Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 1,333,507	$ 1,789,723
Restricted cash	95,400	71,401
Short-term investment securities	106,313	106,339
Accounts receivable, net	128,828	42,940
Aircraft maintenance deposits, net	10,726	73,134
Income tax receivable	37,890	147,460
Prepaid expenses and other current assets	129,827	124,983
Total current assets	1,842,491	2,355,980
Property and equipment:
Flight equipment	4,356,523	4,177,631
Ground property and equipment	384,928	334,167
Less accumulated depreciation	(884,858)	(680,230)
Total property and equipment	3,856,593	3,831,568
Operating lease right-of-use assets	1,950,520	1,417,823
Pre-delivery deposits on flight equipment	484,821	356,262
Long-term aircraft maintenance deposits	38,166	53,158
Deferred heavy maintenance, net	330,062	347,907
Other long-term assets	37,372	36,127
Total assets	8,540,025	8,398,825
Current liabilities:
Accounts payable	44,952	28,454
Air traffic liability	382,317	401,966
Current maturities of long-term debt and finance leases	208,948	384,197
Current maturities of operating leases	158,631	133,791
Other current liabilities	480,754	393,614
Total current liabilities	1,275,602	1,342,022
Long-term debt and finance leases, less current maturities	2,975,823	3,066,635
Operating leases, less current maturities	1,751,351	1,248,519
Deferred income taxes	375,472	439,894
Deferred gains and other long-term liabilities	47,742	52,060
Shareholders’ equity:
Common stock: Common stock, $0.0001 par value, 240,000,000 shares authorized at December 31, 2021 and 2020, respectively; 110,221,939 and 99,427,203 issued and 108,429,827 and 97,689,583 outstanding as of December 31, 2021 and 2020, respectively	11	10
Additional paid-in-capital	1,131,826	799,549
Treasury stock, at cost: 1,792,112 and 1,737,620 as of December 31, 2021 and 2020, respectively	(75,639)	(74,124)
Retained earnings	1,058,369	1,524,878
Accumulated other comprehensive loss	(532)	(618)
Total shareholders’ equity	2,114,035	2,249,695
Total liabilities and shareholders’ equity	$ 8,540,025	$ 8,398,825