Inactive period before expiration of mileage credits Inactive Period Before Expiration Of Mileage Credits Inactive Period Before Expiration Of Mileage Credits Supplemental information: Supplemental Cash Flow Information [Abstract] Unrealized Loss on Investments AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] Legal Proceedings Legal Matters and Contingencies [Text Block] 5.000% Senior Notes Senior Notes 5.000% Due 2022 [Member] Senior Notes 5.000% Due 2022 [Member] Convertible Note Convertible Debt [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net loss Net loss Net loss Net income (loss) Net Income (Loss) Attributable to Parent Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Short-term investments Debt Securities, Available-for-sale, Current Interest cost Defined Benefit Plan, Interest Cost Accrued salaries and wages Employee-related Liabilities, Current Statistical Measurement [Domain] Statistical Measurement [Domain] Accumulated amortization of intangibles Finite-Lived Intangible Assets, Accumulated Amortization Republic Airline Inc. Republic Airline Inc [Member] Republic Airline Inc [Member] Special termination benefits Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment Loyalty revenue - marketing services Loyalty Program, Marketing Services [Member] Loyalty Program, Marketing Services [Member] Security Exchange Name Security Exchange Name Long-term investments Equity Securities, FV-NI, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Schedule of Contract Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Additional paid-in capital Additional Paid in Capital, Common Stock Pension, retiree medical and other postretirement benefits Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Total other assets Total other assets Other Assets, Noncurrent Net current-period other comprehensive income (loss), before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Investment, Name [Axis] Investment, Name [Axis] Expected return on assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Retirement Benefits [Abstract] Retirement Benefits [Abstract] Net increase in cash and restricted cash Net increase in cash and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Airline Destination Disclosure [Line Items] Airline Destination Disclosure [Line Items] Entity File Number Entity File Number Share-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition Capacity purchases from third-party regional carriers Capacity Purchases Capacity 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Amount Recognition of revenue Recognition of revenue Contract with Customer, Liability, Revenue Recognized At-The-Market Offering At-The-Market Offering [Member] At-The-Market Offering Sale of Stock [Axis] Sale of Stock [Axis] PSP2 Warrants Payroll Support Program Two Warrants, CARES Act [Member] Payroll Support Program Two Warrants, CARES Act Variable interest rate Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] AAG's wholly-owned subsidiaries Subsidiary of Common Parent [Member] Total property and equipment, at cost Total property and equipment, at cost Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Pension and postretirement benefits Liability, Defined Benefit Plan, Noncurrent Local Phone Number Local Phone Number Credit Facility [Domain] Credit Facility [Domain] ASSETS Assets [Abstract] Related Party 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travel Loyalty Program, Travel Redemptions [Member] Loyalty Program, Travel Redemptions [Member] Current liabilities Liabilities, Current [Abstract] 2021-1 EETC - Series A 2021-1 EETC - Series A [Member] 2021-1 EETC - Series A Issuance of AAG common stock, net of offering costs Stock Issued During Period, Value, New Issues Debt Debt Disclosure [Text Block] Senior Notes Senior Notes [Member] Level 3 Fair Value, Inputs, Level 3 [Member] PSP1 Warrants Payroll Support Program One Warrants, CARES Act [Member] Payroll Support Program One Warrants, CARES Act Less accumulated depreciation and amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Aircraft fuel, spare parts and supplies, net Airline Related Inventory, Net Issuance of shares of AAG common stock (in shares) Stock Issued During Period, Shares, New Issues Document Transition Report Document Transition Report Common stock, value Common Stock, Value, Issued Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total nonoperating expense, net Total nonoperating expense, net Nonoperating other income, net Nonoperating Income (Expense) Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Retiree Medical and Other Postretirement Benefits Other Postretirement Benefits Plan [Member] Commitments and contingencies Commitments and Contingencies Percentage of revenue recovered Revenue from Contract with Customer, Percentage Of Revenue Recovered Revenue from Contract with Customer, Percentage Of Revenue Recovered Accumulated