CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Revenues
Passenger, Mainline	$ 763.7	$ 702.4
Passenger, Regional	186.7	176.5
Total passenger revenue	950.4	878.9
Freight and mail	24.4	24.9
Other - net	64.5	61.4
Total Operating Revenues	1,039.3	965.2
Operating Expenses
Wages and benefits	256.6	249.3
Variable incentive pay	16.0	16.4
Aircraft fuel, including hedging gains and losses	318.8	194.5
Aircraft maintenance	50.1	53.3
Aircraft rent	28.0	30.5
Landing fees and other rentals	62.5	57.9
Contracted services	47.7	43.5
Selling expenses	41.1	39.8
Depreciation and amortization	63.7	60.3
Food and beverage service	17.8	15.1
Other	64.6	60.7
Fleet transition expenses	0	10.1
Total Operating Expenses	966.9	831.4
Operating Income	72.4	133.8
Nonoperating income (expense)
Interest income	4.9	7.6
Interest expense	(16.6)	(23.4)
Interest capitalized	4.5	1.8
Other - net	1.4	0.9
Nonoperating Income (Expense) Total	(5.8)	(13.1)
Income before income tax	66.6	120.7
Income tax expense	25.8	46.5
Net Income	$ 40.8	$ 74.2
Basic Earnings Per Share	$ 0.57	$ 1.03
Diluted Earnings Per Share	$ 0.56	$ 1.01
Shares used for computation:
Basic	71,192	71,988
Diluted	72,659	73,682