-1282-4ebc-8fd5-913cafe30800" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_806269a5-b1d2-4494-a9a4-3278c1808abf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_c10a3742-0232-4e54-928d-6e5c08512d05" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_806269a5-b1d2-4494-a9a4-3278c1808abf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_806269a5-b1d2-4494-a9a4-3278c1808abf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_806269a5-b1d2-4494-a9a4-3278c1808abf" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_806269a5-b1d2-4494-a9a4-3278c1808abf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_cab0509a-d2f1-481f-acc4-2b670a47298a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_806269a5-b1d2-4494-a9a4-3278c1808abf" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_cab0509a-d2f1-481f-acc4-2b670a47298a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_cb9cee2f-9780-4523-a08d-02280b668ef7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_cab0509a-d2f1-481f-acc4-2b670a47298a" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_cb9cee2f-9780-4523-a08d-02280b668ef7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_8ae07bc8-cd46-4d9f-ae49-91863b11a94f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6b04c6ed-19c1-44e8-9432-3053bf88eed9" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_8ae07bc8-cd46-4d9f-ae49-91863b11a94f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_dccb87c8-216f-4dba-b3ca-b8eefab81935" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_8ae07bc8-cd46-4d9f-ae49-91863b11a94f" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_dccb87c8-216f-4dba-b3ca-b8eefab81935" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld_0478ecc4-d4e7-40c1-9d45-9da10ad37d71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_8ae07bc8-cd46-4d9f-ae49-91863b11a94f" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld_0478ecc4-d4e7-40c1-9d45-9da10ad37d71" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsLevel3ReconciliationIncreaseForPurchase_9ec10f85-a245-498d-8fe8-0f8475b57931" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanPlanAssetsLevel3ReconciliationIncreaseForPurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_8ae07bc8-cd46-4d9f-ae49-91863b11a94f" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsLevel3ReconciliationIncreaseForPurchase_9ec10f85-a245-498d-8fe8-0f8475b57931" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsLevel3ReconciliationDecreaseForSale_64cd6abe-998f-4c77-8989-a764aa35c0eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanPlanAssetsLevel3ReconciliationDecreaseForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_8ae07bc8-cd46-4d9f-ae49-91863b11a94f" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsLevel3ReconciliationDecreaseForSale_64cd6abe-998f-4c77-8989-a764aa35c0eb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_cdac5285-4528-4688-8c67-fdc4e3c45424" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/AccumulatedOtherComprehensiveLossComponentsofAccumulatedOtherComprehensiveIncomeLossAOCIDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#AccumulatedOtherComprehensiveLossComponentsofAccumulatedOtherComprehensiveIncomeLossAOCIDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/AccumulatedOtherComprehensiveLossComponentsofAccumulatedOtherComprehensiveIncomeLossAOCIDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1a9bd6d3-a4c9-4131-bbd9-833ebda45bed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_fd8beb88-e0d3-4637-bff5-28387326b6ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1a9bd6d3-a4c9-4131-bbd9-833ebda45bed" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_fd8beb88-e0d3-4637-bff5-28387326b6ab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_1b72d37b-f3e8-41d2-8188-b4da20fd0e15" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_fd8beb88-e0d3-4637-bff5-28387326b6ab" xlink:to="loc_dei_LegalEntityAxis_1b72d37b-f3e8-41d2-8188-b4da20fd0e15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_1b72d37b-f3e8-41d2-8188-b4da20fd0e15_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1b72d37b-f3e8-41d2-8188-b4da20fd0e15" xlink:to="loc_dei_EntityDomain_1b72d37b-f3e8-41d2-8188-b4da20fd0e15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d0bcf85b-5c88-4594-b570-334d96f974dd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1b72d37b-f3e8-41d2-8188-b4da20fd0e15" xlink:to="loc_dei_EntityDomain_d0bcf85b-5c88-4594-b570-334d96f974dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_a4c11f36-2d8f-4878-812e-9771e11f6be4" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_d0bcf85b-5c88-4594-b570-334d96f974dd" xlink:to="loc_aal_AmericanAirlinesIncMember_a4c11f36-2d8f-4878-812e-9771e11f6be4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_d91deaeb-3930-4466-ba25-d5268f8cc476" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_fd8beb88-e0d3-4637-bff5-28387326b6ab" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_d91deaeb-3930-4466-ba25-d5268f8cc476" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_d91deaeb-3930-4466-ba25-d5268f8cc476_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_d91deaeb-3930-4466-ba25-d5268f8cc476" xlink:to="loc_us-gaap_EquityComponentDomain_d91deaeb-3930-4466-ba25-d5268f8cc476_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_e163c9cb-d29c-4190-9ac2-a683a3aa3c2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_d91deaeb-3930-4466-ba25-d5268f8cc476" xlink:to="loc_us-gaap_EquityComponentDomain_e163c9cb-d29c-4190-9ac2-a683a3aa3c2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_91670e91-4c0e-4285-a451-81818ed93a83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e163c9cb-d29c-4190-9ac2-a683a3aa3c2c" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_91670e91-4c0e-4285-a451-81818ed93a83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_320e5fa6-b637-45ad-a6f2-e460205e52ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_91670e91-4c0e-4285-a451-81818ed93a83" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_320e5fa6-b637-45ad-a6f2-e460205e52ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_f6d91f43-f570-49d3-95ed-a979dda11b8f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_91670e91-4c0e-4285-a451-81818ed93a83" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_f6d91f43-f570-49d3-95ed-a979dda11b8f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AociBeforeTaxAttributableToParentRollForward_716070d6-a5a4-4ce3-91cc-0318a24841fc" xlink:href="aal-20251231.xsd#aal_AociBeforeTaxAttributableToParentRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1a9bd6d3-a4c9-4131-bbd9-833ebda45bed" xlink:to="loc_aal_AociBeforeTaxAttributableToParentRollForward_716070d6-a5a4-4ce3-91cc-0318a24841fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociBeforeTaxAttributableToParent_565f35f3-6513-4daf-b9e0-8be515b5f982" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AociBeforeTaxAttributableToParentRollForward_716070d6-a5a4-4ce3-91cc-0318a24841fc" xlink:to="loc_us-gaap_AociBeforeTaxAttributableToParent_565f35f3-6513-4daf-b9e0-8be515b5f982" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_08af781b-716f-4119-bd3d-572132e10ba9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AociBeforeTaxAttributableToParentRollForward_716070d6-a5a4-4ce3-91cc-0318a24841fc" xlink:to="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_08af781b-716f-4119-bd3d-572132e10ba9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_cf9369dc-fddf-447e-9adb-823214da1a68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AociBeforeTaxAttributableToParentRollForward_716070d6-a5a4-4ce3-91cc-0318a24841fc" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_cf9369dc-fddf-447e-9adb-823214da1a68" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_aefbfa7d-466e-4fdc-9ff8-075ee3fa75b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AociBeforeTaxAttributableToParentRollForward_716070d6-a5a4-4ce3-91cc-0318a24841fc" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_aefbfa7d-466e-4fdc-9ff8-075ee3fa75b1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociBeforeTaxAttributableToParent_eeed55af-6180-4304-a2ec-b91cb3598fc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociBeforeTaxAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AociTaxAttributableToParentRollForward_337fe2af-b3a6-40ab-aaae-adf5a8190f82" xlink:href="aal-20251231.xsd#aal_AociTaxAttributableToParentRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1a9bd6d3-a4c9-4131-bbd9-833ebda45bed" xlink:to="loc_aal_AociTaxAttributableToParentRollForward_337fe2af-b3a6-40ab-aaae-adf5a8190f82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociTaxAttributableToParent_833d7ed4-9adf-48e3-8268-cd52c9a07d10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AociTaxAttributableToParentRollForward_337fe2af-b3a6-40ab-aaae-adf5a8190f82" xlink:to="loc_us-gaap_AociTaxAttributableToParent_833d7ed4-9adf-48e3-8268-cd52c9a07d10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_0984c1e7-87f5-4d1c-9ef8-2f7eb856904a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AociTaxAttributableToParentRollForward_337fe2af-b3a6-40ab-aaae-adf5a8190f82" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_0984c1e7-87f5-4d1c-9ef8-2f7eb856904a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_fea71022-406a-40f8-8eae-fd997f64b41d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AociTaxAttributableToParentRollForward_337fe2af-b3a6-40ab-aaae-adf5a8190f82" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_fea71022-406a-40f8-8eae-fd997f64b41d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_2eeb0dd1-3084-46b8-b479-f9ad08465837" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_aal_AociTaxAttributableToParentRollForward_337fe2af-b3a6-40ab-aaae-adf5a8190f82" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_2eeb0dd1-3084-46b8-b479-f9ad08465837" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociTaxAttributableToParent_55493bee-7ca9-49b1-b8d3-36e3e3ea20bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociTaxAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_24a1335e-424f-4e59-ba5b-4784ddec9a95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1a9bd6d3-a4c9-4131-bbd9-833ebda45bed" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_24a1335e-424f-4e59-ba5b-4784ddec9a95" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_63832313-3193-4deb-887f-89f662035927" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_24a1335e-424f-4e59-ba5b-4784ddec9a95" xlink:to="loc_us-gaap_StockholdersEquity_63832313-3193-4deb-887f-89f662035927" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_45fcd080-14fc-4d02-ae92-0d9db441bea1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_24a1335e-424f-4e59-ba5b-4784ddec9a95" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_45fcd080-14fc-4d02-ae92-0d9db441bea1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_e9e51f83-1f78-40a3-a0bb-2df0db99610c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_24a1335e-424f-4e59-ba5b-4784ddec9a95" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_e9e51f83-1f78-40a3-a0bb-2df0db99610c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_95b0f143-fd0d-48a8-98e7-22f1e4b9a310" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_24a1335e-424f-4e59-ba5b-4784ddec9a95" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_95b0f143-fd0d-48a8-98e7-22f1e4b9a310" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_251ae1fe-d94a-4707-b91d-13ebe51f8456" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/AccumulatedOtherComprehensiveLossReclassificationsoutofAOCIDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#AccumulatedOtherComprehensiveLossReclassificationsoutofAOCIDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/AccumulatedOtherComprehensiveLossReclassificationsoutofAOCIDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_dae3519a-847d-4224-b32f-0e15b5f66d0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_cb5a5624-99fc-4e31-b7af-13fa26306b98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_dae3519a-847d-4224-b32f-0e15b5f66d0c" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_cb5a5624-99fc-4e31-b7af-13fa26306b98" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_157f21c2-db34-498f-8553-436b094adf53" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_cb5a5624-99fc-4e31-b7af-13fa26306b98" xlink:to="loc_dei_LegalEntityAxis_157f21c2-db34-498f-8553-436b094adf53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_157f21c2-db34-498f-8553-436b094adf53_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_157f21c2-db34-498f-8553-436b094adf53" xlink:to="loc_dei_EntityDomain_157f21c2-db34-498f-8553-436b094adf53_