Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023
Operating activities:
Net income (loss)		$ (335,562)	$ (106,260)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operations:
Losses reclassified from other comprehensive income		38	88
Share-based compensation		3,422	6,753
Allowance for doubtful accounts (recoveries)		823	6
Amortization of debt issuance costs		7,069	7,829
Depreciation and amortization		165,832	158,533
Accretion of 8.00% senior secured notes		2,105	2,105
Amortization of debt discount		5,767	2,378
Deferred income tax benefit		(11,345)	(20,998)
Loss (gain) on disposal of assets		(17,076)	7,902
Changes in operating assets and liabilities:
Accounts receivable, net		(12,005)	10,531
Deposits and other assets		(28,990)	(7,339)
Deferred heavy maintenance		(49,224)	(98,656)
Accounts payable		(2,599)	(500)
Air traffic liability		113,234	50,059
Other liabilities		(110,370)	119,309
Other		(1,112)	(1,028)
Net cash provided by (used in) operating activities		(269,993)	130,712
Investing activities:
Purchase of available-for-sale investment securities		(94,724)	(55,610)
Proceeds from the maturity and sale of available-for-sale investment securities		94,100	54,410
Proceeds from sale of property and equipment		161,581	36,151
Pre-delivery deposit payments on flight equipment		(1,836)	(70,648)
Pre-delivery deposit refunds on flight equipment		163,995	55,514
Capitalized interest		(10,849)	(10,863)
Assets under construction for others		395	0
Purchase of property and equipment		(60,551)	(130,979)
Net cash provided by (used in) investing activities		252,111	(122,025)
Financing activities:
Proceeds from issuance of long-term debt		123,500	0
Payments on debt obligations		(119,632)	(241,819)
Payments for the early extinguishment of debt		(124,007)	0
Payments on finance lease obligations		(177)	(293)
Reimbursement for assets under construction for others		(395)	0
Repurchase of common stock		(645)	(1,674)
Debt issuance costs		0	(555)
Net cash provided by (used in) financing activities		(121,356)	(244,341)
Net increase (decrease) in cash, cash equivalents, and restricted cash		(139,238)	(235,654)
Cash, cash equivalents, and restricted cash at beginning of period	[1]	984,611	1,465,742
Cash, cash equivalents, and restricted cash at end of period	[1]	845,373	1,230,088
Cash payments for:
Interest, net of capitalized interest		83,671	69,466
Income taxes paid (received), net		7,050	1,197
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases		249,778	186,225
Financing cash flows for finance leases		17	18
Non-cash transactions:
Capital expenditures funded by finance lease borrowings		274	145
Capital expenditures funded by operating lease borrowings		$ 731,365	$ 445,969

[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.