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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Operating Revenues |  |  |  |
Total Operating Revenues | $ 2,389 | $ 2,212 | $ 6,553 | $ 6,200
Operating Expenses |  |  |  |
Wages and benefits | 608 | 549 | 1,732 | 1,629
Variable incentive pay | 46 | 27 | 125 | 104
Aircraft fuel, including hedging gains and losses | 486 | 513 | 1,408 | 1,397
Aircraft maintenance | 106 | 107 | 341 | 320
Aircraft rent | 82 | 82 | 247 | 233
Landing fees and other rentals | 143 | 135 | 388 | 371
Contracted services | 72 | 70 | 214 | 227
Selling expenses | 77 | 79 | 236 | 245
Depreciation and amortization | 106 | 99 | 317 | 290
Food and beverage service | 57 | 53 | 159 | 158
Third-party regional carrier expense | 42 | 38 | 125 | 114
Other | 137 | 141 | 411 | 423
Special items - merger-related costs | 5 | 22 | 39 | 67
Special items—other | 0 | 0 | 0 | 25
Total Operating Expenses | 1,967 | 1,915 | 5,742 | 5,603
Operating Income | 422 | 297 | 811 | 597
Nonoperating Income (Expense) |  |  |  |
Interest income | 11 | 11 | 31 | 29
Interest expense | (18) | (22) | (60) | (71)
Interest capitalized | 4 | 5 | 11 | 14
Other—net | (3) | (7) | (20) | (20)
Nonoperating Income (Expense) Total | (6) | (13) | (38) | (48)
Income Before Income Tax | 416 | 284 | 773 | 549
Income tax expense | 94 | 67 | 185 | 135
Net Income | $ 322 | $ 217 | $ 588 | $ 414
Basic Earnings Per Share (usd per share) | $ 2.61 | $ 1.76 | $ 4.76 | $ 3.36
Diluted Earnings Per Share (usd per share) | $ 2.60 | $ 1.75 | $ 4.74 | $ 3.34
Shares used for computation: |  |  |  |
Basic shares (shares) | 123,280 | 123,224 | 123,330 | 123,216
Diluted shares (shares) | 124,067 | 123,864 | 124,051 | 123,804
Passenger Revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 2,211 | $ 2,043 | $ 6,038 | $ 5,724
Passenger Revenue [Member] | Passenger [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,211 | 2,043 | 6,038 | 5,724
Mileage Plan Revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 304 | 267 | 857 | 788
Mileage Plan Revenue [Member] | Passenger [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 186 | 153 | 511 | 459
Mileage Plan Revenue [Member] | Mileage plan other revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 118 | 114 | 346 | 329
Cargo and Other Revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 60 | 55 | 169 | 147
Cargo and Other Revenue [Member] | Cargo and Freight [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 60 | $ 55 | $ 169 | $ 147

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