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6352e225-8091-4d04-988d-613d7bd9ef06" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_157f21c2-db34-498f-8553-436b094adf53" xlink:to="loc_dei_EntityDomain_6352e225-8091-4d04-988d-613d7bd9ef06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_4be7755e-6a8e-45ac-a8df-8add0e5bd594" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6352e225-8091-4d04-988d-613d7bd9ef06" xlink:to="loc_aal_AmericanAirlinesIncMember_4be7755e-6a8e-45ac-a8df-8add0e5bd594" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_2fb2f60d-1043-4935-b0de-9813d56c0874" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_cb5a5624-99fc-4e31-b7af-13fa26306b98" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_2fb2f60d-1043-4935-b0de-9813d56c0874" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_2fb2f60d-1043-4935-b0de-9813d56c0874_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2fb2f60d-1043-4935-b0de-9813d56c0874" xlink:to="loc_us-gaap_EquityComponentDomain_2fb2f60d-1043-4935-b0de-9813d56c0874_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_aa3d3fb7-6b22-4fd0-8af8-3709c8e8f5bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2fb2f60d-1043-4935-b0de-9813d56c0874" xlink:to="loc_us-gaap_EquityComponentDomain_aa3d3fb7-6b22-4fd0-8af8-3709c8e8f5bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember_52c077d0-5237-4029-b452-739fbb606368" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_aa3d3fb7-6b22-4fd0-8af8-3709c8e8f5bd" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember_52c077d0-5237-4029-b452-739fbb606368" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_8b3e6cad-344d-472e-88df-458d45f2bc47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_aa3d3fb7-6b22-4fd0-8af8-3709c8e8f5bd" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_8b3e6cad-344d-472e-88df-458d45f2bc47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_5ecf9cd1-695c-4171-8294-65ea19debfd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_dae3519a-847d-4224-b32f-0e15b5f66d0c" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_5ecf9cd1-695c-4171-8294-65ea19debfd2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/CommitmentsContingenciesandGuaranteesAircraftEngineandOtherPurchaseCommitmentsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#CommitmentsContingenciesandGuaranteesAircraftEngineandOtherPurchaseCommitmentsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/CommitmentsContingenciesandGuaranteesAircraftEngineandOtherPurchaseCommitmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentLineItems_9070b78e-c4a9-4af1-bf65-42637dea43d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentTable_406d8f89-5ca8-44e5-9d0a-cb7d39ff65b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_9070b78e-c4a9-4af1-bf65-42637dea43d7" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentTable_406d8f89-5ca8-44e5-9d0a-cb7d39ff65b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_75b0faab-34f8-49ff-853a-aafe39339dde" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_406d8f89-5ca8-44e5-9d0a-cb7d39ff65b5" xlink:to="loc_dei_LegalEntityAxis_75b0faab-34f8-49ff-853a-aafe39339dde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_75b0faab-34f8-49ff-853a-aafe39339dde_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_75b0faab-34f8-49ff-853a-aafe39339dde" xlink:to="loc_dei_EntityDomain_75b0faab-34f8-49ff-853a-aafe39339dde_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a6118612-2cc4-4a89-80c9-e55057a8abfd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_75b0faab-34f8-49ff-853a-aafe39339dde" xlink:to="loc_dei_EntityDomain_a6118612-2cc4-4a89-80c9-e55057a8abfd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_e07aa7d2-14ee-478f-bc2e-7a37b241545c" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_a6118612-2cc4-4a89-80c9-e55057a8abfd" xlink:to="loc_aal_AmericanAirlinesIncMember_e07aa7d2-14ee-478f-bc2e-7a37b241545c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_b152edb4-52e4-4edd-887d-600339deddf5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_406d8f89-5ca8-44e5-9d0a-cb7d39ff65b5" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_b152edb4-52e4-4edd-887d-600339deddf5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_b152edb4-52e4-4edd-887d-600339deddf5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_b152edb4-52e4-4edd-887d-600339deddf5" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_b152edb4-52e4-4edd-887d-600339deddf5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_2b7e9630-3d6a-45a7-9739-bf1c2ec7eeee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_b152edb4-52e4-4edd-887d-600339deddf5" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_2b7e9630-3d6a-45a7-9739-bf1c2ec7eeee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AircraftAndEngineCommitmentsMember_66248cbf-7ab1-4ff1-a89e-1b92a8e05eea" xlink:href="aal-20251231.xsd#aal_AircraftAndEngineCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_2b7e9630-3d6a-45a7-9739-bf1c2ec7eeee" xlink:to="loc_aal_AircraftAndEngineCommitmentsMember_66248cbf-7ab1-4ff1-a89e-1b92a8e05eea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_24ede1b8-0ec9-4491-aea2-adc14c43fd33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_406d8f89-5ca8-44e5-9d0a-cb7d39ff65b5" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_24ede1b8-0ec9-4491-aea2-adc14c43fd33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_24ede1b8-0ec9-4491-aea2-adc14c43fd33_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_24ede1b8-0ec9-4491-aea2-adc14c43fd33" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_24ede1b8-0ec9-4491-aea2-adc14c43fd33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_3990585e-fee8-4872-beda-572c5e8f0486" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_24ede1b8-0ec9-4491-aea2-adc14c43fd33" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_3990585e-fee8-4872-beda-572c5e8f0486" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AircraftFuelFlightEquipmentMaintenanceAndInformationTechnologySupportMember_9693e08b-1579-4279-ad11-87fb0fed7c6d" xlink:href="aal-20251231.xsd#aal_AircraftFuelFlightEquipmentMaintenanceAndInformationTechnologySupportMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_3990585e-fee8-4872-beda-572c5e8f0486" xlink:to="loc_aal_AircraftFuelFlightEquipmentMaintenanceAndInformationTechnologySupportMember_9693e08b-1579-4279-ad11-87fb0fed7c6d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_533e9c94-4fce-4a0f-a19e-5ab190a6dbad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationFiscalYearMaturityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_9070b78e-c4a9-4af1-bf65-42637dea43d7" xlink:to="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_533e9c94-4fce-4a0f-a19e-5ab190a6dbad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_6aa9a68c-b818-4c24-a958-4a76af02b82c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_533e9c94-4fce-4a0f-a19e-5ab190a6dbad" xlink:to="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_6aa9a68c-b818-4c24-a958-4a76af02b82c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInSecondYear_2fc90c12-878d-4dbb-9fd1-31354d41abce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInSecondYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_533e9c94-4fce-4a0f-a19e-5ab190a6dbad" xlink:to="loc_us-gaap_PurchaseObligationDueInSecondYear_2fc90c12-878d-4dbb-9fd1-31354d41abce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInThirdYear_04145c0b-2a2e-4fb2-bcc8-143f6aa06be0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInThirdYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_533e9c94-4fce-4a0f-a19e-5ab190a6dbad" xlink:to="loc_us-gaap_PurchaseObligationDueInThirdYear_04145c0b-2a2e-4fb2-bcc8-143f6aa06be0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInFourthYear_0022d505-ccd2-4943-8b97-677e32a7f8f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInFourthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_533e9c94-4fce-4a0f-a19e-5ab190a6dbad" xlink:to="loc_us-gaap_PurchaseObligationDueInFourthYear_0022d505-ccd2-4943-8b97-677e32a7f8f8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInFifthYear_a5582819-75c3-4d3a-bf22-aa3d5a9c38a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_533e9c94-4fce-4a0f-a19e-5ab190a6dbad" xlink:to="loc_us-gaap_PurchaseObligationDueInFifthYear_a5582819-75c3-4d3a-bf22-aa3d5a9c38a0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueAfterFifthYear_aeddc0e9-0f8b-42c1-b041-7a73ead9b0eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueAfterFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_533e9c94-4fce-4a0f-a19e-5ab190a6dbad" xlink:to="loc_us-gaap_PurchaseObligationDueAfterFifthYear_aeddc0e9-0f8b-42c1-b041-7a73ead9b0eb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligation_6bc3f8c2-0a29-47bd-a9ac-f96de9ef09b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_533e9c94-4fce-4a0f-a19e-5ab190a6dbad" xlink:to="loc_us-gaap_PurchaseObligation_6bc3f8c2-0a29-47bd-a9ac-f96de9ef09b1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepositsOnFlightEquipment_42bc5f31-2f4f-40e4-921d-19437238e6dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepositsOnFlightEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_9070b78e-c4a9-4af1-bf65-42637dea43d7" xlink:to="loc_us-gaap_DepositsOnFlightEquipment_42bc5f31-2f4f-40e4-921d-19437238e6dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationAbstract_dfb37170-0cea-49d0-8bdd-7b9e774b4a6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_9070b78e-c4a9-4af1-bf65-42637dea43d7" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationAbstract_dfb37170-0cea-49d0-8bdd-7b9e774b4a6b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary_e96a558f-44aa-43fc-b911-392b7c86e697" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationAbstract_dfb37170-0cea-49d0-8bdd-7b9e774b4a6b" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary_e96a558f-44aa-43fc-b911-392b7c86e697" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary_7d8e6740-7a67-4cf9-abf5-392597824d3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationAbstract_dfb37170-0cea-49d0-8bdd-7b9e774b4a6b" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary_7d8e6740-7a67-4cf9-abf5-392597824d3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary_61594e45-b62d-4648-8206-da7714248ff2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationAbstract_dfb37170-0cea-49d0-8bdd-7b9e774b4a6b" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary_61594e45-b62d-4648-8206-da7714248ff2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary_61cd3f54-c3e2-46a3-a242-5acc41eb4bda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationAbstract_dfb37170-0cea-49d0-8bdd-7b9e774b4a6b" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary_61cd3f54-c3e2-46a3-a242-5acc41eb4bda" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary_81480bda-8733-4064-8ce0-4784cd621110" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationAbstract_dfb37170-0cea-49d0-8bdd-7b9e774b4a6b" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary_81480bda-8733-4064-8ce0-4784cd621110" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears_ceb5eba4-3010-486e-ae44-ffb626b7a746" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationAbstract_dfb37170-0cea-49d0-8bdd-7b9e774b4a6b" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears_ceb5eba4-3010-486e-ae44-ffb626b7a746" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/CommitmentsContingenciesandGuaranteesCommitmentsunderCapacityPurchaseAgreementswithThirdPartyRegionalCarriersDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#CommitmentsContingenciesandGuaranteesCommitmentsunderCapacityPurchaseAgreementswithThirdPartyRegionalCarriersDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/CommitmentsContingenciesandGuaranteesCommitmentsunderCapacityPurchaseAgreementswithThirdPartyRegionalCarriersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_96fbd662-9996-4e2d-9160-fbaa68d9909b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationTable_6a507ac7-da8c-4744-adf8-78987438befb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_96fbd662-9996-4e2d-9160-fbaa68d9909b" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationTable_6a507ac7-da8c-4744-adf8-78987438befb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_76e30c70-0c89-4f0e-ad00-d05fb109707a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationTable_6a507ac7-da8c-4744-adf8-78987438befb" xlink:to="loc_dei_LegalEntityAxis_76e30c70-0c89-4f0e-ad00-d05fb109707a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_76e30c70-0c89-4f0e-ad00-d05fb109707a_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_76e30c70-0c89-4f0