Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Operating activities:
Net income (loss)		$ (271,396,000)	$ 254,041,000
Adjustments to reconcile net income (loss) to net cash provided by operations:
Losses reclassified from other comprehensive income		191,000	220,000
Share-based compensation		8,596,000	8,128,000
Allowance for doubtful accounts (recoveries)		(249,000)	0
Amortization of debt issuance costs		7,337,000	6,540,000
Depreciation and amortization		206,455,000	163,351,000
Accretion of convertible debt and 8.00% senior secured notes		5,898,000	0
Deferred income tax expense		501,000	91,688,000
Loss on disposal of assets		0	16,873,000
Changes in operating assets and liabilities:
Accounts receivable, net		22,244,000	(23,712,000)
Aircraft maintenance deposits, net		25,044,000	(14,955,000)
Prepaid income taxes		0	1,431,000
Deposits and other assets		(11,038,000)	(24,474,000)
Deferred heavy maintenance, net		(66,196,000)	(123,299,000)
Income tax receivable		(125,948,000)	(21,693,000)
Accounts payable		(9,506,000)	883,000
Air traffic liability		114,484,000	69,237,000
Other liabilities		(35,832,000)	(45,169,000)
Other		30,000	(693,000)
Net cash provided (used) by operating activities		(129,385,000)	358,397,000
Investing activities:
Purchase of available-for-sale investment securities		(95,302,000)	(93,557,000)
Proceeds from the maturity and sale of available-for-sale investment securities		94,265,000	92,395,000
Pre-delivery deposits on flight equipment, net of refunds		(153,353,000)	(169,200,000)
Capitalized interest		(9,157,000)	(7,707,000)
Assets under construction for others		(3,489,000)	(7,591,000)
Purchase of property and equipment		(345,778,000)	(114,396,000)
Net cash used in investing activities		(512,814,000)	(300,056,000)
Financing activities:
Proceeds from issuance of long-term debt		1,570,391,000	94,706,000
Proceeds from issuance of common stock and warrants		366,783,000	0
Proceeds from stock options exercised		39,000	1,000
Payments on debt obligations		(208,047,000)	(125,914,000)
Payments on finance lease obligations		(25,211,000)	(95,608,000)
Reimbursement for assets under construction for others		3,497,000	5,389,000
Repurchase of common stock		(1,597,000)	(5,356,000)
Debt and equity issuance costs		(40,156,000)	(614,000)
Net cash provided (used) by financing activities		1,665,699,000	(127,396,000)
Net increase (decrease) in cash, cash equivalents, and restricted cash		1,023,500,000	(69,055,000)
Cash and cash equivalents at beginning of period		978,957,000	1,004,733,000
Cash, cash equivalents, and restricted cash at end of period	[1]	2,002,457,000	935,678,000
Cash payments for:
Interest, net of capitalized interest		56,123,000	59,840,000
Income taxes paid (received), net		(18,659,000)	8,288,000
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases		145,934,000	141,019,000
Financing cash flows for finance leases		167,000	641,000
Non-cash transactions:
Capital expenditures funded by finance lease borrowings		565,000	96,371,000
Capital expenditures funded by operating lease borrowings		$ 127,774,000	$ 189,487,000

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