Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 1,789,723	$ 978,957
Restricted cash	71,401	0
Short-term investment securities	106,339	105,321
Accounts receivable, net	42,940	73,807
Aircraft maintenance deposits, net	73,134	102,906
Income tax receivable	147,460	21,013
Prepaid expenses and other current assets	124,983	103,439
Total current assets	2,355,980	1,385,443
Property and equipment:
Flight equipment	4,177,631	3,730,751
Ground property and equipment	334,167	291,998
Less accumulated depreciation	(680,230)	(492,447)
Total property and equipment	3,831,568	3,530,302
Operating lease right-of-use assets	1,417,823	1,369,555
Pre-delivery deposits on flight equipment	356,262	291,930
Long-term aircraft maintenance deposits	53,158	67,682
Deferred heavy maintenance, net	347,907	361,603
Other long-term assets	36,127	36,897
Total assets	8,398,825	7,043,412
Current liabilities:
Accounts payable	28,454	43,601
Air traffic liability	401,966	315,408
Current maturities of long-term debt and finance leases	384,197	258,852
Current maturities of operating leases	133,791	120,662
Other current liabilities	393,614	373,521
Total current liabilities	1,342,022	1,112,044
Long-term debt and finance leases, less current maturities	3,066,635	1,960,453
Operating leases, less current maturities	1,248,519	1,218,014
Deferred income taxes	439,894	469,292
Deferred gains and other long-term liabilities	52,060	22,277
Shareholders’ equity:
Common stock: Common stock, $0.0001 par value, 240,000,000 shares authorized at December 31, 2020 and 2019, respectively; 99,427,203 and 70,148,386 issued and 97,689,583 and 68,455,011 outstanding as of December 31, 2020 and 2019, respectively	10	7
Additional paid-in-capital	799,549	379,380
Treasury stock, at cost: 1,737,620 and 1,693,375 as of December 31, 2020 and 2019, respectively	(74,124)	(72,455)
Retained earnings	1,524,878	1,955,187
Accumulated other comprehensive income (loss)	(618)	(787)
Total shareholders’ equity	2,249,695	2,261,332
Total liabilities and shareholders’ equity	$ 8,398,825	$ 7,043,412