e-ad00-d05fb109707a" xlink:to="loc_dei_EntityDomain_76e30c70-0c89-4f0e-ad00-d05fb109707a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_4e4d3788-adb0-4365-9716-78500fc90779" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_76e30c70-0c89-4f0e-ad00-d05fb109707a" xlink:to="loc_dei_EntityDomain_4e4d3788-adb0-4365-9716-78500fc90779" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_f97012d8-6da5-4521-8c24-d24158f4702d" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4e4d3788-adb0-4365-9716-78500fc90779" xlink:to="loc_aal_AmericanAirlinesIncMember_f97012d8-6da5-4521-8c24-d24158f4702d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_fcdbfdfa-37b6-423b-8032-eadbc074ff69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationTable_6a507ac7-da8c-4744-adf8-78987438befb" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_fcdbfdfa-37b6-423b-8032-eadbc074ff69" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_fcdbfdfa-37b6-423b-8032-eadbc074ff69_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_fcdbfdfa-37b6-423b-8032-eadbc074ff69" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_fcdbfdfa-37b6-423b-8032-eadbc074ff69_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_f9372baf-096d-4935-878f-a5efec12941a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_fcdbfdfa-37b6-423b-8032-eadbc074ff69" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_f9372baf-096d-4935-878f-a5efec12941a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineCapacityPurchaseArrangementsMember_bb3ffb8b-b662-4f41-93dd-9a614c91b455" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineCapacityPurchaseArrangementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_f9372baf-096d-4935-878f-a5efec12941a" xlink:to="loc_us-gaap_AirlineCapacityPurchaseArrangementsMember_bb3ffb8b-b662-4f41-93dd-9a614c91b455" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ReimbursementReceivablePercentageUnderAgreement_60bdea70-f8ad-4b76-ba10-a1e58cdacd6e" xlink:href="aal-20251231.xsd#aal_ReimbursementReceivablePercentageUnderAgreement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_96fbd662-9996-4e2d-9160-fbaa68d9909b" xlink:to="loc_aal_ReimbursementReceivablePercentageUnderAgreement_60bdea70-f8ad-4b76-ba10-a1e58cdacd6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_019c5895-f736-7ebd-86d7-aece4d949684" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationFiscalYearMaturityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_96fbd662-9996-4e2d-9160-fbaa68d9909b" xlink:to="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_019c5895-f736-7ebd-86d7-aece4d949684" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_a4f39994-5ab0-4719-99fd-4bf988206c1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_019c5895-f736-7ebd-86d7-aece4d949684" xlink:to="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_a4f39994-5ab0-4719-99fd-4bf988206c1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInSecondYear_228052a6-074b-4b87-8745-4f06e6d85b53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInSecondYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_019c5895-f736-7ebd-86d7-aece4d949684" xlink:to="loc_us-gaap_PurchaseObligationDueInSecondYear_228052a6-074b-4b87-8745-4f06e6d85b53" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInThirdYear_cef764a0-8837-41b3-85fa-f371e20d8009" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInThirdYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_019c5895-f736-7ebd-86d7-aece4d949684" xlink:to="loc_us-gaap_PurchaseObligationDueInThirdYear_cef764a0-8837-41b3-85fa-f371e20d8009" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInFourthYear_dc24fd15-bfb5-4562-a3bb-a227ec5f3963" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInFourthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_019c5895-f736-7ebd-86d7-aece4d949684" xlink:to="loc_us-gaap_PurchaseObligationDueInFourthYear_dc24fd15-bfb5-4562-a3bb-a227ec5f3963" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInFifthYear_4728c8a7-114d-4915-a3be-330729791e57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_019c5895-f736-7ebd-86d7-aece4d949684" xlink:to="loc_us-gaap_PurchaseObligationDueInFifthYear_4728c8a7-114d-4915-a3be-330729791e57" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueAfterFifthYear_08f8566f-367d-4032-bf7d-3a23ff0bdfd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueAfterFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_019c5895-f736-7ebd-86d7-aece4d949684" xlink:to="loc_us-gaap_PurchaseObligationDueAfterFifthYear_08f8566f-367d-4032-bf7d-3a23ff0bdfd5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligation_bf2f522b-fcf7-45c1-94b2-89ea3ff42264" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_019c5895-f736-7ebd-86d7-aece4d949684" xlink:to="loc_us-gaap_PurchaseObligation_bf2f522b-fcf7-45c1-94b2-89ea3ff42264" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/CommitmentsContingenciesandGuaranteesAdditionalInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#CommitmentsContingenciesandGuaranteesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/CommitmentsContingenciesandGuaranteesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_cb3882bb-89d7-45ec-8b90-dbb53b1b5014" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_dei_LegalEntityAxis_cb3882bb-89d7-45ec-8b90-dbb53b1b5014" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_cb3882bb-89d7-45ec-8b90-dbb53b1b5014_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_cb3882bb-89d7-45ec-8b90-dbb53b1b5014" xlink:to="loc_dei_EntityDomain_cb3882bb-89d7-45ec-8b90-dbb53b1b5014_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_2fc32a11-c42e-4cca-a045-19d36dc05e4a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_cb3882bb-89d7-45ec-8b90-dbb53b1b5014" xlink:to="loc_dei_EntityDomain_2fc32a11-c42e-4cca-a045-19d36dc05e4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_243a9293-6169-4a61-9494-836f2b4d5927" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_2fc32a11-c42e-4cca-a045-19d36dc05e4a" xlink:to="loc_aal_AmericanAirlinesIncMember_243a9293-6169-4a61-9494-836f2b4d5927" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_TulsaMunicipalAirportTrustTMATMember_019bb3dd-a086-7bec-81bc-240107e2629e" xlink:href="aal-20251231.xsd#aal_TulsaMunicipalAirportTrustTMATMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_2fc32a11-c42e-4cca-a045-19d36dc05e4a" xlink:to="loc_aal_TulsaMunicipalAirportTrustTMATMember_019bb3dd-a086-7bec-81bc-240107e2629e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_bc17a94f-4c25-4c36-856e-5ab67a45a425" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_us-gaap_DebtInstrumentAxis_bc17a94f-4c25-4c36-856e-5ab67a45a425" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_bc17a94f-4c25-4c36-856e-5ab67a45a425_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_bc17a94f-4c25-4c36-856e-5ab67a45a425" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_bc17a94f-4c25-4c36-856e-5ab67a45a425_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_bc17a94f-4c25-4c36-856e-5ab67a45a425" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnhancedEquipmentTrustCertificateMember_3619150c-fe47-4805-9476-05464c92087c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnhancedEquipmentTrustCertificateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:to="loc_us-gaap_EnhancedEquipmentTrustCertificateMember_3619150c-fe47-4805-9476-05464c92087c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SpecialFacilityRevenueBondsMember_5880a3ea-7df3-4cab-be5b-0163e08af395" xlink:href="aal-20251231.xsd#aal_SpecialFacilityRevenueBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:to="loc_aal_SpecialFacilityRevenueBondsMember_5880a3ea-7df3-4cab-be5b-0163e08af395" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PayrollSupportProgramPromissoryNoteOneCARESActMember_74e75a54-d68a-4dde-a0c0-71dc7e18a87d" xlink:href="aal-20251231.xsd#aal_PayrollSupportProgramPromissoryNoteOneCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:to="loc_aal_PayrollSupportProgramPromissoryNoteOneCARESActMember_74e75a54-d68a-4dde-a0c0-71dc7e18a87d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ConvertibleSeniorNotes650Due2025Member_2d72343e-e9c8-45d4-a94d-38f5a73342cd" xlink:href="aal-20251231.xsd#aal_ConvertibleSeniorNotes650Due2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:to="loc_aal_ConvertibleSeniorNotes650Due2025Member_2d72343e-e9c8-45d4-a94d-38f5a73342cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PayrollSupportProgramPromissoryNoteTwoCARESActMember_064b866e-55f8-4663-9639-18603ab16b5f" xlink:href="aal-20251231.xsd#aal_PayrollSupportProgramPromissoryNoteTwoCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:to="loc_aal_PayrollSupportProgramPromissoryNoteTwoCARESActMember_064b866e-55f8-4663-9639-18603ab16b5f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PayrollSupportProgramPromissoryNoteThreeCARESActMember_534161ce-4b58-4318-b9a9-c12d3a9b0b0e" xlink:href="aal-20251231.xsd#aal_PayrollSupportProgramPromissoryNoteThreeCARESActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:to="loc_aal_PayrollSupportProgramPromissoryNoteThreeCARESActMember_534161ce-4b58-4318-b9a9-c12d3a9b0b0e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A2025TulsaMunicipalAirportTrustTMATBondsMember_019bb3dd-a086-7e89-8dd1-f31d6b0fda8b" xlink:href="aal-20251231.xsd#aal_A2025TulsaMunicipalAirportTrustTMATBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:to="loc_aal_A2025TulsaMunicipalAirportTrustTMATBondsMember_019bb3dd-a086-7e89-8dd1-f31d6b0fda8b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SpecialFacilityRevenueBondsMaturingDecember12035Member_019bb3dd-a086-7a01-bd69-c051bdeb4cc8" xlink:href="aal-20251231.xsd#aal_SpecialFacilityRevenueBondsMaturingDecember12035Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:to="loc_aal_SpecialFacilityRevenueBondsMaturingDecember12035Member_019bb3dd-a086-7a01-bd69-c051bdeb4cc8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SpecialFacilityRevenueBondsMaturingDecember12040Member_019bb3dd-a086-7dc7-9c34-a4f4c010ccea" xlink:href="aal-20251231.xsd#aal_SpecialFacilityRevenueBondsMaturingDecember12040Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:to="loc_aal_SpecialFacilityRevenueBondsMaturingDecember12040Member_019bb3dd-a086-7dc7-9c34-a4f4c010ccea" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A2015TulsaMunicipalAirportTrustTMATSpecialFacilityRevenueBonds2015TMATBondsMember_019bb3dd-a086-7bdd-91f7-c1a4a72c66f2" xlink:href="aal-20251231.xsd#aal_A2015TulsaMunicipalAirportTrustTMATSpecialFacilityRevenueBonds2015TMATBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_07b6a6a3-3853-43a8-bdd7-f6b5d5822fcc" xlink:to="loc_aal_A2015TulsaMunicipalAirportTrustTMATSpecialFacilityRevenueBonds2015TMATBondsMember_019bb3dd-a086-7bdd-91f7-c1a4a72c66f2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_720ea70f-8bdb-4d8d-b7ce-54a1adbbd276" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_720ea70f-8bdb-4d8d-b7ce-54a1adbbd276" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_720ea70f-8bdb-4d8d-b7ce-54a1adbbd276_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_720ea70f-8bdb-4d8d-b7ce-54a1adbbd276" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_720ea70f-8bdb-4d8d-b7ce-54a1adbbd276_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b481d034-3cdb-4871-b0bb-6a4a473f6203" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_720ea70f-8bdb-4d8d-b7ce-54a1adbbd276" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b481d034-3cdb-4871-b0bb-6a4a473f6203" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_0ca3768d-a5fe-45fb-80ea-322f0acbdd3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b481d034-3cdb-4871-b0bb-6a4a473f6203" xlink:to="loc_us-gaap_SecuredDebtMember_0ca3768d-a5fe-45fb-80ea-322f0acbdd3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_e4883545-2814-4dd5-bf5f-a8074515527c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b481d034-3cdb-4871-b0bb-6a4a473f6203" xlink:to="loc_us-gaap_UnsecuredDebtMember_e4883545-2814-4dd5-bf5f-a8074515527c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_06e296df-cdd0-4902-b15d-447d0b667b7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b481d034-3cdb-4871-b0bb-6a4a473f6203" xlink:to="loc_us-gaap_LineOfCreditMember_06e296df-cdd0-4902-b15d-447d0b667b7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_39ed3912-af1e-4727-88f8-a829ae8b12e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_us-gaap_LeaseContractualTermAxis_39ed3912-af1e-4727-88f8-a829ae8b12e2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_39ed3912-af1e-4727-88f8-a829ae8b12e2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_39ed3912-af1e-4727-88