Condensed Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 935,678	$ 1,004,733
Short-term investment securities	104,792	102,789
Accounts receivable, net	71,372	47,660
Aircraft maintenance deposits, net	132,842	106,901
Income tax receivable	21,693	0
Prepaid expenses and other current assets	136,905	83,383
Total current assets	1,403,282	1,345,466
Property and equipment:
Flight equipment	3,549,087	3,257,215
Ground property and equipment	234,740	191,661
Less accumulated depreciation	(450,195)	(332,864)
Total property and equipment	3,333,632	3,116,012
Operating lease right-of-use assets	1,059,766	0
Pre-delivery deposits on flight equipment	330,951	236,775
Long-term aircraft maintenance deposits	79,361	138,738
Deferred heavy maintenance, net	328,109	249,010
Other long-term assets	40,113	79,456
Total assets	6,575,214	5,165,457
Current liabilities:
Accounts payable	41,915	39,320
Air traffic liability	361,218	291,981
Current maturities of long-term debt and finance leases	194,582	163,557
Current maturities of operating leases	117,376	0
Other current liabilities	337,685	339,677
Total current liabilities	1,052,776	834,535
Long-term debt and finance leases, less current maturities	1,968,901	2,024,774
Operating leases, less current maturities	915,977	0
Deferred income taxes	446,940	355,141
Deferred gains and other long-term liabilities	10,533	22,503
Shareholders’ equity:
Common stock	7	7
Additional paid-in-capital	379,354	371,225
Treasury stock, at cost	(72,372)	(67,016)
Retained earnings	1,873,973	1,625,481
Accumulated other comprehensive income (loss)	(875)	(1,193)
Total shareholders’ equity	2,180,087	1,928,504
Total liabilities and shareholders’ equity	$ 6,575,214	$ 5,165,457