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Consolidated Statement of Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING REVENUES:      
Passenger $ 19,141 $ 18,594 $ 18,299
Freight 173 171 179
Special revenue adjustment 0 0 172
Other 1,857 1,660 1,170
Total operating revenues 21,171 20,425 19,820
OPERATING EXPENSES:      
Salaries, wages, and benefits 7,319 6,798 6,383
Fuel and oil 3,940 3,647 3,616
Maintenance materials and repairs 1,001 1,045 1,005
Aircraft rentals 198 229 238
Landing fees and other rentals 1,292 1,211 1,166
Depreciation and amortization 1,218 1,221 1,015
Acquisition and integration 0 0 39
Other operating expenses 2,688 2,514 2,242
Total operating expenses 17,656 16,665 15,704
OPERATING INCOME 3,515 3,760 4,116
OTHER EXPENSES (INCOME):      
Interest Expense 114 122 121
Interest Costs Capitalized Adjustment (49) (47) (31)
Interest income (35) (24) (9)
Other (gains) losses, net 234 162 556
Total other expenses (income) 264 213 637
INCOME BEFORE INCOME TAXES 3,251 3,547 3,479
PROVISION FOR INCOME TAXES (237) 1,303 1,298
NET INCOME $ 3,488 $ 2,244 $ 2,181
NET INCOME PER SHARE, BASIC (in dollars per share) $ 5.80 $ 3.58 $ 3.30
NET INCOME PER SHARE, DILUTED (in dollars per share) 5.79 3.55 3.27
Cash dividends declared per common share (in dollars per share) $ 0.4750 $ 0.3750 $ 0.2850