f8-a829ae8b12e2" xlink:to="loc_us-gaap_LeaseContractualTermDomain_39ed3912-af1e-4727-88f8-a829ae8b12e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_68775c45-5ecd-4c55-9335-779fdfeb6204" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_39ed3912-af1e-4727-88f8-a829ae8b12e2" xlink:to="loc_us-gaap_LeaseContractualTermDomain_68775c45-5ecd-4c55-9335-779fdfeb6204" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_SpecialFacilityRevenueBondsMember_50e2e0bd-89c4-48ef-9bac-16b8e15a6661" xlink:href="aal-20251231.xsd#aal_SpecialFacilityRevenueBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_68775c45-5ecd-4c55-9335-779fdfeb6204" xlink:to="loc_aal_SpecialFacilityRevenueBondsMember_50e2e0bd-89c4-48ef-9bac-16b8e15a6661" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_9a79c3df-dfa9-4d1b-a426-538738d2bf31" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_srt_ProductOrServiceAxis_9a79c3df-dfa9-4d1b-a426-538738d2bf31" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_9a79c3df-dfa9-4d1b-a426-538738d2bf31_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_9a79c3df-dfa9-4d1b-a426-538738d2bf31" xlink:to="loc_srt_ProductsAndServicesDomain_9a79c3df-dfa9-4d1b-a426-538738d2bf31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_0544e398-f5a1-4f53-bc16-d391f46ba6ec" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_9a79c3df-dfa9-4d1b-a426-538738d2bf31" xlink:to="loc_srt_ProductsAndServicesDomain_0544e398-f5a1-4f53-bc16-d391f46ba6ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegionalCarrierMember_2483c6b2-491c-4146-aabc-4f657231cb3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RegionalCarrierMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0544e398-f5a1-4f53-bc16-d391f46ba6ec" xlink:to="loc_us-gaap_RegionalCarrierMember_2483c6b2-491c-4146-aabc-4f657231cb3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9f439dc9-05d2-411a-9f71-9bf19dcdafbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9f439dc9-05d2-411a-9f71-9bf19dcdafbd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9f439dc9-05d2-411a-9f71-9bf19dcdafbd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9f439dc9-05d2-411a-9f71-9bf19dcdafbd" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9f439dc9-05d2-411a-9f71-9bf19dcdafbd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8a2a303e-2e5b-46c9-a70f-9406bf470994" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9f439dc9-05d2-411a-9f71-9bf19dcdafbd" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8a2a303e-2e5b-46c9-a70f-9406bf470994" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_dd271384-9c04-44e2-b562-c06eea6333c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8a2a303e-2e5b-46c9-a70f-9406bf470994" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_dd271384-9c04-44e2-b562-c06eea6333c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_0275de96-9504-458d-806e-c187c9b6765e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_0275de96-9504-458d-806e-c187c9b6765e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_0275de96-9504-458d-806e-c187c9b6765e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_0275de96-9504-458d-806e-c187c9b6765e" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_0275de96-9504-458d-806e-c187c9b6765e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_6feecbdb-1d83-49dd-a5a5-64e1cdc9b978" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_0275de96-9504-458d-806e-c187c9b6765e" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_6feecbdb-1d83-49dd-a5a5-64e1cdc9b978" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LAXModernizationProjectMember_7f3d7c3b-9796-4214-8fb4-566f97fa43d5" xlink:href="aal-20251231.xsd#aal_LAXModernizationProjectMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_6feecbdb-1d83-49dd-a5a5-64e1cdc9b978" xlink:to="loc_aal_LAXModernizationProjectMember_7f3d7c3b-9796-4214-8fb4-566f97fa43d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassAxis_64880455-5701-4179-9e55-110616ae0d71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnderlyingAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_us-gaap_UnderlyingAssetClassAxis_64880455-5701-4179-9e55-110616ae0d71" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_64880455-5701-4179-9e55-110616ae0d71_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnderlyingAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_64880455-5701-4179-9e55-110616ae0d71" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_64880455-5701-4179-9e55-110616ae0d71_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_7e7863b8-c801-4eec-82f5-78713d4379e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnderlyingAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_64880455-5701-4179-9e55-110616ae0d71" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_7e7863b8-c801-4eec-82f5-78713d4379e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RestrictedCashMember_e2b78346-372a-4e8e-8ce6-bfc26b57dfae" xlink:href="aal-20251231.xsd#aal_RestrictedCashMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnderlyingAssetClassDomain_7e7863b8-c801-4eec-82f5-78713d4379e6" xlink:to="loc_aal_RestrictedCashMember_e2b78346-372a-4e8e-8ce6-bfc26b57dfae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_c664d234-3fa6-4468-a67c-4de3e3f74f05" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_srt_LitigationCaseAxis_c664d234-3fa6-4468-a67c-4de3e3f74f05" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_c664d234-3fa6-4468-a67c-4de3e3f74f05_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_c664d234-3fa6-4468-a67c-4de3e3f74f05" xlink:to="loc_srt_LitigationCaseTypeDomain_c664d234-3fa6-4468-a67c-4de3e3f74f05_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_63086d1b-7065-4fc9-a0b7-2576434188e8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_c664d234-3fa6-4468-a67c-4de3e3f74f05" xlink:to="loc_srt_LitigationCaseTypeDomain_63086d1b-7065-4fc9-a0b7-2576434188e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PrivatePartyAntitrustActionsRelatedToTheNortheastAllianceMember_7a32309d-814a-42c5-863e-f41c7d7a1f56" xlink:href="aal-20251231.xsd#aal_PrivatePartyAntitrustActionsRelatedToTheNortheastAllianceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_63086d1b-7065-4fc9-a0b7-2576434188e8" xlink:to="loc_aal_PrivatePartyAntitrustActionsRelatedToTheNortheastAllianceMember_7a32309d-814a-42c5-863e-f41c7d7a1f56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_e8091556-48e5-48fb-ad9e-b4ea4532602e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_e8091556-48e5-48fb-ad9e-b4ea4532602e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e8091556-48e5-48fb-ad9e-b4ea4532602e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_e8091556-48e5-48fb-ad9e-b4ea4532602e" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e8091556-48e5-48fb-ad9e-b4ea4532602e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_ef99f4a2-beed-4006-9069-e54861cd1222" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_e8091556-48e5-48fb-ad9e-b4ea4532602e" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_ef99f4a2-beed-4006-9069-e54861cd1222" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember_31640516-30d1-43e7-bd91-1eae30f9e4cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_ef99f4a2-beed-4006-9069-e54861cd1222" xlink:to="loc_us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember_31640516-30d1-43e7-bd91-1eae30f9e4cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember_79e578ff-3e22-435d-80d8-735caafd5925" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_ef99f4a2-beed-4006-9069-e54861cd1222" xlink:to="loc_us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember_79e578ff-3e22-435d-80d8-735caafd5925" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_a096bad2-a555-4dfd-bb39-d99516bd6194" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_a096bad2-a555-4dfd-bb39-d99516bd6194" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_a096bad2-a555-4dfd-bb39-d99516bd6194_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_a096bad2-a555-4dfd-bb39-d99516bd6194" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_a096bad2-a555-4dfd-bb39-d99516bd6194_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_2c115f15-2c5b-4753-9039-284381279103" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_a096bad2-a555-4dfd-bb39-d99516bd6194" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_2c115f15-2c5b-4753-9039-284381279103" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnionizedEmployeesConcentrationRiskMember_0f329f74-f12c-44ab-9c52-8b6690067dd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnionizedEmployeesConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_2c115f15-2c5b-4753-9039-284381279103" xlink:to="loc_us-gaap_UnionizedEmployeesConcentrationRiskMember_0f329f74-f12c-44ab-9c52-8b6690067dd5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_49e8869f-4b79-47f3-bf03-06ea0ab26816" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_49e8869f-4b79-47f3-bf03-06ea0ab26816" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_49e8869f-4b79-47f3-bf03-06ea0ab26816_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_49e8869f-4b79-47f3-bf03-06ea0ab26816" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_49e8869f-4b79-47f3-bf03-06ea0ab26816_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_b83033f9-cd47-4e56-a56a-9c5a5ad78251" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_49e8869f-4b79-47f3-bf03-06ea0ab26816" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_b83033f9-cd47-4e56-a56a-9c5a5ad78251" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialGuaranteeMember_55300c9f-d7a2-4c98-aa9a-c74773c98ba4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_b83033f9-cd47-4e56-a56a-9c5a5ad78251" xlink:to="loc_us-gaap_FinancialGuaranteeMember_55300c9f-d7a2-4c98-aa9a-c74773c98ba4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_daf3505d-4a01-4593-b587-73983f199c42" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_srt_CounterpartyNameAxis_daf3505d-4a01-4593-b587-73983f199c42" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_daf3505d-4a01-4593-b587-73983f199c42_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_daf3505d-4a01-4593-b587-73983f199c42" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_daf3505d-4a01-4593-b587-73983f199c42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_15570e63-f5c4-4350-a150-43a50602a95a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_daf3505d-4a01-4593-b587-73983f199c42" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_15570e63-f5c4-4350-a150-43a50602a95a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RegionalAirportsImprovementCorporationMember_6dc25a3d-762e-4e75-9138-fa999a05a819" xlink:href="aal-20251231.xsd#aal_RegionalAirportsImprovementCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_15570e63-f5c4-4350-a150-43a50602a95a" xlink:to="loc_aal_RegionalAirportsImprovementCorporationMember_6dc25a3d-762e-4e75-9138-fa999a05a819" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_e1b5b05e-38b9-4b25-a77f-66e8438bde75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_62f4b581-498a-4f74-b29f-0795e642a9f2" xlink:to="loc_us-gaap_CreditFacilityAxis_e1b5b05e-38b9-4b25-a77f-66e8438bde75" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_e1b5b05e-38b9-4b25-a77f-66e8438bde75_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_e1b5b05e-38b9-4b25-a77f-66e8438bde75" xlink:to="loc_us-gaap_CreditFacilityDomain_e1b5b05e-38b9-4b25-a77f-66e8438bde75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_181846ae-5b80-4409-ba9e-0260cfc9c619" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_e1b5b05e-38b9-4b25-a77f-66e8438bde75" xlink:to="loc_us-gaap_CreditFacilityDomain_181846ae-5b80-4409-ba9e-0260cfc9c619" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_d5909215-fb70-43c9-b81a-f351feff18f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_181846ae-5b80-4409-ba9e-0260cfc9c619" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_d5909215-fb70-43c9-b81a-f351feff18f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PropertyPlantEquipmentExpectedCost_8dc1d2cd-b366-407b-a1bd-f8d0882655a6" xlink:href="aal-20251231.xsd#aal_PropertyPlantEquipmentExpectedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_PropertyPlantEquipmentExpectedCost_8dc1d2cd-b366-407b-a1bd-f8d0882655a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PropertyPlantAndEquipmentAmountAppropriatedToProject_94e17326-2956-4a77-b0e2-b0922b924ecd" xlink:href="aal-20251231.xsd#aal_PropertyPlantAndEquipmentAmountAppropriatedToProject"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_PropertyPlantAndEquipmentAmountAppropriatedToProject_94e17326-2956-4a77