Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		1 Months Ended	2 Months Ended	3 Months Ended
		Mar. 31, 2025	Mar. 12, 2025	Mar. 31, 2024
Operating activities:
Net income (loss)		$ (10,936)	$ 72,216	$ (142,635)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operations:
Losses reclassified from other comprehensive income		(2)	34	19
Share-based compensation		0	1,233	3,080
Allowance for doubtful accounts (recoveries)		0	0	1,051
Amortization of debt issuance costs		233	1,003	3,582
Fair value adjustments		160	0	0
Depreciation and amortization		11,597	54,853	81,346
Accretion of 8.00% senior secured notes		0	0	1,052
Amortization of debt discount		0	0	2,883
Deferred income tax benefit		(103)	17,481	(15,005)
Loss (gain) on disposal of assets		(19)	11,655	(3,029)
Reorganization items		0	(421,464)	0
Changes in operating assets and liabilities:
Accounts receivable, net		(10,251)	(22,726)	(8,052)
Deposits and other assets		4,668	13,597	(49,338)
Deferred heavy maintenance		(10,639)	(26,736)	(21,110)
Accounts payable		54,537	14,240	38,717
Air traffic liability		(64,147)	81,855	91,902
Other liabilities		14,516	(20,165)	(121,489)
Other		(206)	(767)	51
Net cash provided by (used in) operating activities		(10,592)	(223,691)	(136,975)
Investing activities:
Purchase of available-for-sale investment securities		(8,242)	(25,072)	(58,676)
Proceeds from the maturity and sale of available-for-sale investment securities		8,170	24,750	58,350
Proceeds from sale of property and equipment		0	0	138,771
Pre-delivery deposit and other payments on flight equipment		(706)	(1,411)	(1,836)
Pre-delivery deposit refunds on flight equipment		0	26,434	32,239
Capitalized interest		(51)	(1,331)	(5,726)
Assets under construction for others		829	2,875	34
Purchase of property and equipment		(4,154)	(7,204)	(64,338)
Net cash provided by (used in) investing activities		(4,154)	19,041	98,818
Financing activities:
Proceeds from issuance of long-term debt		215,000	0	123,500
Proceeds from issuance of common stock and warrants		0	350,000	0
Payments on debt obligations		(6,275)	(634,506)	(46,818)
Payments for the early extinguishment of debt		0	0	(124,007)
Payments on finance lease obligations		(18)	(37)	(86)
Reimbursement for assets under construction for others		(1,129)	(2,573)	(34)
Repurchase of common stock		0	0	(636)
Debt and equity financing costs		0	(13,456)	0
Net cash provided by (used in) financing activities		207,578	(300,572)	(48,081)
Net increase (decrease) in cash, cash equivalents, and restricted cash		192,832	(505,222)	(86,238)
Cash, cash equivalents, and restricted cash at beginning of period	[1]	565,225	1,070,447	984,611
Cash, cash equivalents, and restricted cash at end of period	[1]	758,057	565,225	898,373
Cash payments for:
Interest, net of capitalized interest		4,854	64,790	39,897
Income taxes paid (received), net		116	152	7
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases		48,619	96,575	121,024
Financing cash flows for finance leases		1	5	8
Non-cash transactions:
Capital expenditures funded by finance lease borrowings		0	0	274
Capital expenditures funded by operating lease borrowings		$ 0	$ 98,385	$ 361,892

[1] (1) The sum of cash and cash equivalents and restricted cash on the Company's condensed consolidated balance sheets equals cash, cash equivalents, and restricted cash in the Company's condensed consolidated statement of cash flows.