Condensed Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 399,143	$ 343,328
Accounts receivable, net	23,761	15,425
Deferred income taxes	14,962	20,738
Other current assets	100,499	63,217
Total current assets	538,365	442,708
Property and equipment:
Flight equipment	4,029	4,182
Ground and other equipment	53,490	46,608
Less accumulated depreciation	(31,562)	(27,580)
Total property and equipment	25,957	23,210
Deposits on flight equipment purchase contracts	95,862	91,450
Prepaid aircraft maintenance to lessors	117,506	120,615
Security deposits and other long-term assets	106,990	67,830
Total assets	884,680	745,813
Current liabilities:
Accounts payable	21,317	15,928
Air traffic liability	136,693	112,280
Other current liabilities	109,810	98,856
Total current liabilities	267,820	227,064
Long-term deferred income taxes	28,311	12,108
Deferred credits and other long-term liabilities	29,040	39,935
Shareholders’ equity:
Common stock	7	7
Additional paid-in-capital	500,981	496,136
Treasury stock	(1,065)	(129)
Retained earnings (deficit)	59,586	(29,308)
Total shareholders' equity	559,509	466,706
Total liabilities and shareholders' equity	$ 884,680	$ 745,813