Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Net income (loss)		$ (263,812)	$ (283,486)
Adjustments to reconcile net loss to net cash provided by (used in) operations:
Losses reclassified from other comprehensive income		129	151
Share-based compensation		9,322	8,545
Allowance for doubtful accounts (recoveries)		159	(108)
Amortization of debt issuance costs		11,675	9,897
Depreciation and amortization		241,335	230,844
Accretion of 8.00% senior secured notes		3,157	782
Amortization of debt discount		5,262	10,154
Deferred income tax benefit		(66,877)	(77,538)
Loss (gain) on disposal of assets		5,652	31,562
Changes in operating assets and liabilities:
Accounts receivable, net		26,158	(43,276)
Deposits and other assets		(23,105)	(30,553)
Deferred heavy maintenance		(162,675)	(99,314)
Income tax receivable		35,712	1,527
Accounts payable		9,406	48,081
Air traffic liability		(263)	113,498
Other liabilities		106,769	46,666
Other		(1,890)	310
Net cash provided by (used in) operating activities		(63,886)	(32,258)
Investing activities:
Purchase of available-for-sale investment securities		(95,473)	(59,707)
Proceeds from the maturity and sale of available-for-sale investment securities		93,770	59,000
Proceeds from sale of property and equipment		52,466	0
Pre-delivery deposits on flight equipment, net of refunds		1,978	(15,636)
Capitalized interest		(16,117)	(13,306)
Assets under construction for others		(11,086)	(2)
Purchase of property and equipment		(211,083)	(174,751)
Net cash provided by (used in) investing activities		(185,545)	(204,402)
Financing activities:
Payments on debt obligations		(287,005)	(139,783)
Payments on finance lease obligations		(408)	(631)
Reimbursement for assets under construction for others		11,088	2
Repurchase of common stock		(1,708)	(1,807)
Debt issuance costs		(555)	(1,200)
Net cash provided by (used in) financing activities		(278,588)	(143,419)
Net increase (decrease) in cash, cash equivalents, and restricted cash		(528,019)	(380,079)
Cash, cash equivalents, and restricted cash at beginning of period	[1]	1,465,742	1,428,907
Cash, cash equivalents, and restricted cash at end of period	[1]	937,723	1,048,828
Cash payments for:
Interest, net of capitalized interest		101,729	79,791
Income taxes paid (received), net		(32,724)	(411)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases		289,465	211,944
Financing cash flows for finance leases		25	47
Non-cash transactions:
Capital expenditures funded by finance lease borrowings		145	0
Capital expenditures funded by operating lease borrowings		$ 821,133	$ 490,690

[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.