Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		2 Months Ended	4 Months Ended	6 Months Ended
		Mar. 12, 2025	Jun. 30, 2025	Jun. 30, 2024
Operating activities:
Net income (loss)		$ 72,216	$ (256,767)	$ (335,562)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operations:
Losses reclassified from other comprehensive income		34	(2)	38
Share-based compensation		1,233	1,844	3,422
Allowance for doubtful accounts (recoveries)		0	215	823
Amortization of debt issuance costs		1,003	1,349	7,069
Amortization of debt fair value adjustment (fresh start accounting)		0	11,568	0
Depreciation and amortization		54,853	74,483	165,832
Accretion of 8.00% senior secured notes		0	0	2,105
Amortization of debt discount		0	109	5,767
Deferred income tax expense (benefit)		17,481	(4,651)	(11,345)
Loss (gain) on disposal of assets		11,655	(328)	(17,076)
Reorganization items		(421,464)	0	0
Changes in operating assets and liabilities:
Accounts receivable, net		(22,726)	(17,948)	(12,005)
Deposits and other assets		13,597	(4,188)	(28,990)
Deferred heavy maintenance		(26,736)	(12,345)	(49,224)
Accounts payable		14,240	101,000	(2,599)
Air traffic liability		81,855	(111,195)	113,234
Other liabilities		(20,165)	(31,906)	(110,370)
Other		(767)	(897)	(1,112)
Net cash provided by (used in) operating activities		(223,691)	(249,659)	(269,993)
Investing activities:
Purchase of available-for-sale investment securities		(25,072)	(27,996)	(94,724)
Proceeds from the maturity and sale of available-for-sale investment securities		24,750	148,186	94,100
Proceeds from sale of property and equipment		0	0	161,581
Pre-delivery deposit and other payments on flight equipment		(1,411)	(2,823)	(1,836)
Pre-delivery deposit refunds on flight equipment		26,434	13,217	163,995
Capitalized interest		(1,331)	(262)	(10,849)
Assets under construction for others		2,875	4,206	395
Purchase of property and equipment		(7,204)	(14,081)	(60,551)
Net cash provided by (used in) investing activities		19,041	120,447	252,111
Financing activities:
Proceeds from issuance of long-term debt		0	215,000	123,500
Proceeds from issuance of common stock and warrants		350,000	0	0
Payments on debt obligations		(634,506)	(42,129)	(119,632)
Payments for the early extinguishment of debt		0	(42,966)	(124,007)
Payments on finance lease obligations		(37)	(73)	(177)
Reimbursement for assets under construction for others		(2,573)	(4,508)	(395)
Repurchase of common stock		0	0	(645)
Debt and equity financing costs		(13,456)	(1,738)	0
Net cash provided by (used in) financing activities		(300,572)	123,586	(121,356)
Net increase (decrease) in cash, cash equivalents, and restricted cash		(505,222)	(5,626)	(139,238)
Cash, cash equivalents, and restricted cash at beginning of period	[1]	1,070,447	565,225	984,611
Cash, cash equivalents, and restricted cash at end of period	[1]	565,225	559,599	845,373
Cash payments for:
Interest, net of capitalized interest		64,790	21,848	83,671
Income taxes paid (received), net		152	1,412	7,050
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases		96,575	196,602	249,778
Financing cash flows for finance leases		5	8	17
Non-cash transactions:
Capital expenditures funded by finance lease borrowings		0	0	274
Capital expenditures funded by operating lease borrowings		$ 98,385	$ 88,916	$ 731,365

[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.