other comprehensive loss Beginning balance, net of tax Ending balance, net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax 2021-1 EETC - Series B 2021-1 EETC - Series B [Member] 2021-1 EETC - Series B Entity Emerging Growth Company Entity Emerging Growth Company Payments for salary and medical costs Payments For Restructuring, Salary And Medical Costs Payments For Restructuring, Salary And Medical Costs American Airlines, Inc. American Airlines, Inc. [Member] American Airlines, Inc. Regional expenses Airline, Capacity Purchase Arrangements Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Deferred financing costs Payments of Debt Issuance Costs Maintenance, materials and repairs Aircraft Maintenance, Materials, and Repairs PSP Financial Assistance Payroll Support Program Grant Payroll Support Program Grant Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Legal Entity [Axis] Legal Entity [Axis] Cover [Abstract] Total operating expenses Total operating expenses Costs and Expenses Decrease in international capacity in percentage Decrease In Flight Travel Compared to Prior Year, Long-haul International Capacity, Percentage Decrease In Flight Travel Compared to Prior Year, Long-haul International Capacity, Percentage Class of Stock [Axis] Class of Stock [Axis] Warrants, number of warrant shares of common stock (in shares) Class Of Warrant Or Right, 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Promissory Note Three, CARES Act [Member] Payroll Support Program Promissory Note Three, CARES Act Document Information [Table] Document Information [Table] Equity [Abstract] Equity [Abstract] Carrying Value Reported Value Measurement [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Document Quarterly Report Document Quarterly Report Sales of short-term investments Proceeds from Sale of Short-term Investments Interest income Investment Income, Interest Common Stock, $0.01 par value per share Common Stock Common Stock [Member] AOCI attributable to parent, before tax [Roll Forward] AOCI Before Tax, Attributable To Parent [Roll Forward] AOCI Before Tax, Attributable To Parent [Roll Forward] 5.75% Senior Notes Senior Note 5.75% Matures 2029 [Member] Senior Note 5.75% Matures 2029 Other comprehensive loss before reclassifications, net of tax OCI, before Reclassifications, Net of Tax, Attributable to Parent Operating loss Operating loss Operating Income (Loss) 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the period that are infrequent in occurrence or unusual in nature. Enhanced Equipment Trust Certificates 2021-1 Enhanced Equipment Trust Certificates 2021-1 [Member] Enhanced Equipment Trust Certificates 2021-1 Restricted stock unit awards Restricted Stock Units (RSUs) [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category Operating loss carryforwards and other carryforwards, subject to expiration Operating Loss Carryforwards And Other Carryforwards, Subject To Expiration Operating Loss Carryforwards And Other Carryforwards, Subject To Expiration 3.75% Senior Notes Senior Notes 3.75% Due 2025 [Member] Senior Notes 3.75% Due 2025 [Member] Special items, net Restructuring And Other Expense (Income), Mainline Restructuring And Other Expense (Income), Mainline Income Statement [Abstract] Income Statement [Abstract] Fair Value Estimate of Fair Value Measurement [Member] Entity Registrant Name Entity Registrant Name Basis of Presentation Basis of Presentation and 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Obligation Statement [Line Items] Statement [Line Items] Total property and equipment, net Total property and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Preliminary settlement amount Litigation Settlement, Amount Awarded to Other Party 6.50% Senior Notes Senior Notes 6.50% Due 2025 [Member] Senior Notes 6.50% Due 2025 Retirement Plan Type [Domain] Retirement Plan Type [Domain] Federal Domestic Tax Authority [Member] Contract term Revenue, Performance Obligation, Description of Timing Schedule of Carrying Value and Estimated Fair Value of Long-Term Debt, Including Current Maturities Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Level 2 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comprehensive income, net of tax Other comprehensive income, net Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Title of 12(b) Security Title of 12(b) Security Airline Expenses [Abstract] Airline Expenses [Abstract] Net current-period other comprehensive income (loss), tax Other Comprehensive Income (Loss), Tax Total assets Total assets Assets Proceeds from sale-leaseback transactions Proceeds From Sale Of Property Plant And Equipment and Sale Leaseback Transactions Proceeds From Sale Of Property Plant And Equipment and Sale Leaseback Transactions Investment, Name [Domain] Investment, Name [Domain] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Interest paid, net Interest Paid, Excluding