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Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

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Debt and Other Obligations - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended
	Mar. 31, 2025	Mar. 12, 2025	Mar. 31, 2024	Mar. 18, 2025
Debt Instrument [Line Items]
Commitment and other fees	$ 113	$ 20	$ 415
Amortization of deferred financing costs and fair value adjustments	393	1,004	3,582
Total	9,777	47,682	54,809
Accretion expense	0	0	1,052
Amortization of debt discount	0	0	2,883
Exit Secured Notes
Debt Instrument [Line Items]
Interest expense	5,320	0	0
DIP Term Loan
Debt Instrument [Line Items]
Interest expense	$ 0	$ 6,869	$ 0
Secured Debt \| 8.00% Senior Secured Notes
Debt Instrument [Line Items]
Stated interest rate percentage	8.00%	8.00%	8.00%
Interest expense	$ 0	$ 17,753	$ 23,252
Interest expense		17,800	22,200
Accretion expense			1,100
Secured Debt \| Exit Secured Notes
Debt Instrument [Line Items]
Stated interest rate percentage				92.50%
Fixed-rate term loans
Debt Instrument [Line Items]
Interest expense	2,917	13,175	17,852
Unsecured term loans \| Payroll Support Program, CARES Act
Debt Instrument [Line Items]
Interest expense	71	265	339
Enhanced Equipment Trust Certificate \| Class A 2015-1 EETC
Debt Instrument [Line Items]
Interest expense	503	1,879	2,612
Enhanced Equipment Trust Certificate \| Class B 2015-1 EETC
Debt Instrument [Line Items]
Interest expense	0	0	442
Enhanced Equipment Trust Certificate \| Class AA 2017-1 EETC
Debt Instrument [Line Items]
Interest expense	273	1,036	1,420
Enhanced Equipment Trust Certificate \| Class A 2017-1 EETC
Debt Instrument [Line Items]
Interest expense	99	373	510
Enhanced Equipment Trust Certificate \| Class B 2017-1 EETC
Debt Instrument [Line Items]
Interest expense	86	325	445
Convertible notes
Debt Instrument [Line Items]
Convertible notes	0	1,246	3,932
Convertible notes \| Convertible notes due 2026
Debt Instrument [Line Items]
Amortization of debt discount			4,400
Offset of favorable market-to-market adjustments			500
Finance leases
Debt Instrument [Line Items]
Interest expense	2	5	8
Revolving credit facility
Debt Instrument [Line Items]
Interest expense	$ 0	$ 3,732	$ 0