Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022
Operating activities:
Net income (loss)		$ (106,260)	$ (247,109)
Adjustments to reconcile net loss to net cash provided (used) by operations:
Losses reclassified from other comprehensive income		88	102
Share-based compensation		6,753	5,723
Allowance for doubtful accounts (recoveries)		6	(108)
Amortization of debt issuance costs		7,829	6,695
Depreciation and amortization		158,533	152,660
Accretion of 8.00% senior secured notes		2,105	521
Amortization of debt discount		2,378	6,346
Deferred income tax benefit		(20,998)	(65,019)
Loss on disposal of assets		7,902	22,188
Changes in operating assets and liabilities:
Accounts receivable, net		10,531	(21,213)
Deposits and other assets		(7,339)	(21,848)
Deferred heavy maintenance		(98,656)	(58,226)
Accounts payable		(500)	22,798
Air traffic liability		50,059	179,388
Other liabilities		119,309	103,591
Other		(1,028)	278
Net cash provided (used) by operating activities		130,712	86,767
Investing activities:
Purchase of available-for-sale investment securities		(55,610)	(38,970)
Proceeds from the maturity and sale of available-for-sale investment securities		54,410	38,500
Proceeds from sale of property and equipment		36,151	0
Pre-delivery deposits on flight equipment, net of refunds		(15,134)	(7,367)
Capitalized interest		(10,863)	(8,948)
Assets under construction for others		0	(2)
Purchase of property and equipment		(130,979)	(106,271)
Net cash provided (used) in investing activities		(122,025)	(123,058)
Financing activities:
Payments on debt obligations		(241,819)	(96,755)
Payments on finance lease obligations		(293)	(421)
Reimbursement for assets under construction for others		0	2
Repurchase of common stock		(1,674)	(1,777)
Debt issuance costs		(555)	(1,200)
Net cash provided (used) by financing activities		(244,341)	(100,151)
Net increase (decrease) in cash, cash equivalents, and restricted cash		(235,654)	(136,442)
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]	1,230,088	1,292,465
Cash payments for:
Interest, net of capitalized interest		69,466	54,481
Income taxes paid (received), net		1,197	882
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases		186,225	137,408
Financing cash flows for finance leases		18	34
Non-cash transactions:
Capital expenditures funded by finance lease borrowings		145	0
Capital expenditures funded by operating lease borrowings		$ 445,969	$ 319,554

[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.