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Lessee, Operating Lease, Liability, To Be Paid, Aircraft To Be Delivered, Year Two

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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, After Year Four

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

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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 Three

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Number Of Aircraft To Be Delivered, Remainder Of Fiscal Year

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Number Of Aircraft To Be Delivered, Year One

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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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Unrecorded Unconditional Purchase Obligation, To Be Paid, After Year Four

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

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-Name Accounting Standards Codification
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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).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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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).

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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).

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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).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in remainder of current fiscal year.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
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-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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-Topic 440
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-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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Commitments and Contingencies - Aircraft-Related Commitments and Financing Arrangements (Details) $ in Millions	Mar. 31, 2024 USD ($) aircraft aircraft_engine	Dec. 31, 2023	Mar. 31, 2023
Aircraft-Related Secured Debt
Interest Commitments
Interest commitments, remainder of fiscal year	$ 66.2
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	$ 73.9
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	$ 377.5
Committed expenditures, 2025	1,018.4
Committed expenditures, 2026	1,034.0
Committed expenditures, 2027	1,099.7
Committed expenditures, 2028	1,035.0
Committed expenditures, 2029 and thereafter	923.5
Non-aircraft Related Commitments
Committed Expenditures
Committed expenditures, remainder of fiscal year	54.0
Committed expenditures, 2025	31.0
Committed expenditures, 2026	20.9
Committed expenditures, 2027	18.1
Committed expenditures, 2028	2.0
Committed expenditures, 2029 and thereafter	$ 0.1
PurePower PW1100G-JM Engine \| 2024 Through 2029
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of spare aircraft engines ordered \| aircraft_engine	18
Airbus
Unrecorded Unconditional Purchase Obligation [Line Items]
Future aircraft to be received \| aircraft	96
Number of aircraft to be delivered, remainder of fiscal year \| aircraft	5
Number of aircraft to be delivered, next fiscal year \| aircraft	18
Airbus \| Through 2025
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft with secured debt financing commitments scheduled for delivery \| aircraft	15
Airbus \| 2024 Through 2029
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft without secured financing commitments scheduled for delivery \| aircraft	81
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	$ 46.3
Operating lease payments expected for aircraft to be delivered, 2025	137.0
Operating lease payments expected for aircraft to be delivered, 2026	154.4
Operating lease payments expected for aircraft to be delivered, 2027	154.4
Operating lease payments expected for aircraft to be delivered, 2028	154.4
Operating lease payments expected for aircraft to be delivered, 2029 and thereafter	$ 1,206.2
Third Party Lessor \| 2024 Through 2025 \| A321neos
Unrecorded Unconditional Purchase Obligation [Line Items]
Future aircraft to be received \| aircraft	18