Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Operating activities:
Net income (loss)		$ (103,911)	$ (194,703)
Adjustments to reconcile net loss to net cash provided (used) by operations:
Losses reclassified from other comprehensive income		45	51
Share-based compensation		3,273	4,046
Allowance for doubtful accounts (recoveries)		6	0
Amortization of debt issuance costs		3,981	3,421
Depreciation and amortization		77,991	76,191
Accretion of 8.00% senior secured notes		1,052	261
Amortization of debt discount		3,808	2,538
Deferred income tax benefit		(37,851)	(49,647)
Loss on disposal of assets		7,100	11,552
Changes in operating assets and liabilities:
Accounts receivable, net		11,200	(31,844)
Deposits and other assets		580	(36,183)
Deferred heavy maintenance		(56,105)	(17,698)
Accounts payable		(37,048)	(5,188)
Air traffic liability		137,238	175,986
Other liabilities		129,853	80,568
Other		(435)	194
Net cash provided (used) by operating activities		140,777	19,545
Investing activities:
Purchase of available-for-sale investment securities		(20,593)	(26,749)
Proceeds from the maturity and sale of available-for-sale investment securities		20,000	26,500
Proceeds from sale of property and equipment		23,845	0
Pre-delivery deposits on flight equipment, net of refunds		(25,443)	(5,858)
Capitalized interest		(4,862)	(4,172)
Purchase of property and equipment		(60,513)	(47,340)
Net cash provided (used) in investing activities		(67,566)	(57,619)
Financing activities:
Payments on debt obligations		(129,435)	(44,338)
Payments on finance lease obligations		(179)	(210)
Repurchase of common stock		(1,673)	(1,772)
Debt issuance costs		(555)	(1,200)
Net cash provided (used) by financing activities		(131,842)	(47,520)
Net increase (decrease) in cash, cash equivalents, and restricted cash		(58,631)	(85,594)
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]	1,407,111	1,343,313
Cash payments for:
Interest, net of capitalized interest		31,999	25,781
Income taxes paid (received), net		466	303
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases		89,807	67,089
Financing cash flows for finance leases		10	18
Non-cash transactions:
Capital expenditures funded by finance lease borrowings		145	0
Capital expenditures funded by operating lease borrowings		$ 202,587	$ 129,213

[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.