Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 1,247,913	$ 1,333,507
Restricted cash	95,400	95,400
Short-term investment securities	106,013	106,313
Accounts receivable, net	160,672	128,828
Aircraft maintenance deposits, net	14,940	10,726
Income tax receivable	37,890	37,890
Prepaid expenses and other current assets	166,634	129,827
Total current assets	1,829,462	1,842,491
Property and equipment:
Flight equipment	4,382,247	4,356,523
Ground property and equipment	407,698	384,928
Less accumulated depreciation	(937,386)	(884,858)
Total property and equipment, net	3,852,559	3,856,593
Operating lease right-of-use assets	2,044,306	1,950,520
Pre-delivery deposits on flight equipment	489,214	484,821
Long-term aircraft maintenance deposits	34,796	38,166
Deferred heavy maintenance, net	324,282	330,062
Other long-term assets	37,098	37,372
Total assets	8,611,717	8,540,025
Current liabilities:
Accounts payable	47,422	44,952
Air traffic liability	558,303	382,317
Current maturities of long-term debt, net and finance leases	294,003	208,948
Current maturities of operating leases	164,814	158,631
Other current liabilities	546,733	480,754
Total current liabilities	1,611,275	1,275,602
Long-term debt, net and finance leases, less current maturities	2,801,759	2,975,823
Operating leases, less current maturities	1,835,306	1,751,351
Deferred income taxes	325,761	375,472
Deferred gains and other long-term liabilities	116,240	47,742
Shareholders’ equity:
Common stock	11	11
Additional paid-in-capital	1,135,872	1,131,826
Treasury stock, at cost	(77,411)	(75,639)
Retained earnings	863,666	1,058,369
Accumulated other comprehensive loss	(762)	(532)
Total shareholders’ equity	1,921,376	2,114,035
Total liabilities and shareholders’ equity	$ 8,611,717	$ 8,540,025