-b0e2-b0922b924ecd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2da73043-a3ec-4c20-85bd-84b53185f663" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2da73043-a3ec-4c20-85bd-84b53185f663" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_c9b8fa1e-76d5-4dad-b136-f072edf5fa19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_c9b8fa1e-76d5-4dad-b136-f072edf5fa19" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PropertyPlantAndEquipmentAmountRecoveredToDate_c6c4cfd4-a364-4561-8f1e-716a0fdb23ac" xlink:href="aal-20251231.xsd#aal_PropertyPlantAndEquipmentAmountRecoveredToDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_PropertyPlantAndEquipmentAmountRecoveredToDate_c6c4cfd4-a364-4561-8f1e-716a0fdb23ac" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PropertyPlantAndEquipmentRemainingAmountExpectedToBeRecovered_c70b15e6-81e8-4b86-9053-4405dafb0193" xlink:href="aal-20251231.xsd#aal_PropertyPlantAndEquipmentRemainingAmountExpectedToBeRecovered"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_PropertyPlantAndEquipmentRemainingAmountExpectedToBeRecovered_c70b15e6-81e8-4b86-9053-4405dafb0193" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentDisposals_e3ed3c8d-9dcc-4586-8248-3855096e0643" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentDisposals"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentDisposals_e3ed3c8d-9dcc-4586-8248-3855096e0643" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_PropertyPlantEquipmentIncurredCost_f15bdc66-77c5-473d-9c9f-bc751384187c" xlink:href="aal-20251231.xsd#aal_PropertyPlantEquipmentIncurredCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_PropertyPlantEquipmentIncurredCost_f15bdc66-77c5-473d-9c9f-bc751384187c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019bb3dd-a086-7062-9ef7-eaf6dd8633fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019bb3dd-a086-7062-9ef7-eaf6dd8633fe" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentPricingPerParValuePercentage_019bb3dd-a086-71f4-ba13-979d5a55756b" xlink:href="aal-20251231.xsd#aal_DebtInstrumentPricingPerParValuePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_DebtInstrumentPricingPerParValuePercentage_019bb3dd-a086-71f4-ba13-979d5a55756b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSecuredDebt_019bb3dd-a086-79b6-a805-d0c4d3db98fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfSecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSecuredDebt_019bb3dd-a086-79b6-a805-d0c4d3db98fd" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepaidPrincipal_019bb3dd-a086-7065-951a-09ba1f6964d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRepaidPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_DebtInstrumentRepaidPrincipal_019bb3dd-a086-7065-951a-09ba1f6964d7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ExpectedPaymentsForCapitalImprovements_019c6d82-0f38-7da9-9cb2-692bd3c4be74" xlink:href="aal-20251231.xsd#aal_ExpectedPaymentsForCapitalImprovements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_ExpectedPaymentsForCapitalImprovements_019c6d82-0f38-7da9-9cb2-692bd3c4be74" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_168839d8-6631-4968-b846-bfd426fdec2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_168839d8-6631-4968-b846-bfd426fdec2c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_NumberOfAircraftOwnedEnhancedEquipmentTrustCertificate_f3d3ea94-a859-4ab7-b740-6af311cbd6c9" xlink:href="aal-20251231.xsd#aal_NumberOfAircraftOwnedEnhancedEquipmentTrustCertificate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_NumberOfAircraftOwnedEnhancedEquipmentTrustCertificate_f3d3ea94-a859-4ab7-b740-6af311cbd6c9" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_NumberOfSpareAircraftEnginesOwnedEnhancedEquipmentTrustCertificate_6093dc15-20ad-4886-aca1-55555acbe53d" xlink:href="aal-20251231.xsd#aal_NumberOfSpareAircraftEnginesOwnedEnhancedEquipmentTrustCertificate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_NumberOfSpareAircraftEnginesOwnedEnhancedEquipmentTrustCertificate_6093dc15-20ad-4886-aca1-55555acbe53d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_5a944aa1-e91c-4c69-8230-081ea7288abb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_5a944aa1-e91c-4c69-8230-081ea7288abb" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_LettersOfCreditOutstandingAndSuretyBondsAmount_65267083-3e52-44fd-ba9a-7ca30d8e9458" xlink:href="aal-20251231.xsd#aal_LettersOfCreditOutstandingAndSuretyBondsAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_LettersOfCreditOutstandingAndSuretyBondsAmount_65267083-3e52-44fd-ba9a-7ca30d8e9458" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_NumberOfPrivatePartyPlaintiffsWhoFiledPutativeClassAction_5bf4b239-6e9f-413f-b548-5a8d61c1de4a" xlink:href="aal-20251231.xsd#aal_NumberOfPrivatePartyPlaintiffsWhoFiledPutativeClassAction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_NumberOfPrivatePartyPlaintiffsWhoFiledPutativeClassAction_5bf4b239-6e9f-413f-b548-5a8d61c1de4a" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_NumberOfAdditionalPutativeClassActionLawsuits_fde41738-918b-47ec-9457-f29da07d3594" xlink:href="aal-20251231.xsd#aal_NumberOfAdditionalPutativeClassActionLawsuits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_aal_NumberOfAdditionalPutativeClassActionLawsuits_fde41738-918b-47ec-9457-f29da07d3594" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_5b7a64c3-d16b-4008-bab6-0ec8a21ff258" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_5b7a64c3-d16b-4008-bab6-0ec8a21ff258" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_4a5c82f2-a0ac-4109-8148-59368a96a9b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_OperatingLeaseLiability_4a5c82f2-a0ac-4109-8148-59368a96a9b1" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityNumberOfEmployees_4d12ddfb-5953-4e63-b6f1-6cc2722213b8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityNumberOfEmployees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_dei_EntityNumberOfEmployees_4d12ddfb-5953-4e63-b6f1-6cc2722213b8" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_9982e551-b0e2-42d5-997f-a1243d2716b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_af3e77b0-38fe-4067-b5f8-337a6b1f732e" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_9982e551-b0e2-42d5-997f-a1243d2716b8" xlink:type="arc" order="23"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SupplementalCashFlowInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#SupplementalCashFlowInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SupplementalCashFlowInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_b27b69e9-e2d5-4372-bdbc-f60055e2502c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherSignificantNoncashTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionsTable_397fbfdb-aeea-4d44-8bcd-aeee883991e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherSignificantNoncashTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_b27b69e9-e2d5-4372-bdbc-f60055e2502c" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionsTable_397fbfdb-aeea-4d44-8bcd-aeee883991e7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_1c01106c-cc27-436d-b7f2-b8d96a28b7d8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsTable_397fbfdb-aeea-4d44-8bcd-aeee883991e7" xlink:to="loc_dei_LegalEntityAxis_1c01106c-cc27-436d-b7f2-b8d96a28b7d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_1c01106c-cc27-436d-b7f2-b8d96a28b7d8_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1c01106c-cc27-436d-b7f2-b8d96a28b7d8" xlink:to="loc_dei_EntityDomain_1c01106c-cc27-436d-b7f2-b8d96a28b7d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_81586c93-260e-4db5-986b-70a7490d40ea" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1c01106c-cc27-436d-b7f2-b8d96a28b7d8" xlink:to="loc_dei_EntityDomain_81586c93-260e-4db5-986b-70a7490d40ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_594d10db-9cfa-44f0-8026-c3bfc25edd25" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_81586c93-260e-4db5-986b-70a7490d40ea" xlink:to="loc_aal_AmericanAirlinesIncMember_594d10db-9cfa-44f0-8026-c3bfc25edd25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_e4c43e85-236e-4cd2-b342-9cd95ce44f05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_b27b69e9-e2d5-4372-bdbc-f60055e2502c" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_e4c43e85-236e-4cd2-b342-9cd95ce44f05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_0d5f04c9-2c3c-4cd9-a82f-01f656d893ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_e4c43e85-236e-4cd2-b342-9cd95ce44f05" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_0d5f04c9-2c3c-4cd9-a82f-01f656d893ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_OperatingLeaseLiabilityConvertedToFinanceLeaseLiability_2262502b-bae1-4c2f-9324-763ade89a1dd" xlink:href="aal-20251231.xsd#aal_OperatingLeaseLiabilityConvertedToFinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_e4c43e85-236e-4cd2-b342-9cd95ce44f05" xlink:to="loc_aal_OperatingLeaseLiabilityConvertedToFinanceLeaseLiability_2262502b-bae1-4c2f-9324-763ade89a1dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_FinanceLeaseLiabilityConvertedToOperatingLeaseLiability_d99a5e59-d248-4920-b7bc-0f8093476039" xlink:href="aal-20251231.xsd#aal_FinanceLeaseLiabilityConvertedToOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_e4c43e85-236e-4cd2-b342-9cd95ce44f05" xlink:to="loc_aal_FinanceLeaseLiabilityConvertedToOperatingLeaseLiability_d99a5e59-d248-4920-b7bc-0f8093476039" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_c71cc7f0-8371-4ac4-931a-55a7b543a195" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_e4c43e85-236e-4cd2-b342-9cd95ce44f05" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_c71cc7f0-8371-4ac4-931a-55a7b543a195" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_b0bd1d4c-4cdf-4742-b867-06627d915e74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_b27b69e9-e2d5-4372-bdbc-f60055e2502c" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_b0bd1d4c-4cdf-4742-b867-06627d915e74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_0473b34e-27ef-45a2-88a7-71844db9fcff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_b0bd1d4c-4cdf-4742-b867-06627d915e74" xlink:to="loc_us-gaap_InterestPaidNet_0473b34e-27ef-45a2-88a7-71844db9fcff" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SegmentDisclosuresDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#SegmentDisclosuresDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SegmentDisclosuresDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_b1b482a0-1570-4650-8f8e-f9a767b8d395" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_5daf0943-6ea9-457d-b1ac-216e9d5466ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_b1b482a0-1570-4650-8f8e-f9a767b8d395" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_5daf0943-6ea9-457d-b1ac-216e9d5466ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_dd8f2559-639d-4075-9f26-3c00e50dd171" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_5daf0943-6ea9-457d-b1ac-216e9d5466ea" xlink:to="loc_dei_LegalEntityAxis_dd8f2559-639d-4075-9f26-3c00e50dd171" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_dd8f2559-639d-4075-9f26-3c00e50dd171_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_dd8f2559-639d-4075-9f26-3c00e50dd171" xlink:to="loc_dei_EntityDomain_dd8f2559-639d-4075-9f26-3c00e50dd171_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_7b6dd066-8fac-464e-b8c5-ad62f3b12a07" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_dd8f2559-639d-4075-9f26-3c00e50dd171" xlink:to="loc_dei_EntityDomain_7b6dd066-8fac-464e-b8c5-ad62f3b12a07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_2fa7cbe6-f875-4954-875e-f1cc439a7e3e" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_7b6dd066-8fac-464e-b8c5-ad62f3b12a07" xlink:to="loc_aal_AmericanAirlinesIncMember_2fa7cbe6-f875-4954-875e-f1cc439a7e3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_7246b556-656c-4c4d-af0f-b24970fe089a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_b1b482a0-1570-4650-8f8e-f9a767b8d395" xlink:to="loc_us-gaap_NumberOfOperatingSegments_7246b556-656c-4c4d-af0f-b24970fe089a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ShareBasedCompensationAdditionalInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#ShareBasedCompensationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ShareBasedCompensationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3f6f9f99-b90e-4920-9975-33add3490ba5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3f6f9f99-b90e-4920-9975-33add3490ba5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_885c3059-3895-4859-8369-a02d32e5b4c7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