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OPERATING SEGMENT INFORMATION (Tables) | 9 Months Ended
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Sep. 30, 2019
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment | Operating segment information is as follows (in millions):
| Three Months Ended September 30, 2019
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenues | $ | 1,850 |  |  | $ | 361 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,211 |  |  | $ | — |  |  | $ | 2,211 |
CPA revenues | — |  |  | — |  |  | 112 |  |  | (112 | ) |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 107 |  |  | 11 |  |  | — |  |  | — |  |  | 118 |  |  | — |  |  | 118 |
Cargo and other | 58 |  |  | 1 |  |  | — |  |  | 1 |  |  | 60 |  |  | — |  |  | 60 |
Total operating revenues | 2,015 |  |  | 373 |  |  | 112 |  |  | (111 | ) |  | 2,389 |  |  | — |  |  | 2,389 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 1,226 |  |  | 275 |  |  | 94 |  |  | (119 | ) |  | 1,476 |  |  | 5 |  |  | 1,481 |
Economic fuel | 411 |  |  | 75 |  |  | — |  |  | — |  |  | 486 |  |  | — |  |  | 486 |
Total operating expenses | 1,637 |  |  | 350 |  |  | 94 |  |  | (119 | ) |  | 1,962 |  |  | 5 |  |  | 1,967 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 17 |  |  | — |  |  | — |  |  | (6 | ) |  | 11 |  |  | — |  |  | 11 |
Interest expense | (18 | ) |  | — |  |  | (7 | ) |  | 7 |  |  | (18 | ) |  | — |  |  | (18 | )
Interest capitalized | 4 |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | — |  |  | 4 |
Other - net | (3 | ) |  | — |  |  | — |  |  | — |  |  | (3 | ) |  | — |  |  | (3 | )
Total nonoperating income (expense) | — |  |  | — |  |  | (7 | ) |  | 1 |  |  | (6 | ) |  | — |  |  | (6 | )
Income (loss) before income tax | $ | 378 |  |  | $ | 23 |  |  | $ | 11 |  |  | $ | 9 |  |  | $ | 421 |  |  | $ | (5 | ) |  | $ | 416 |
| Three Months Ended September 30, 2018
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenues | $ | 1,727 |  |  | $ | 316 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,043 |  |  | $ | — |  |  | $ | 2,043 |
CPA revenues | — |  |  | — |  |  | 128 |  |  | (128 | ) |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 104 |  |  | 10 |  |  | — |  |  | — |  |  | 114 |  |  | — |  |  | 114 |
Cargo and other | 53 |  |  | — |  |  | 2 |  |  | — |  |  | 55 |  |  | — |  |  | 55 |
Total operating revenues | 1,884 |  |  | 326 |  |  | 130 |  |  | (128 | ) |  | 2,212 |  |  | — |  |  | 2,212 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 1,126 |  |  | 267 |  |  | 118 |  |  | (131 | ) |  | 1,380 |  |  | 22 |  |  | 1,402 |
Economic fuel | 438 |  |  | 70 |  |  | — |  |  | — |  |  | 508 |  |  | 5 |  |  | 513 |
Total operating expenses | 1,564 |  |  | 337 |  |  | 118 |  |  | (131 | ) |  | 1,888 |  |  | 27 |  |  | 1,915 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 15 |  |  | — |  |  | — |  |  | (4 | ) |  | 11 |  |  | — |  |  | 11 |
Interest expense | (20 | ) |  | — |  |  | (6 | ) |  | 4 |  |  | (22 | ) |  | — |  |  | (22 | )
Interest capitalized | 4 |  |  | — |  |  | 1 |  |  | — |  |  | 5 |  |  | — |  |  | 5 |
Other - net | (5 | ) |  | (2 | ) |  | — |  |  | — |  |  | (7 | ) |  | — |  |  | (7 | )
Total nonoperating income (expense) | (6 | ) |  | (2 | ) |  | (5 | ) |  | — |  |  | (13 | ) |  | — |  |  | (13 | )
Income (loss) before income tax | $ | 314 |  |  | $ | (13 | ) |  | $ | 7 |  |  | $ | 3 |  |  | $ | 311 |  |  | $ | (27 | ) |  | $ | 284 |
| Nine Months Ended September 30, 2019
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenues | $ | 5,039 |  |  | $ | 999 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,038 |  |  | $ | — |  |  | $ | 6,038 |
