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Consolidated Statement of Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING REVENUES:      
Operating Revenue $ 21,965 $ 21,146 $ 20,289
OPERATING EXPENSES:      
Salaries, wages, and benefits 7,649 7,305 6,786
Fuel and oil 4,616 4,076 3,801
Maintenance materials and repairs 1,107 1,001 1,045
Landing fees and airport rentals 1,334 1,292 1,211
Depreciation and amortization 1,201 1,218 1,221
Other operating expenses 2,852 2,847 2,703
Total operating expenses 18,759 17,739 16,767
OPERATING INCOME 3,206 3,407 3,522
OTHER EXPENSES (INCOME):      
Interest Expense 131 114 122
Capitalized interest (38) (49) (47)
Interest income (69) (35) (24)
Other (gains) losses, net (18) (112) (21)
Total other expenses (income) 42 142 72
INCOME BEFORE INCOME TAXES 3,164 3,265 3,450
PROVISION (BENEFIT) FOR INCOME TAXES 699 (92) 1,267
NET INCOME 2,465 3,357 2,183
Passenger      
OPERATING REVENUES:      
Operating Revenue 20,455 19,763 19,068
Freight      
OPERATING REVENUES:      
Operating Revenue 175 173 171
Other      
OPERATING REVENUES:      
Operating Revenue $ 1,335 $ 1,210 $ 1,050