3f6f9f99-b90e-4920-9975-33add3490ba5" xlink:to="loc_dei_LegalEntityAxis_885c3059-3895-4859-8369-a02d32e5b4c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_885c3059-3895-4859-8369-a02d32e5b4c7_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_885c3059-3895-4859-8369-a02d32e5b4c7" xlink:to="loc_dei_EntityDomain_885c3059-3895-4859-8369-a02d32e5b4c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_03a03926-0b56-4005-b3aa-2fd8136fb56b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_885c3059-3895-4859-8369-a02d32e5b4c7" xlink:to="loc_dei_EntityDomain_03a03926-0b56-4005-b3aa-2fd8136fb56b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_a3c546b0-f555-4d8f-b738-569e367c2913" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_03a03926-0b56-4005-b3aa-2fd8136fb56b" xlink:to="loc_aal_AmericanAirlinesIncMember_a3c546b0-f555-4d8f-b738-569e367c2913" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_6187556e-c1d4-42bd-b931-631fc53e6ab6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3f6f9f99-b90e-4920-9975-33add3490ba5" xlink:to="loc_us-gaap_PlanNameAxis_6187556e-c1d4-42bd-b931-631fc53e6ab6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_6187556e-c1d4-42bd-b931-631fc53e6ab6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_6187556e-c1d4-42bd-b931-631fc53e6ab6" xlink:to="loc_us-gaap_PlanNameDomain_6187556e-c1d4-42bd-b931-631fc53e6ab6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_e682a5de-4e60-4167-88b8-9a5953e07f21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_6187556e-c1d4-42bd-b931-631fc53e6ab6" xlink:to="loc_us-gaap_PlanNameDomain_e682a5de-4e60-4167-88b8-9a5953e07f21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A2023IncentiveAwardPlanMember_9eeb7732-1d95-4580-93c5-942267784f6e" xlink:href="aal-20251231.xsd#aal_A2023IncentiveAwardPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_e682a5de-4e60-4167-88b8-9a5953e07f21" xlink:to="loc_aal_A2023IncentiveAwardPlanMember_9eeb7732-1d95-4580-93c5-942267784f6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_84537cd5-4e26-48a3-8ada-09baa2f1d2ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3f6f9f99-b90e-4920-9975-33add3490ba5" xlink:to="loc_us-gaap_AwardTypeAxis_84537cd5-4e26-48a3-8ada-09baa2f1d2ef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_84537cd5-4e26-48a3-8ada-09baa2f1d2ef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_84537cd5-4e26-48a3-8ada-09baa2f1d2ef" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_84537cd5-4e26-48a3-8ada-09baa2f1d2ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bfbc320e-411c-4d45-a5ea-7dc40eb19a1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_84537cd5-4e26-48a3-8ada-09baa2f1d2ef" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bfbc320e-411c-4d45-a5ea-7dc40eb19a1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_6346e29e-f003-4843-8ce4-d0a8d6e94424" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bfbc320e-411c-4d45-a5ea-7dc40eb19a1c" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_6346e29e-f003-4843-8ce4-d0a8d6e94424" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RestrictedStockUnitsRSUsStockSettledMember_a110370a-8f40-4c09-9733-b4be6e0453d3" xlink:href="aal-20251231.xsd#aal_RestrictedStockUnitsRSUsStockSettledMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember_6346e29e-f003-4843-8ce4-d0a8d6e94424" xlink:to="loc_aal_RestrictedStockUnitsRSUsStockSettledMember_a110370a-8f40-4c09-9733-b4be6e0453d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CashSettledRestrictedStockUnitMember_baf5be23-d088-4384-8114-c689877a994f" xlink:href="aal-20251231.xsd#aal_CashSettledRestrictedStockUnitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember_6346e29e-f003-4843-8ce4-d0a8d6e94424" xlink:to="loc_aal_CashSettledRestrictedStockUnitMember_baf5be23-d088-4384-8114-c689877a994f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_d5f46c1c-8b15-4581-9142-f467495e3105" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_d5f46c1c-8b15-4581-9142-f467495e3105" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_bd354cb7-8f86-4249-b1c3-c6fb2cc053c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_bd354cb7-8f86-4249-b1c3-c6fb2cc053c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_21b0c49a-4646-4484-9637-d30e3ded833d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_21b0c49a-4646-4484-9637-d30e3ded833d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_e5b88e26-e703-462f-b46d-d13ebeac05c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_e5b88e26-e703-462f-b46d-d13ebeac05c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5c420087-a0f1-4e18-8f95-ccbc601d66f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5c420087-a0f1-4e18-8f95-ccbc601d66f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_c8816320-9e5f-4210-9a92-152937f1feb1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_c8816320-9e5f-4210-9a92-152937f1feb1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_6f7365a6-679d-4814-85bf-49252e4b39d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_6f7365a6-679d-4814-85bf-49252e4b39d6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_3ac5f046-2fea-478c-b85f-4e7ad2ef10b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_3ac5f046-2fea-478c-b85f-4e7ad2ef10b7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_803cd37f-4025-41f9-9d9b-5f85d2b84311" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:to="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_803cd37f-4025-41f9-9d9b-5f85d2b84311" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid_7596b96f-3802-4ddf-8d8b-ff8300d07817" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e6a24547-f84e-42dd-a44e-b7c69954bceb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid_7596b96f-3802-4ddf-8d8b-ff8300d07817" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ShareBasedCompensationRestrictedStockUnitAwardsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#ShareBasedCompensationRestrictedStockUnitAwardsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ShareBasedCompensationRestrictedStockUnitAwardsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_854a4590-77c2-44fc-9762-e32675fac4c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_15c6beb1-79ad-4e46-b6a9-e50e994d0830" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_854a4590-77c2-44fc-9762-e32675fac4c1" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_15c6beb1-79ad-4e46-b6a9-e50e994d0830" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_6c59fadc-b61e-4c4c-a2c0-cb9ca33cbb65" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_15c6beb1-79ad-4e46-b6a9-e50e994d0830" xlink:to="loc_dei_LegalEntityAxis_6c59fadc-b61e-4c4c-a2c0-cb9ca33cbb65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6c59fadc-b61e-4c4c-a2c0-cb9ca33cbb65_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_6c59fadc-b61e-4c4c-a2c0-cb9ca33cbb65" xlink:to="loc_dei_EntityDomain_6c59fadc-b61e-4c4c-a2c0-cb9ca33cbb65_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_c9e5b4dd-61b2-476a-a65f-72387156ca1c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_6c59fadc-b61e-4c4c-a2c0-cb9ca33cbb65" xlink:to="loc_dei_EntityDomain_c9e5b4dd-61b2-476a-a65f-72387156ca1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_7afc99de-f9c7-44b9-8b6d-a4a721d08d07" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_c9e5b4dd-61b2-476a-a65f-72387156ca1c" xlink:to="loc_aal_AmericanAirlinesIncMember_7afc99de-f9c7-44b9-8b6d-a4a721d08d07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_ef9eac5f-891d-4dcd-8f4d-d0911e21ad91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_15c6beb1-79ad-4e46-b6a9-e50e994d0830" xlink:to="loc_us-gaap_AwardTypeAxis_ef9eac5f-891d-4dcd-8f4d-d0911e21ad91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ef9eac5f-891d-4dcd-8f4d-d0911e21ad91_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_ef9eac5f-891d-4dcd-8f4d-d0911e21ad91" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ef9eac5f-891d-4dcd-8f4d-d0911e21ad91_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d99c8256-a233-4a8c-bf19-684cc85793f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_ef9eac5f-891d-4dcd-8f4d-d0911e21ad91" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d99c8256-a233-4a8c-bf19-684cc85793f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_78ac02b8-f959-4062-9ad3-a5e8f514506e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d99c8256-a233-4a8c-bf19-684cc85793f6" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_78ac02b8-f959-4062-9ad3-a5e8f514506e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_RestrictedStockUnitsRSUsStockSettledMember_2032f793-615c-4967-abcd-700c07b92353" xlink:href="aal-20251231.xsd#aal_RestrictedStockUnitsRSUsStockSettledMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember_78ac02b8-f959-4062-9ad3-a5e8f514506e" xlink:to="loc_aal_RestrictedStockUnitsRSUsStockSettledMember_2032f793-615c-4967-abcd-700c07b92353" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_CashSettledRestrictedStockUnitMember_1164260f-96a2-4b64-9cbd-d6b037c50678" xlink:href="aal-20251231.xsd#aal_CashSettledRestrictedStockUnitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember_78ac02b8-f959-4062-9ad3-a5e8f514506e" xlink:to="loc_aal_CashSettledRestrictedStockUnitMember_1164260f-96a2-4b64-9cbd-d6b037c50678" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_aeb80511-293b-43e7-a5d7-0703f8b50e10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_854a4590-77c2-44fc-9762-e32675fac4c1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_aeb80511-293b-43e7-a5d7-0703f8b50e10" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_43a44dcf-199b-4547-ba84-f6b4e12dfa76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_aeb80511-293b-43e7-a5d7-0703f8b50e10" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_43a44dcf-199b-4547-ba84-f6b4e12dfa76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_b52f3d0b-7c3e-4a70-a5d8-32a327e0996f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_aeb80511-293b-43e7-a5d7-0703f8b50e10" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_b52f3d0b-7c3e-4a70-a5d8-32a327e0996f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModificationsInPeriod_5cf20829-1d47-4c4f-bfae-bbc6b195fe3f" xlink:href="aal-20251231.xsd#aal_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModificationsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_aeb80511-293b-43e7-a5d7-0703f8b50e10" xlink:to="loc_aal_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModificationsInPeriod_5cf20829-1d47-4c4f-bfae-bbc6b195fe3f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_8baeb6dd-7e73-4291-96e4-ad39bf2f6417" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_aeb80511-293b-43e7-a5d7-0703f8b50e10" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_8baeb6dd-7e73-4291-96e4-ad39bf2f6417" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_5c7a9e46-f8e3-4f3b-9e02-dbc2584e3e54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_aeb80511-293b-43e7-a5d7-0703f8b50e10" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_5c7a9e46-f8e3-4f3b-9e02-dbc2584e3e54" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_b7889fc1-45a1-4dba-9b69-0c943e8b7434" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7a8a16d9-2848-4228-9b51-f2f35a28bc9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_854a4590-77c2-44fc-9762-e32675fac4c1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7a8a16d9-2848-4228-9b51-f2f35a28bc9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_c7cfcf91-b540-491b-b38b-aad6b40824bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7a8a16d9-2848-4228-9b51-f2f35a28bc9f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_c7cfcf91-b540-491b-b38b-aad6b40824bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_43a526f9-6897-4d84-b6ef-8f22bcb400b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7a8a16d9-2848-4228-9b51-f2f35a28bc9f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_43a526f9-6897-4d84-b6ef-8f22bcb400b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedInPeriodWeightedAverageGrantDateFairValue_59ed9025-0796-43a9-834e-9aacb5802529" xlink:href="aal-20251231.xsd#aal_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7a8a16d9-2848-4228-9b51-f2f35a28bc9f" xlink:to="loc_aal_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedInPeriodWeightedAverageGrantDateFairValue_59ed9025-0796-43a9-834e-9aacb5802529" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_b328c60f-8e16-44e4-a0ff-29ce4c7da86b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7a8a16d9-2848-4228-9b51-f2f35a28bc9f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_b328c60f-8e16-44e4-a0ff-29ce4c7da86b