Condensed Statements Of Operations (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating revenues:
Passenger	$ 218,897	$ 180,078
Non-ticket	151,540	121,417
Total operating revenue	370,437	301,495
Operating expenses:
Aircraft fuel	131,666	108,725
Salaries, wages and benefits	61,497	52,654
Aircraft rent	41,072	32,873
Landing fees and other rents	18,056	15,114
Distribution	15,681	14,201
Maintenance, materials and repairs	11,780	9,929
Depreciation and amortization	6,324	2,870
Other operating	34,499	27,508
Loss on disposal of assets	170	449
Special charges (credits)	23	(72)
Total operating expenses	320,768	264,251
Operating income	49,669	37,244
Other (income) expense:
Interest expense	9	540
Capitalized interest	(9)	(540)
Interest income	(116)	(415)
Other expense	101	43
Total other (income) expense	(15)	(372)
Income before income taxes	49,684	37,616
Provision for income taxes	19,130	14,197
Net income	$ 30,554	$ 23,419
Basic earnings per share	$ 0.42	$ 0.32
Diluted earnings per share	$ 0.42	$ 0.32