Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 978,957	$ 1,004,733
Short-term investment securities	105,321	102,789
Accounts receivable, net	73,807	47,660
Aircraft maintenance deposits, net	102,906	106,901
Income tax receivable	21,013	0
Prepaid expenses and other current assets	103,439	83,383
Total current assets	1,385,443	1,345,466
Property and equipment:
Flight equipment	3,730,751	3,257,215
Ground property and equipment	291,998	191,661
Less accumulated depreciation	(492,447)	(332,864)
Total property and equipment	3,530,302	3,116,012
Operating lease right-of-use assets	1,369,555	0
Pre-delivery deposits on flight equipment	291,930	236,775
Long-term aircraft maintenance deposits	67,682	138,738
Deferred heavy maintenance, net	361,603	249,010
Other long-term assets	36,897	79,456
Total assets	7,043,412	5,165,457
Current liabilities:
Accounts payable	43,601	39,320
Air traffic liability	315,408	291,981
Current maturities of long-term debt and finance leases	258,852	163,557
Current maturities of operating leases	120,662	0
Other current liabilities	373,521	339,677
Total current liabilities	1,112,044	834,535
Long-term debt and finance leases, less current maturities	1,960,453	2,024,774
Operating leases, less current maturities	1,218,014	0
Deferred income taxes	469,292	355,141
Deferred gains and other long-term liabilities	22,277	22,503
Shareholders’ equity:
Common stock: Common stock, $0.0001 par value, 240,000,000 shares authorized at December 31, 2019 and 2018, respectively; 70,148,386 and 69,871,535 issued and 68,455,011 and 68,269,567 outstanding as of December 31, 2019 and 2018, respectively	7	7
Additional paid-in-capital	379,380	371,225
Treasury stock, at cost: 1,693,375 and 1,601,968 as of December 31, 2019 and 2018, respectively	(72,455)	(67,016)
Retained earnings	1,955,187	1,625,481
Accumulated other comprehensive income (loss)	(787)	(1,193)
Total shareholders’ equity	2,261,332	1,928,504
Total liabilities and shareholders’ equity	$ 7,043,412	$ 5,165,457