Condensed Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 483,484	$ 416,816
Accounts receivable, net	24,616	22,740
Deferred income taxes	12,874	12,591
Other current assets	84,156	95,210
Total current assets	605,130	547,357
Property and equipment:
Flight equipment	4,289	2,648
Ground and other equipment	45,715	43,580
Less accumulated depreciation	(19,595)	(17,825)
Total property and equipment	30,409	28,403
Deposits on flight equipment purchase contracts	109,719	96,692
Aircraft maintenance deposits	137,239	122,379
Deferred heavy maintenance	91,371	80,533
Other long-term assets	45,884	44,520
Total assets	1,019,752	919,884
Current liabilities:
Accounts payable	17,527	24,166
Air traffic liability	175,803	131,414
Other current liabilities	149,933	121,314
Total current liabilities	343,263	276,894
Long-term deferred income taxes	36,031	33,216
Deferred credits and other long-term liabilities	25,659	27,239
Shareholders’ equity:
Common stock	7	7
Additional paid-in-capital	506,558	504,527
Treasury stock	(1,472)	(1,151)
Retained earnings	109,706	79,152
Total shareholders’ equity	614,799	582,535
Total liabilities and shareholders’ equity	$ 1,019,752	$ 919,884