Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent	$ 2,938,074	$ 1,799,616
Long-term Debt, Current Maturities	371,542	118,075
Long-term debt and capital leases, net of current maturities and related costs	2,566,532	1,681,541
Finance Lease, Liability	635,872	403,060
Debt and Lease Obligation	(32,706)	(16,648)
Debt Issuance Costs, Net	$ 2,938,074	1,799,616
Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.44%
Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.03%
Weighted average fixed-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 1,801,078	$ 1,062,935
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.70%	6.70%
Weighted average variable-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 1,136,996	$ 736,681
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.90%	5.90%
Senior Secured Notes Due 2027 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 650,000	$ 403,009
Debt instrument, interest rate, stated percentage	7.13%
Consolidated Variable Interest Entities Due 2029
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 105,117	95,111
Consolidated Variable Interest Entities Due 2029 \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.92%
Consolidated Variable Interest Entities Due 2029 \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.19%
Revolving Credit Facilities Due 2027 \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 0	0
Secured Debt By Aircraft, Engines, Other Equipment And Real Estate \| Secured Debt
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 1,399,286	915,084
Secured Debt By Aircraft, Engines, Other Equipment And Real Estate \| Minimum [Member] \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	1.87%
Secured Debt By Aircraft, Engines, Other Equipment And Real Estate \| Maximum [Member] \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.05%
Total debt and finance lease obligations \| Unsecured debt
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 2,970,780	1,816,264
Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 180,505	$ 0
Enhanced Equipment Trust Certificate \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.13%
Enhanced Equipment Trust Certificate \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.10%

Amount of short-term and long-term debt and lease obligation.

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-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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