CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Operating Revenues
Mainline	$ 887.4	$ 779.2	$ 2,409.7	$ 2,068.5
Regional	213.4	198.1	584.2	547.0
Total passenger revenue	1,100.8	977.3	2,993.9	2,615.5
Freight and mail	29.9	29.4	83.9	80.5
Other - net	67.4	61.3	195.7	177.8
Total Operating Revenues	1,198.1	1,068.0	3,273.5	2,873.8
Operating Expenses
Wages and benefits	245.1	240.2	737.2	719.1
Variable incentive pay	19.1	23.0	53.4	62.5
Aircraft fuel, including hedging gains and losses	420.1	220.9	1,012.1	683.2
Aircraft maintenance	49.9	55.3	152.3	166.1
Aircraft rent	28.8	33.9	88.3	106.3
Landing fees and other rentals	62.0	59.8	179.8	173.6
Contracted services	46.1	40.7	136.2	121.4
Selling expenses	47.4	44.3	133.0	116.1
Depreciation and amortization	62.2	57.8	184.2	172.0
Food and beverage service	17.6	15.6	49.8	42.2
Other	54.6	49.8	173.5	145.8
Fleet transition costs	2.0	9.8	38.9	13.2
Total Operating Expenses	1,054.9	851.1	2,938.7	2,521.5
Operating Income	143.2	216.9	334.8	352.3
Nonoperating Income (Expense)
Interest income	4.5	7.6	18.4	22.7
Interest expense	(25.7)	(29.5)	(69.1)	(81.4)
Interest capitalized	2.1	1.4	5.5	4.7
Other - net	1.2	1.8	3.4	4.1
Nonoperating Income (Expense) Total	(17.9)	(18.7)	(41.8)	(49.9)
Income before income tax	125.3	198.2	293.0	302.4
Income tax expense	47.8	75.8	112.5	116.1
Net Income	$ 77.5	$ 122.4	$ 180.5	$ 186.3
Basic Earnings Per Share:	$ 2.15	$ 3.41	$ 5.02	$ 5.21
Diluted Earnings Per Share:	$ 2.12	$ 3.32	$ 4.91	$ 5.08
Shares used for computation:
Basic	35,977	35,898	35,984	35,755
Diluted	36,619	36,830	36,725	36,706