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Number of Spare Aircraft Engines Ordered

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Number of Aircraft with Secured Debt Financing Commitments Scheduled for Delivery

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Number of Delivered Aircraft with Secured Debt Financing Commitments

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Includes, but is not limited to, lease not yet commenced.

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Includes, but is not limited to, lease not yet commenced.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Commitments and Contingencies - Aircraft-Related Commitments and Financing Arrangements (Details) $ in Millions	Jul. 30, 2024 USD ($) aircraft	Sep. 30, 2024 USD ($) aircraft_engine aircraft	Dec. 31, 2023	Sep. 30, 2023
Aircraft Rent Commitments For Future Aircraft Deliveries
Number of delivered aircraft with secured debt financing commitments \| aircraft		69
Aircraft-Related Secured Debt
Interest Commitments
Interest commitments, remainder of fiscal year		$ 21.6
Interest commitments, 2025		81.8
Interest commitments, 2026		75.3
Interest commitments, 2027		67.9
Interest commitments, 2028		59.0
Interest commitments, 2029 and thereafter		$ 246.2
Secured Debt \| 8.00% Senior Secured Notes Due 2025
Interest Commitments
Stated interest rate percentage		8.00%	8.00%	8.00%
Non-Aircraft-Related Secured Debt, Unsecured Debt And Convertible Debt
Interest Commitments
Interest commitments, remainder of fiscal year		$ 25.3
Interest commitments, 2025		89.4
Interest commitments, 2026		5.9
Interest commitments, 2027		3.4
Interest commitments, 2028		3.4
Interest commitments, 2029 and thereafter		7.1
2027 Through 2028 \| Leased Aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft under lease transaction \| aircraft	36
2029 Through 2031 \| Other Aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft under lease transaction \| aircraft	52
Additional cash received from transaction	$ 186.0
Aircraft and Related Flight Equipment
Committed Expenditures
Committed expenditures, remainder of fiscal year		56.4
Committed expenditures, 2025		143.9
Committed expenditures, 2026		12.3
Committed expenditures, 2027		183.0
Committed expenditures, 2028		297.8
Committed expenditures, 2029 and thereafter		2,982.1
Non-aircraft Related Commitments
Committed Expenditures
Committed expenditures, remainder of fiscal year		9.6
Committed expenditures, 2025		39.0
Committed expenditures, 2026		21.7
Committed expenditures, 2027		18.0
Committed expenditures, 2028		2.0
Committed expenditures, 2029 and thereafter		$ 0.1
PurePower PW1100G-JM Engine \| 2024 Through 2031
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of spare aircraft engines ordered \| aircraft_engine		16
Airbus \| Through 2025
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft with secured debt financing commitments scheduled for delivery \| aircraft		4
Airbus \| 2024 Through 2031
Unrecorded Unconditional Purchase Obligation [Line Items]
Future aircraft to be received \| aircraft		56
Number of aircraft without secured financing commitments scheduled for delivery \| aircraft		52
Third Party Lessor \| A320 and A321
Aircraft Rent Commitments For Future Aircraft Deliveries
Operating lease payments expected for aircraft to be delivered, remainder of fiscal year		$ 1.8
Operating lease payments expected for aircraft to be delivered, 2025		33.8
Operating lease payments expected for aircraft to be delivered, 2026		40.5
Operating lease payments expected for aircraft to be delivered, 2027		101.7
Operating lease payments expected for aircraft to be delivered, 2028		196.6
Operating lease payments expected for aircraft to be delivered, 2029 and thereafter		$ 2,538.6
Third Party Lessor \| 2024 Through 2028 \| A320 and A321
Unrecorded Unconditional Purchase Obligation [Line Items]
Future aircraft to be received \| aircraft		41