Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net loss		$ (554,150)	$ (472,569)	$ (428,700)
Adjustments to reconcile net loss to net cash provided (used) by operations:
Losses reclassified from other comprehensive income		199	226	252
Share-based compensation		11,483	12,536	11,575
Allowance for doubtful accounts (recoveries)		(108)	(88)	(249)
Amortization of debt issuance costs		13,468	12,912	10,752
Depreciation and amortization		313,090	297,211	278,588
Accretion of convertible debt and 8.00% senior secured notes		1,421	1,272	10,138
Amortization of debt discount		13,962	0	0
Deferred income tax benefit		(148,611)	(49,502)	(46,086)
Tangible asset impairment charges		333,691	0	0
Loss on disposal of assets		46,624	3,320	2,264
Loss on extinguishment of debt		0	331,630	0
Changes in operating assets and liabilities:
Accounts receivable, net		(68,340)	(85,800)	30,486
Deposits and other assets		(28,883)	47,855	10,788
Prepaid income taxes		0	156	(223)
Deferred heavy maintenance		(149,287)	(74,083)	(75,230)
Income tax receivable		1,629	109,570	(126,447)
Accounts payable		9,032	13,057	(17,052)
Air traffic liability		47,301	(19,649)	86,558
Other liabilities		68,389	80,103	27,194
Other		68	731	118
Net cash provided (used) by operating activities		(89,022)	208,888	(225,274)
Investing activities:
Purchase of available-for-sale investment securities		(110,690)	(105,361)	(118,893)
Proceeds from the maturity and sale of available-for-sale investment securities		109,500	104,500	117,665
Pre-delivery deposits on flight equipment, net of refunds		(8,498)	(119,352)	(143,220)
Capitalized interest		(18,166)	(17,258)	(12,233)
Assets under construction for others		(2)	(1,207)	(3,944)
Purchase of property and equipment		(237,584)	(213,767)	(393,375)
Net cash used in investing activities		(265,440)	(352,445)	(554,000)
Financing activities:
Proceeds from issuance of long-term debt		591,000	614,496	1,612,391
Proceeds from issuance of common stock and warrants		0	375,662	366,783
Proceeds from stock options exercised		0	0	39
Payments on debt obligations		(193,033)	(956,788)	(254,304)
Payments for the early extinguishment of debt		0	(317,905)	0
Payments on finance lease obligations		(842)	(831)	(25,401)
Reimbursement for assets under construction for others		2	996	4,153
Repurchase of common stock		(2,359)	(1,515)	(1,669)
Debt and equity issuance costs		(3,471)	(2,775)	(40,551)
Net cash provided (used) by financing activities		391,297	(288,660)	1,661,441
Net increase (decrease) in cash, cash equivalents, and restricted cash		36,835	(432,217)	882,167
Cash, cash equivalents, and restricted cash at beginning of period	[1]	1,428,907	1,861,124	978,957
Cash, cash equivalents, and restricted cash at end of period	[1]	1,465,742	1,428,907	1,861,124
Cash payments for:
Interest, net of capitalized interest		107,443	135,500	80,837
Income taxes paid (received), net		(82)	(112,461)	(17,790)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases		295,468	261,435	180,805
Financing cash flows for finance leases		57	93	194
Non-cash transactions:
Capital expenditures funded by finance lease borrowings		0	538	565
Capital expenditures funded by operating lease borrowings		$ 897,109	$ 683,333	$ 168,526

[1] The sum of cash and cash equivalents and restricted cash on our consolidated balance sheets equals cash, cash equivalents, and restricted cash in our consolidated statements of cash flows.