Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 420,831	$ 343,328
Accounts receivable, net	25,351	15,425
Deferred income taxes	18,873	20,738
Other current assets	69,421	63,217
Total current assets	534,476	442,708
Property and equipment:
Flight equipment	4,169	4,182
Ground and other equipment	49,094	46,608
Less accumulated depreciation	(28,728)	(27,580)
Total Property and equipment	24,535	23,210
Deposits on flight equipment purchase contracts	90,777	91,450
Prepaid aircraft maintenance to lessors	115,617	120,615
Security deposits and other long-term assets	79,489	67,830
Total assets	844,894	745,813
Current liabilities:
Accounts payable	24,880	15,928
Air traffic liability	155,738	112,280
Other current liabilities	117,037	98,856
Total current liabilities	297,655	227,064
Long-term deferred income taxes	15,612	12,108
Deferred credits and other long-term liabilities	40,699	39,935
Shareholders' equity:
Common stock	7	7
Additional paid-in-capital	497,396	496,136
Treasury stock	(586)	(129)
Accumulated deficit	(5,889)	(29,308)
Total shareholders' equity	490,928	466,706
Total liabilities and shareholders' equity	$ 844,894	$ 745,813