CPA revenues | — |  |  | — |  |  | 340 |  |  | (340 | ) |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 312 |  |  | 34 |  |  | — |  |  | — |  |  | 346 |  |  | — |  |  | 346 |
Cargo and other | 163 |  |  | 2 |  |  | 1 |  |  | 3 |  |  | 169 |  |  | — |  |  | 169 |
Total operating revenues | 5,514 |  |  | 1,035 |  |  | 341 |  |  | (337 | ) |  | 6,553 |  |  | — |  |  | 6,553 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 3,545 |  |  | 817 |  |  | 286 |  |  | (353 | ) |  | 4,295 |  |  | 39 |  |  | 4,334 |
Economic fuel | 1,191 |  |  | 218 |  |  | — |  |  | — |  |  | 1,409 |  |  | (1 | ) |  | 1,408 |
Total operating expenses | 4,736 |  |  | 1,035 |  |  | 286 |  |  | (353 | ) |  | 5,704 |  |  | 38 |  |  | 5,742 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 50 |  |  | — |  |  | — |  |  | (19 | ) |  | 31 |  |  | — |  |  | 31 |
Interest expense | (58 | ) |  | — |  |  | (22 | ) |  | 20 |  |  | (60 | ) |  | — |  |  | (60 | )
Interest capitalized | 11 |  |  | — |  |  | — |  |  | — |  |  | 11 |  |  | — |  |  | 11 |
Other - net | (20 | ) |  | — |  |  | — |  |  | — |  |  | (20 | ) |  | — |  |  | (20 | )
Total nonoperating income (expense) | (17 | ) |  | — |  |  | (22 | ) |  | 1 |  |  | (38 | ) |  | — |  |  | (38 | )
Income (loss) before income tax | $ | 761 |  |  | $ | — |  |  | $ | 33 |  |  | $ | 17 |  |  | $ | 811 |  |  | $ | (38 | ) |  | $ | 773 |
| Nine Months Ended September 30, 2018
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenues | $ | 4,879 |  |  | $ | 845 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,724 |  |  | $ | — |  |  | $ | 5,724 |
CPA revenues | — |  |  | — |  |  | 375 |  |  | (375 | ) |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 301 |  |  | 28 |  |  | — |  |  | — |  |  | 329 |  |  | — |  |  | 329 |
Cargo and other | 142 |  |  | 1 |  |  | 4 |  |  | — |  |  | 147 |  |  | — |  |  | 147 |
Total operating revenues | 5,322 |  |  | 874 |  |  | 379 |  |  | (375 | ) |  | 6,200 |  |  | — |  |  | 6,200 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 3,392 |  |  | 755 |  |  | 345 |  |  | (378 | ) |  | 4,114 |  |  | 92 |  |  | 4,206 |
Economic fuel | 1,237 |  |  | 190 |  |  | — |  |  | — |  |  | 1,427 |  |  | (30 | ) |  | 1,397 |
Total operating expenses | 4,629 |  |  | 945 |  |  | 345 |  |  | (378 | ) |  | 5,541 |  |  | 62 |  |  | 5,603 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 39 |  |  | — |  |  | — |  |  | (10 | ) |  | 29 |  |  | — |  |  | 29 |
Interest expense | (64 | ) |  | — |  |  | (16 | ) |  | 9 |  |  | (71 | ) |  | — |  |  | (71 | )
Interest capitalized | 12 |  |  | — |  |  | 2 |  |  | — |  |  | 14 |  |  | — |  |  | 14 |
Other - net | (9 | ) |  | (11 | ) |  | — |  |  | — |  |  | (20 | ) |  | — |  |  | (20 | )
Total nonoperating income (expense) | (22 | ) |  | (11 | ) |  | (14 | ) |  | (1 | ) |  | (48 | ) |  | — |  |  | (48 | )
Income (loss) before income tax | $ | 671 |  |  | $ | (82 | ) |  | $ | 20 |  |  | $ | 2 |  |  | $ | 611 |  |  | $ | (62 | ) |  | $ | 549 |
(a) | Includes consolidating entries, Air Group parent company, McGee Air Services, and other immaterial business units.
(b) | The Air Group Adjusted column represents the financial information that is reviewed by management to assess performance of operations and determine capital allocations and excludes certain income and charges.
(c) | Includes merger-related costs, mark-to-market fuel-hedge accounting adjustments, and other special items.
Total assets were as follows (in millions):
| September 30, 2019 |  | December 31, 2018
Mainline | $ | 19,129 |  |  | $ | 16,853 |
Horizon | 1,231 |  |  | 1,229 |
Consolidating & Other | (7,377 | ) |  | (7,170 | )
Consolidated | $ | 12,983 |  |  | $ | 10,912 |

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