Capitalized Interest, Operating Activities Document Type Document Type AAG Parent Company [Member] Product and Service [Domain] Product and Service [Domain] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction 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Accounts Payable, Current Summary of Assets Measured at Fair Value on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Treasury Loan Warrant Treasury Loan Warrant Agreement, CARES Act [Member] Treasury Loan Warrant Agreement, CARES Act Fleet impairment Flight Equipment, Operating Lease, And Inventory Impairment Loss Flight Equipment, Operating Lease, And Inventory Impairment Loss Components of Special Items, Net in Condensed Consolidated Statements of Operations Restructuring and Related Costs [Table Text Block] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Operating revenues: Revenues [Abstract] Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Document Period End Date Document Period End Date Entity Central Index Key Entity Central Index Key Antidilutive Securities Excluded from Computation of 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[Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Operating expenses: Costs and Expenses [Abstract] Decrease (increase) in restricted short-term investments Increase (Decrease) In Restricted Short-Term Investments Increase (Decrease) In Short-Term Investments Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] 6.50% convertible senior notes Convertible Debt Securities [Member] Entity Current Reporting Status Entity Current Reporting Status Long-term Purchase Commitment [Table] Long-term Purchase Commitment [Table] Entities [Table] Entities [Table] Other rent and landing fees Landing Fees and Other Rentals Salaries, wages and benefits Labor and Related Expense Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Investments [Domain] Investments [Domain] Restricted cash included in restricted 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Components of Net Periodic Benefit Cost (Income) Schedule of Net Benefit Costs [Table Text Block] Atlantic Atlantic Destination [Member] Measurement Basis [Axis] Measurement Basis [Axis] Anti-Dilutive Securities Excluded From Calculation of Diluted EPS Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Restricted cash and short-term investments Restricted Cash and Cash Equivalents and Short-Term Investments, Fair Value Disclosure Restricted Cash and Cash Equivalents and Short-Term Investments, Fair Value Disclosure Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Nonoperating income (expense): Nonoperating Income (Expense) [Abstract] Domestic Domestic Destination [Member] Credit Facility [Axis] Credit Facility [Axis] Entity Address, Address Line One Entity Address, Address Line One Net cash used in investing activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Investments Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Entity Shell Company Entity Shell Company Republic Airways Holdings, Inc. Republic Airways Holdings, Inc. [Member] Republic Airways Holdings, Inc. [Member] Total current liabilities Total current liabilities Liabilities, Current Shares withheld for taxes pursuant to employee stock plans Payment, Tax Withholding, Share-based Payment Arrangement Concept not found: {http://fasb.org/us-gaap/2021-01-31}ClassOfStockDomain Class of Stock [Domain] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Money Market Funds Money Market Funds [Member] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Current Fiscal Year End Date Current Fiscal Year End Date Less: Total unamortized debt discount, premium and issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement [Table] Statement [Table] Airline Destination [Table] Airline Destination [Table] 2014 Revolving Facility Credit Facility 2014 [Member] Credit Facility 2014 [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Latin America Latin America Destination [Member] Payroll Support Program Promissory Note One, CARES Act Payroll Support Program Promissory Note One, CARES Act [Member] Payroll Support Program Promissory Note One, CARES Act Goodwill Goodwill Extinguishment of debt Extinguishment of Debt, Amount AAdvantage Term Loan Facility AAdvantage Term Loan Facility [Member] AAdvantage Term Loan Facility Pension Benefits Pension Plan [Member] 2013 Revolving Facility Credit Facility 2013 [Member] Credit Facility 2013 [Member] Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Transactions with Related Parties Related Party Transactions Disclosure [Text Block] Number of putative class action lawsuits Number Of Putative Class Action Lawsuits Number of putative class action lawsuits. Pension, Retiree Medical and Other Postretirement Benefits Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Other revenue Other Revenue [Member] Other Revenue [Member] Accounting Standards Update 2020-06 [Member]