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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: 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 ($) aircraft	Jun. 30, 2024 USD ($) aircraft aircraft_engine	Dec. 31, 2023	Jun. 30, 2023
Subsequent Event
Unrecorded Unconditional Purchase Obligation [Line Items]
Expected cash to be returned to company upon transaction	$ 186.0
Leased Aircraft \| Subsequent Event
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft under lease transaction \| aircraft	36
Other Aircraft \| Subsequent Event
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft under lease transaction \| aircraft	52
Aircraft-Related Secured Debt
Interest Commitments
Interest commitments, remainder of fiscal year		$ 43.0
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		$ 48.2
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
A320 and A321
Aircraft Rent Commitments For Future Aircraft Deliveries
Number of delivered aircraft with secured debt financing commitments \| aircraft		69
Aircraft and Related Flight Equipment
Committed Expenditures
Committed expenditures, remainder of fiscal year		$ 54.3
Committed expenditures, 2025		215.7
Committed expenditures, 2026		191.0
Committed expenditures, 2027		1,102.5
Committed expenditures, 2028		1,118.2
Committed expenditures, 2029 and thereafter		3,008.1
Non-aircraft Related Commitments
Committed Expenditures
Committed expenditures, remainder of fiscal year		25.8
Committed expenditures, 2025		38.4
Committed expenditures, 2026		21.1
Committed expenditures, 2027		17.8
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
Unrecorded Unconditional Purchase Obligation [Line Items]
Future aircraft to be received \| aircraft		92
Airbus \| Through 2030
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft with secured debt financing commitments scheduled for delivery \| aircraft		9
Airbus \| 2024 Through 2031
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft without secured financing commitments scheduled for delivery \| aircraft		83
Third Party Lessor \| A320 Family
Aircraft Rent Commitments For Future Aircraft Deliveries
Operating lease payments expected for aircraft to be delivered, remainder of fiscal year		$ 19.7
Operating lease payments expected for aircraft to be delivered, 2025		79.3
Operating lease payments expected for aircraft to be delivered, 2026		85.7
Operating lease payments expected for aircraft to be delivered, 2027		85.7
Operating lease payments expected for aircraft to be delivered, 2028		85.7
Operating lease payments expected for aircraft to be delivered, 2029 and thereafter		$ 971.5
Third Party Lessor \| 2024 Through 2025 \| A321neos
Unrecorded Unconditional Purchase Obligation [Line Items]
Future aircraft to be received \| aircraft		14