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Long-Term Debt, Maturities, Repayments Of Interest And Fee Commitments [Abstract]

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Long-Term Debt, Maturities, Repayments Of Interest And Fee Commitments, To Be Paid, Year Four

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Long-Term Debt, Maturities, Repayments Of Interest And Fee Commitments, To Be Paid, Year One

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Long-Term Debt, Maturities, Repayments Of Interest And Fee Commitments, To Be Paid, Year Two

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Number Of Aircraft Under Direct Lease Transaction

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Number of Aircraft without Secured Financing Commitments Scheduled for Delivery

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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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Proceeds Received From Lease And Purchase Agreement

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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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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fifth 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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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next 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 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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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third 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 after fifth 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/2009/role/commonPracticeRef
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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 ($) aircraft	Dec. 31, 2024 USD ($) aircraft aircraft_engine	Nov. 18, 2024
Committed Expenditures
Committed expenditures, 2025		$ 2.8
Aircraft-Related Secured Debt
Interest Commitments
Interest commitments, 2025		72.3
Interest commitments, 2026		77.5
Interest commitments, 2027		71.4
Interest commitments, 2028		63.2
Interest commitments, 2029		56.8
Interest commitments, 2030 and beyond		$ 102.8
8.00% senior secured notes due in 2025 \| 8.00% senior secured notes
Interest Commitments
Stated interest rate percentage		8.00%	8.00%
Non-Aircraft-Related Secured Debt, Unsecured Debt And Convertible Debt
Interest Commitments
Interest commitments, 2025		$ 3.8
Interest commitments, 2026		3.4
Interest commitments, 2027		3.4
Interest commitments, 2028		3.4
Interest commitments, 2029		3.4
Interest commitments, 2030 and beyond		3.7
Aircraft and Related Flight Equipment
Committed Expenditures
Committed expenditures, 2025		153.3
Committed expenditures, 2026		12.3
Committed expenditures, 2027		183.0
Committed expenditures, 2028		297.8
Committed expenditures, 2029		1,124.3
Committed expenditures, 2030 and beyond		1,857.8
Non-aircraft Related Commitments
Committed Expenditures
Committed expenditures, 2025		41.1
Committed expenditures, 2026		24.0
Committed expenditures, 2027		18.5
Committed expenditures, 2028		2.0
Committed expenditures, 2029		0.1
Committed expenditures, 2030 and beyond		$ 0.0
2027 Through 2028 \| Leased Aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft under direct lease transaction \| aircraft	36
2029 Through 2031 \| Other Aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft under direct lease transaction \| aircraft	52
Proceeds received from lease and purchase agreement	$ 186.0
PurePower PW1100G-JM Engine \| 2025 Through 2031
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of spare aircraft engines ordered \| aircraft_engine		16
A320 and A321
Aircraft Rent Commitments [Abstract]
Number of delivered aircraft with secured debt financing commitments \| aircraft		67
Airbus \| 2025 Through 2031
Unrecorded Unconditional Purchase Obligation [Line Items]
Future aircraft to be received \| aircraft		55
Number of aircraft without secured financing commitments scheduled for delivery \| aircraft		52
Airbus \| Through 2025 Deliveries
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft with secured debt financing commitments scheduled for delivery \| aircraft		3
Third Party Lessor \| A320 and A321 \| 2025 Through 2028
Unrecorded Unconditional Purchase Obligation [Line Items]
Future aircraft to be received \| aircraft		39
Third Party Lessor \| A320NEO
Aircraft Rent Commitments [Abstract]
Aircraft rent commitments, 2024		$ 20.5
Aircraft rent commitments, 2025		27.1
Aircraft rent commitments, 2026		88.3
Aircraft rent commitments, 2027		183.3
Aircraft rent commitments, 2028		229.4
Aircraft rent commitments, 2029 and beyond		$ 2,204.1