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_c4715b0c-f65f-4d7a-aa33-029868c24d68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7a8a16d9-2848-4228-9b51-f2f35a28bc9f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_c4715b0c-f65f-4d7a-aa33-029868c24d68" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_5b17d975-2558-43fb-93a3-619c401cddd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AdjustmentsToAdditionalPaidInCapitalModificationOfShareBasedAwards_e6355eee-4669-444a-8b97-ccfbab442c48" xlink:href="aal-20251231.xsd#aal_AdjustmentsToAdditionalPaidInCapitalModificationOfShareBasedAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_854a4590-77c2-44fc-9762-e32675fac4c1" xlink:to="loc_aal_AdjustmentsToAdditionalPaidInCapitalModificationOfShareBasedAwards_e6355eee-4669-444a-8b97-ccfbab442c48" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/ValuationandQualifyingAccountsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#ValuationandQualifyingAccountsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/ValuationandQualifyingAccountsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_cad0d013-8d62-48b2-8b00-b35e9cd36717" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ValuationAndQualifyingAccountsDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_71869162-9864-46d8-adcb-3b6edac39070" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ValuationAndQualifyingAccountsDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_cad0d013-8d62-48b2-8b00-b35e9cd36717" xlink:to="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_71869162-9864-46d8-adcb-3b6edac39070" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_80dfd130-1916-4e18-a375-435bac7fb987" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_71869162-9864-46d8-adcb-3b6edac39070" xlink:to="loc_dei_LegalEntityAxis_80dfd130-1916-4e18-a375-435bac7fb987" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_80dfd130-1916-4e18-a375-435bac7fb987_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_80dfd130-1916-4e18-a375-435bac7fb987" xlink:to="loc_dei_EntityDomain_80dfd130-1916-4e18-a375-435bac7fb987_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a87f1427-d5bd-4f4a-aed4-6aa340d5ed40" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_80dfd130-1916-4e18-a375-435bac7fb987" xlink:to="loc_dei_EntityDomain_a87f1427-d5bd-4f4a-aed4-6aa340d5ed40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_0ef3058f-0277-4c1b-a00e-68176a49576f" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_a87f1427-d5bd-4f4a-aed4-6aa340d5ed40" xlink:to="loc_aal_AmericanAirlinesIncMember_0ef3058f-0277-4c1b-a00e-68176a49576f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_76bbdfc4-e152-4d3c-9f09-c347f2e341c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_71869162-9864-46d8-adcb-3b6edac39070" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_76bbdfc4-e152-4d3c-9f09-c347f2e341c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_76bbdfc4-e152-4d3c-9f09-c347f2e341c4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_76bbdfc4-e152-4d3c-9f09-c347f2e341c4" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_76bbdfc4-e152-4d3c-9f09-c347f2e341c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_96f9a1bf-2f3d-46ee-93a3-3dad448686ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_76bbdfc4-e152-4d3c-9f09-c347f2e341c4" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_96f9a1bf-2f3d-46ee-93a3-3dad448686ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryValuationReserveMember_d1461b67-1a26-4c4c-847a-a6dc691be05e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryValuationReserveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_96f9a1bf-2f3d-46ee-93a3-3dad448686ae" xlink:to="loc_us-gaap_InventoryValuationReserveMember_d1461b67-1a26-4c4c-847a-a6dc691be05e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_c5ac8600-6cdf-4147-aaab-bfd5c252bace" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_cad0d013-8d62-48b2-8b00-b35e9cd36717" xlink:to="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_c5ac8600-6cdf-4147-aaab-bfd5c252bace" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_550a2849-cf47-4884-8dbf-f0dc5ef3ff3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_c5ac8600-6cdf-4147-aaab-bfd5c252bace" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_550a2849-cf47-4884-8dbf-f0dc5ef3ff3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_5248d040-e9b6-487c-8a8d-d052845bb4ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_c5ac8600-6cdf-4147-aaab-bfd5c252bace" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_5248d040-e9b6-487c-8a8d-d052845bb4ca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDeductions_5de6d6aa-4290-4ca0-a658-9615d08658b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesDeductions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_c5ac8600-6cdf-4147-aaab-bfd5c252bace" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDeductions_5de6d6aa-4290-4ca0-a658-9615d08658b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_cbf44e79-e36b-4980-a41a-04decd3d2425" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/TransactionswithRelatedPartiesNetReceivablesPayablestoRelatedPartiesDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#TransactionswithRelatedPartiesNetReceivablesPayablestoRelatedPartiesDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/TransactionswithRelatedPartiesNetReceivablesPayablestoRelatedPartiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_f3d32bdf-88b5-4409-b5a0-3e6393acdf94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_35738890-dad5-426e-9412-9c710386207c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_f3d32bdf-88b5-4409-b5a0-3e6393acdf94" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_35738890-dad5-426e-9412-9c710386207c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_a4655691-8adc-473d-bf8d-b0d759a9f645" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_35738890-dad5-426e-9412-9c710386207c" xlink:to="loc_dei_LegalEntityAxis_a4655691-8adc-473d-bf8d-b0d759a9f645" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a4655691-8adc-473d-bf8d-b0d759a9f645_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_a4655691-8adc-473d-bf8d-b0d759a9f645" xlink:to="loc_dei_EntityDomain_a4655691-8adc-473d-bf8d-b0d759a9f645_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_86c0245d-31a0-405a-80b8-25b01ce48f0c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_a4655691-8adc-473d-bf8d-b0d759a9f645" xlink:to="loc_dei_EntityDomain_86c0245d-31a0-405a-80b8-25b01ce48f0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_6f0c1fc2-a503-42a6-b522-69a40ecef5da" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_86c0245d-31a0-405a-80b8-25b01ce48f0c" xlink:to="loc_aal_AmericanAirlinesIncMember_6f0c1fc2-a503-42a6-b522-69a40ecef5da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_89dc4b00-81b7-4a9d-abfe-2689f90cfcc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_35738890-dad5-426e-9412-9c710386207c" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_89dc4b00-81b7-4a9d-abfe-2689f90cfcc6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_89dc4b00-81b7-4a9d-abfe-2689f90cfcc6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_89dc4b00-81b7-4a9d-abfe-2689f90cfcc6" xlink:to="loc_us-gaap_RelatedPartyDomain_89dc4b00-81b7-4a9d-abfe-2689f90cfcc6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_bb26747a-0789-44d1-acfe-e85175ef4b1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_89dc4b00-81b7-4a9d-abfe-2689f90cfcc6" xlink:to="loc_us-gaap_RelatedPartyDomain_bb26747a-0789-44d1-acfe-e85175ef4b1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_069390e8-1ffe-4b44-ac15-cdd538249bba" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_bb26747a-0789-44d1-acfe-e85175ef4b1c" xlink:to="loc_srt_ParentCompanyMember_069390e8-1ffe-4b44-ac15-cdd538249bba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOfCommonParentMember_0cd8130e-a769-4593-aa6e-865d37bc2f9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiaryOfCommonParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_bb26747a-0789-44d1-acfe-e85175ef4b1c" xlink:to="loc_us-gaap_SubsidiaryOfCommonParentMember_0cd8130e-a769-4593-aa6e-865d37bc2f9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019bb466-496b-7ffb-b040-461e9f1aeb0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_35738890-dad5-426e-9412-9c710386207c" xlink:to="loc_us-gaap_DebtInstrumentAxis_019bb466-496b-7ffb-b040-461e9f1aeb0e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019bb466-496b-7ffb-b040-461e9f1aeb0e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019bb466-496b-7ffb-b040-461e9f1aeb0e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019bb466-496b-7ffb-b040-461e9f1aeb0e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019bb466-496b-7577-9ab5-cc8718480cd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019bb466-496b-7ffb-b040-461e9f1aeb0e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019bb466-496b-7577-9ab5-cc8718480cd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_ConvertibleSeniorNotes650Due2025Member_019bb466-496b-72f6-95aa-09886e691e3d" xlink:href="aal-20251231.xsd#aal_ConvertibleSeniorNotes650Due2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019bb466-496b-7577-9ab5-cc8718480cd5" xlink:to="loc_aal_ConvertibleSeniorNotes650Due2025Member_019bb466-496b-72f6-95aa-09886e691e3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019bb466-496b-740b-a1df-d54c7c74788e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_35738890-dad5-426e-9412-9c710386207c" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019bb466-496b-740b-a1df-d54c7c74788e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019bb466-496b-740b-a1df-d54c7c74788e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019bb466-496b-740b-a1df-d54c7c74788e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019bb466-496b-740b-a1df-d54c7c74788e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019bb466-496b-76d3-a897-ed8963ddc17b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019bb466-496b-740b-a1df-d54c7c74788e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019bb466-496b-76d3-a897-ed8963ddc17b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019bb466-496b-714e-9db9-60d78aaef2c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019bb466-496b-76d3-a897-ed8963ddc17b" xlink:to="loc_us-gaap_SeniorNotesMember_019bb466-496b-714e-9db9-60d78aaef2c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesGrossCurrent_6b4a2789-2671-47fb-965a-2ab3b0ccc242" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesGrossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_f3d32bdf-88b5-4409-b5a0-3e6393acdf94" xlink:to="loc_us-gaap_OtherReceivablesGrossCurrent_6b4a2789-2671-47fb-965a-2ab3b0ccc242" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_6b44ac2f-931c-4621-90b9-5ef6da273804" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_f3d32bdf-88b5-4409-b5a0-3e6393acdf94" xlink:to="loc_us-gaap_AccountsPayableCurrent_6b44ac2f-931c-4621-90b9-5ef6da273804" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_c1fb0f0b-3808-4ff6-838f-d16e16577859" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_f3d32bdf-88b5-4409-b5a0-3e6393acdf94" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_c1fb0f0b-3808-4ff6-838f-d16e16577859" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineCapacityPurchaseArrangements_e3e7c59e-b7fa-42de-b959-7fed7bf077f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineCapacityPurchaseArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_f3d32bdf-88b5-4409-b5a0-3e6393acdf94" xlink:to="loc_us-gaap_AirlineCapacityPurchaseArrangements_e3e7c59e-b7fa-42de-b959-7fed7bf077f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfConvertibleDebt_019bb466-496b-7094-8eb1-0dc1edae9975" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_f3d32bdf-88b5-4409-b5a0-3e6393acdf94" xlink:to="loc_us-gaap_RepaymentsOfConvertibleDebt_019bb466-496b-7094-8eb1-0dc1edae9975" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019bb466-496b-7628-b421-80bb36bcdd76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_f3d32bdf-88b5-4409-b5a0-3e6393acdf94" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019bb466-496b-7628-b421-80bb36bcdd76" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/TransactionswithRelatedPartiesAdditionalInformationDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#TransactionswithRelatedPartiesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/TransactionswithRelatedPartiesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_ec87fabf-4c3e-4a2b-a741-9f905bc962bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