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