Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Operating activities:
Net income (loss)		$ (142,635)	$ (103,911)
Adjustments to reconcile net loss to net cash provided by (used in) operations:
Losses reclassified from other comprehensive income		19	45
Share-based compensation		3,080	3,273
Allowance for doubtful accounts (recoveries)		1,051	6
Amortization of debt issuance costs		3,582	3,981
Depreciation and amortization		81,346	77,991
Accretion of 8.00% senior secured notes		1,052	1,052
Amortization of debt discount		2,883	3,808
Deferred income tax benefit		(15,005)	(37,851)
Loss (gain) on disposal of assets		(3,029)	7,100
Changes in operating assets and liabilities:
Accounts receivable, net		(8,052)	11,200
Deposits and other assets		(49,338)	580
Deferred heavy maintenance		(21,110)	(56,105)
Accounts payable		38,717	(37,048)
Air traffic liability		91,902	137,238
Other liabilities		(121,489)	129,853
Other		51	(435)
Net cash provided by (used in) operating activities		(136,975)	140,777
Investing activities:
Purchase of available-for-sale investment securities		(58,676)	(20,593)
Proceeds from the maturity and sale of available-for-sale investment securities		58,350	20,000
Proceeds from sale of property and equipment		138,771	23,845
Pre-delivery deposits on flight equipment, net of refunds		30,403	(25,443)
Capitalized interest		(5,726)	(4,862)
Assets under construction for others		34	0
Purchase of property and equipment		(64,338)	(60,513)
Net cash provided by (used in) investing activities		98,818	(67,566)
Financing activities:
Proceeds from issuance of long-term debt		123,500	0
Payments on debt obligations		(46,818)	(129,435)
Payments for the early extinguishment of debt		(124,007)	0
Payments on finance lease obligations		(86)	(179)
Reimbursement for assets under construction for others		(34)	0
Repurchase of common stock		(636)	(1,673)
Debt issuance costs		0	(555)
Net cash provided by (used in) financing activities		(48,081)	(131,842)
Net increase (decrease) in cash, cash equivalents, and restricted cash		(86,238)	(58,631)
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]	898,373	1,407,111
Cash payments for:
Interest, net of capitalized interest		39,897	31,999
Income taxes paid (received), net		7	466
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases		121,024	89,807
Financing cash flows for finance leases		8	10
Non-cash transactions:
Capital expenditures funded by finance lease borrowings		274	145
Capital expenditures funded by operating lease borrowings		$ 361,892	$ 202,587

[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.