Debt and Other Obligations - Schedule of Interest Expense on Long-term Debt and Capital Leases (Details) $ in Thousands	2 Months Ended	10 Months Ended	12 Months Ended
	Mar. 12, 2025 USD ($)	Dec. 31, 2025 USD ($) aircraftLeasebackTransaction	Dec. 31, 2025 USD ($) aircraftLeasebackTransaction	Dec. 31, 2024 USD ($) aircraftLeasebackTransaction	Dec. 31, 2023 USD ($)	Mar. 18, 2025
Debt Instrument [Line Items]
Commitment and other fees	$ 20	$ 792		$ 1,340	$ 1,655
Amortization of deferred financing costs and fair value adjustments	1,004	28,056		13,100	15,453
Total	47,682	160,847		219,094	169,191
Accretion expense	0	0		3,821	4,210
Amortization of debt discount	0	$ 2,595		$ 10,156	8,145
Failed aircraft sale leaseback | aircraftLeasebackTransaction		13	13	18
Secured Debt
Debt Instrument [Line Items]
Accretion expense				$ 3,800	4,200
Interest expense				88,800	88,800
Fixed-rate term loans
Debt Instrument [Line Items]
Interest expense	13,175	$ 34,609		69,635	37,213
Unsecured debt
Debt Instrument [Line Items]
Exit revolving credit facilities		3,400
Convertible notes
Debt Instrument [Line Items]
Convertible notes	1,246	0		15,849	(3,778)
Amortization of debt discount and interest expense			$ 16,400	14,300
Revolving credit facility
Debt Instrument [Line Items]
Interest expense	3,732	7,818		4,501	0
Finance Lease Obligations
Debt Instrument [Line Items]
Interest expense	5	$ 18		33	30
DIP term loan due in 2025 | Secured Debt
Debt Instrument [Line Items]
Stated interest rate percentage		8.00%	8.00%
Interest expense	17,753	$ 0		92,621	93,010
Amortization of debt discount		300
Payroll Support Program, CARES Act | Unsecured debt
Debt Instrument [Line Items]
Interest expense	265	2,178		1,365	1,363
2015-1 EETC Class A | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Interest expense	1,879	7,293		10,078	10,962
2015-1 EETC Class B | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Interest expense	0	0		446	1,954
2015-1 EETC Class C | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Interest expense	0	0		0	777
2017-1 EETC Class AA | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Interest expense	1,036	4,122		5,561	5,990
2017-1 EETC Class A | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Interest expense	373	1,486		2,005	2,159
2017-1 EETC Class B | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Interest expense	325	227		1,748	1,881
2017-1 EETC Class C | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Interest expense		0		0	522
Equipment Notes, Series B(R) 2025-1 | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Interest expense	0	18,813		0	0
Exit secured notes
Debt Instrument [Line Items]
Interest expense	0	48,333		0	0
Exit secured notes | Secured Debt
Debt Instrument [Line Items]
Stated interest rate percentage						92.50%
Exit secured notes | Exit secured notes
Debt Instrument [Line Items]
Exit revolving credit facilities		82,600
DIP Facility | Term Loan
Debt Instrument [Line Items]
Interest expense	$ 6,869	$ 7,102		812	$ 0
Convertible Debt Due in 2026 | Convertible notes
Debt Instrument [Line Items]
Offset of market-to-market adjustment			$ 500	$ (18,100)