Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 700,900	$ 803,632
Short-term investment securities	100,155	0
Accounts receivable, net	41,136	28,266
Aircraft maintenance deposits	87,035	73,415
Prepaid income taxes	0	72,278
Prepaid expenses and other current assets	46,619	48,749
Total current assets	975,845	1,026,340
Property and equipment:
Flight equipment	1,461,525	834,927
Ground property and equipment	126,206	74,814
Less accumulated depreciation	(122,509)	(65,524)
Total property and equipment	1,465,222	844,217
Deposits on flight equipment purchase contracts	325,688	286,837
Long-term aircraft maintenance deposits	199,415	206,485
Deferred heavy maintenance, net	75,534	89,127
Other long-term assets	110,223	77,539
Total assets	3,151,927	2,530,545
Current liabilities:
Accounts payable	15,193	17,043
Air traffic liability	206,392	216,831
Current maturities of long-term debt	84,354	49,637
Other current liabilities	226,011	182,729
Total current liabilities	531,950	466,240
Long-term debt, less current maturities	897,359	596,693
Long-term deferred income taxes	308,143	221,481
Deferred gains and other long-term liabilities	19,868	20,821
Shareholders’ equity:
Common stock: Common stock, $0.0001 par value, 240,000,000 shares authorized at December 31, 2016 and 2015, respectively; 73,549,872 and 73,402,877 issued and 69,326,202 and 71,541,788 outstanding as of December 31, 2016 and 2015, respectively	7	7
Additional paid-in-capital	551,004	544,277
Treasury stock, at cost: 4,223,670 and 1,861,089 shares as of December 31, 2016 and 2015, respectively	(218,692)	(116,182)
Retained earnings	1,063,633	798,754
Accumulated other comprehensive loss	(1,345)	(1,546)
Total shareholders’ equity	1,394,607	1,225,310
Total liabilities and shareholders’ equity	$ 3,151,927	$ 2,530,545