Condensed Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 543,989	$ 530,631
Accounts receivable, net	33,915	23,246
Deferred income taxes	14,387	16,243
Prepaid expenses and other current assets	83,086	78,955
Total current assets	675,377	649,075
Property and equipment:
Flight equipment	10,657	9,847
Ground and other equipment	54,176	50,987
Less accumulated depreciation	(27,306)	(25,221)
Total property and equipment	37,527	35,613
Deposits on flight equipment purchase contracts	229,537	157,669
Aircraft maintenance deposits	171,862	161,484
Deferred heavy maintenance, net	127,774	125,288
Other long-term assets	57,178	51,636
Total assets	1,299,255	1,180,765
Current liabilities:
Accounts payable	24,741	23,104
Air traffic liability	230,068	167,627
Other current liabilities	161,172	145,262
Total current liabilities	415,981	335,993
Long-term deferred income taxes	47,469	48,916
Deferred credits and other long-term liabilities	26,428	26,739
Shareholders’ equity:
Common stock	7	7
Additional paid-in-capital	518,506	515,331
Treasury stock	(2,912)	(2,291)
Retained earnings	293,776	256,070
Total shareholders’ equity	809,377	769,117
Total liabilities and shareholders’ equity	$ 1,299,255	$ 1,180,765