_5e209827-ae2a-4817-85d5-4961161525ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_ec87fabf-4c3e-4a2b-a741-9f905bc962bd" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_5e209827-ae2a-4817-85d5-4961161525ab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_df533415-20b8-41e6-9dbc-f9f486e9d33f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_5e209827-ae2a-4817-85d5-4961161525ab" xlink:to="loc_dei_LegalEntityAxis_df533415-20b8-41e6-9dbc-f9f486e9d33f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_df533415-20b8-41e6-9dbc-f9f486e9d33f_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_df533415-20b8-41e6-9dbc-f9f486e9d33f" xlink:to="loc_dei_EntityDomain_df533415-20b8-41e6-9dbc-f9f486e9d33f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a7de6073-d3ee-4205-b793-b16d9e5cbad9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_df533415-20b8-41e6-9dbc-f9f486e9d33f" xlink:to="loc_dei_EntityDomain_a7de6073-d3ee-4205-b793-b16d9e5cbad9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_431021e1-7b75-4ca0-8405-cc4b5f3bea22" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_a7de6073-d3ee-4205-b793-b16d9e5cbad9" xlink:to="loc_aal_AmericanAirlinesIncMember_431021e1-7b75-4ca0-8405-cc4b5f3bea22" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_cc2d9c3a-9e7c-4c10-bbca-940c714aa50d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_5e209827-ae2a-4817-85d5-4961161525ab" xlink:to="loc_srt_ProductOrServiceAxis_cc2d9c3a-9e7c-4c10-bbca-940c714aa50d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_cc2d9c3a-9e7c-4c10-bbca-940c714aa50d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_cc2d9c3a-9e7c-4c10-bbca-940c714aa50d" xlink:to="loc_srt_ProductsAndServicesDomain_cc2d9c3a-9e7c-4c10-bbca-940c714aa50d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_92b0f3be-be7a-423b-b63c-d813fa6b6a0e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_cc2d9c3a-9e7c-4c10-bbca-940c714aa50d" xlink:to="loc_srt_ProductsAndServicesDomain_92b0f3be-be7a-423b-b63c-d813fa6b6a0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegionalCarrierMember_a1ed0dd9-761f-4974-8b74-50accf319122" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RegionalCarrierMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_92b0f3be-be7a-423b-b63c-d813fa6b6a0e" xlink:to="loc_us-gaap_RegionalCarrierMember_a1ed0dd9-761f-4974-8b74-50accf319122" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_88d13d7f-105f-497b-a317-f25167c16a98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_5e209827-ae2a-4817-85d5-4961161525ab" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_88d13d7f-105f-497b-a317-f25167c16a98" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_88d13d7f-105f-497b-a317-f25167c16a98_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_88d13d7f-105f-497b-a317-f25167c16a98" xlink:to="loc_us-gaap_RelatedPartyDomain_88d13d7f-105f-497b-a317-f25167c16a98_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_f86192b5-9e20-465f-a541-c1c30c049358" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_88d13d7f-105f-497b-a317-f25167c16a98" xlink:to="loc_us-gaap_RelatedPartyDomain_f86192b5-9e20-465f-a541-c1c30c049358" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOfCommonParentMember_45fc3c98-97d1-4234-ada2-02b3b32e5bf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiaryOfCommonParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_f86192b5-9e20-465f-a541-c1c30c049358" xlink:to="loc_us-gaap_SubsidiaryOfCommonParentMember_45fc3c98-97d1-4234-ada2-02b3b32e5bf9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_52a0e994-d7e3-4a0e-9369-dd33bffa9195" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_5e209827-ae2a-4817-85d5-4961161525ab" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_52a0e994-d7e3-4a0e-9369-dd33bffa9195" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_52a0e994-d7e3-4a0e-9369-dd33bffa9195_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_52a0e994-d7e3-4a0e-9369-dd33bffa9195" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_52a0e994-d7e3-4a0e-9369-dd33bffa9195_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_6e9176fd-fcd3-45d3-bc34-03b8ed5847f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_52a0e994-d7e3-4a0e-9369-dd33bffa9195" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_6e9176fd-fcd3-45d3-bc34-03b8ed5847f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineCapacityPurchaseArrangementsMember_8471d18a-f18b-48f0-a58f-ecfd289f41c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineCapacityPurchaseArrangementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_6e9176fd-fcd3-45d3-bc34-03b8ed5847f4" xlink:to="loc_us-gaap_AirlineCapacityPurchaseArrangementsMember_8471d18a-f18b-48f0-a58f-ecfd289f41c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirlineCapacityPurchaseArrangements_e4440c75-2110-4ffc-a53e-7e8bd349177a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AirlineCapacityPurchaseArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_ec87fabf-4c3e-4a2b-a741-9f905bc962bd" xlink:to="loc_us-gaap_AirlineCapacityPurchaseArrangements_e4440c75-2110-4ffc-a53e-7e8bd349177a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.aa.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="aal-20251231.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.aa.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_3b49f312-3b8f-4d25-be9b-8f3401a66c1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_99315e2c-571b-456f-8b39-19092a37d9f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_3b49f312-3b8f-4d25-be9b-8f3401a66c1c" xlink:to="loc_us-gaap_SubsequentEventTable_99315e2c-571b-456f-8b39-19092a37d9f9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_5c17d724-79a9-4fad-a1f8-cef0b9dfe89f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_99315e2c-571b-456f-8b39-19092a37d9f9" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_5c17d724-79a9-4fad-a1f8-cef0b9dfe89f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_5c17d724-79a9-4fad-a1f8-cef0b9dfe89f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_5c17d724-79a9-4fad-a1f8-cef0b9dfe89f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_5c17d724-79a9-4fad-a1f8-cef0b9dfe89f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_ce7a312e-5e0c-4613-baf5-0546134217b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_5c17d724-79a9-4fad-a1f8-cef0b9dfe89f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_ce7a312e-5e0c-4613-baf5-0546134217b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_fa8dae94-378e-47ba-8b5e-6df4d6833e3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_ce7a312e-5e0c-4613-baf5-0546134217b6" xlink:to="loc_us-gaap_SubsequentEventMember_fa8dae94-378e-47ba-8b5e-6df4d6833e3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_523442c7-6b3c-474e-a444-50c8d615c936" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_99315e2c-571b-456f-8b39-19092a37d9f9" xlink:to="loc_dei_LegalEntityAxis_523442c7-6b3c-474e-a444-50c8d615c936" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_523442c7-6b3c-474e-a444-50c8d615c936_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_523442c7-6b3c-474e-a444-50c8d615c936" xlink:to="loc_dei_EntityDomain_523442c7-6b3c-474e-a444-50c8d615c936_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6e189bd8-6971-41c7-ba45-fea4938ae09a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_523442c7-6b3c-474e-a444-50c8d615c936" xlink:to="loc_dei_EntityDomain_6e189bd8-6971-41c7-ba45-fea4938ae09a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_AmericanAirlinesIncMember_e165ae39-dad1-4e34-9a6f-e78df1faa910" xlink:href="aal-20251231.xsd#aal_AmericanAirlinesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6e189bd8-6971-41c7-ba45-fea4938ae09a" xlink:to="loc_aal_AmericanAirlinesIncMember_e165ae39-dad1-4e34-9a6f-e78df1faa910" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c2eaf-68fb-7672-a3c9-23ac0f843b8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_99315e2c-571b-456f-8b39-19092a37d9f9" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c2eaf-68fb-7672-a3c9-23ac0f843b8c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c2eaf-68fb-7672-a3c9-23ac0f843b8c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c2eaf-68fb-7672-a3c9-23ac0f843b8c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c2eaf-68fb-7672-a3c9-23ac0f843b8c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c2eaf-68fb-7939-a00d-02832cbd67a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c2eaf-68fb-7672-a3c9-23ac0f843b8c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c2eaf-68fb-7939-a00d-02832cbd67a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A850SeniorSecuredNotesDue2029Member_019c2eaf-68fb-7961-9879-c2aeec052c26" xlink:href="aal-20251231.xsd#aal_A850SeniorSecuredNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c2eaf-68fb-7939-a00d-02832cbd67a0" xlink:to="loc_aal_A850SeniorSecuredNotesDue2029Member_019c2eaf-68fb-7961-9879-c2aeec052c26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_A2025AAdvantageTermLoanFacilityMember_019c6976-be0a-776d-9837-dfcca2fadedd" xlink:href="aal-20251231.xsd#aal_A2025AAdvantageTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c2eaf-68fb-7939-a00d-02832cbd67a0" xlink:to="loc_aal_A2025AAdvantageTermLoanFacilityMember_019c6976-be0a-776d-9837-dfcca2fadedd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c2eaf-68fb-76c0-9177-4212fc07d058" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_99315e2c-571b-456f-8b39-19092a37d9f9" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c2eaf-68fb-76c0-9177-4212fc07d058" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c2eaf-68fb-76c0-9177-4212fc07d058_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c2eaf-68fb-76c0-9177-4212fc07d058" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c2eaf-68fb-76c0-9177-4212fc07d058_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c2eaf-68fb-7362-b5d4-ed5ecc64e05b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c2eaf-68fb-76c0-9177-4212fc07d058" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c2eaf-68fb-7362-b5d4-ed5ecc64e05b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019c2eaf-68fb-7b91-ba4e-1bbc1e241ceb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c2eaf-68fb-7362-b5d4-ed5ecc64e05b" xlink:to="loc_us-gaap_SecuredDebtMember_019c2eaf-68fb-7b91-ba4e-1bbc1e241ceb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019c4d6a-a139-7553-a050-05e9b78bfb47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_99315e2c-571b-456f-8b39-19092a37d9f9" xlink:to="loc_us-gaap_VariableRateAxis_019c4d6a-a139-7553-a050-05e9b78bfb47" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019c4d6a-a139-7553-a050-05e9b78bfb47_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019c4d6a-a139-7553-a050-05e9b78bfb47" xlink:to="loc_us-gaap_VariableRateDomain_019c4d6a-a139-7553-a050-05e9b78bfb47_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019c4d6a-a139-7e23-8b96-7466e0b6ed10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019c4d6a-a139-7553-a050-05e9b78bfb47" xlink:to="loc_us-gaap_VariableRateDomain_019c4d6a-a139-7e23-8b96-7466e0b6ed10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_019c4d6a-a139-7f09-bf25-56f458e15cbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019c4d6a-a139-7e23-8b96-7466e0b6ed10" xlink:to="loc_us-gaap_BaseRateMember_019c4d6a-a139-7f09-bf25-56f458e15cbd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019c4d6a-a139-7306-ab04-cc47542e78d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019c4d6a-a139-7e23-8b96-7466e0b6ed10" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019c4d6a-a139-7306-ab04-cc47542e78d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c2eaf-68fb-7483-9081-fe8ffb9e6576" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_3b49f312-3b8f-4d25-be9b-8f3401a66c1c" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c2eaf-68fb-7483-9081-fe8ffb9e6576" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate_019c4d6a-a139-76d0-ba7d-79fae674a4e6" xlink:href="aal-20251231.xsd#aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_3b49f312-3b8f-4d25-be9b-8f3401a66c1c" xlink:to="loc_aal_DebtInstrumentBasisSpreadOnVariableRateFloorInterestRate_019c4d6a-a139-76d0-ba7d-79fae674a4e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin_019c4d6a-a139-7386-b3f3-63b1adbe1d4f" xlink:href="aal-20251231.xsd#aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_3b49f312-3b8f-4d25-be9b-8f3401a66c1c" xlink:to="loc_aal_DebtInstrumentBasisSpreadOnVariableRateInterestRateMargin_019c4d6a-a139-7386-b3f3-63b1adbe1d4f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:type="arc" order="41"/>
  </link:definitionLink>
</link:linkbase>
