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OPERATING SEGMENT INFORMATION (Tables) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting [Abstract] |  |
Schedule of Segment Reporting Information, by Segment | Operating segment information is as follows (in millions):
| Three Months Ended March 31, 2024
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenue | $ | 1,629 |  |  | $ | 375 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,004 |  |  | $ | — |  |  | $ | 2,004 |
CPA revenue | — |  |  | — |  |  | 104 |  |  | (104) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 149 |  |  | 15 |  |  | — |  |  | — |  |  | 164 |  |  | — |  |  | 164 |
Cargo and other revenue | 62 |  |  | — |  |  | — |  |  | 2 |  |  | 64 |  |  | — |  |  | 64 |
Total Operating Revenue | 1,840 |  |  | 390 |  |  | 104 |  |  | (102) |  |  | 2,232 |  |  | — |  |  | 2,232 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 1,514 |  |  | 299 |  |  | 88 |  |  | (102) |  |  | 1,799 |  |  | 34 |  |  | 1,833 |
Fuel expense | 485 |  |  | 93 |  |  | — |  |  | — |  |  | 578 |  |  | (13) |  |  | 565 |
Total Operating Expenses | 1,999 |  |  | 392 |  |  | 88 |  |  | (102) |  |  | 2,377 |  |  | 21 |  |  | 2,398 |
Non-operating Income (Expense) | (3) |  |  | — |  |  | (11) |  |  | 2 |  |  | (12) |  |  | — |  |  | (12) |
Income (Loss) Before Income Tax | $ | (162) |  |  | $ | (2) |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | (157) |  |  | $ | (21) |  |  | $ | (178) |
Pretax Margin |  |  |  |  |  |  |  |  | (7.0) | % |  |  |  | (8.0) | %
| Three Months Ended March 31, 2023
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenue | $ | 1,673 |  |  | $ | 311 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,984 |  |  | $ | — |  |  | $ | 1,984 |
CPA revenue | — |  |  | — |  |  | 78 |  |  | (78) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 143 |  |  | 11 |  |  | — |  |  | — |  |  | 154 |  |  | — |  |  | 154 |
Cargo and other revenue | 57 |  |  | — |  |  | — |  |  | 1 |  |  | 58 |  |  | — |  |  | 58 |
Total Operating Revenue | 1,873 |  |  | 322 |  |  | 78 |  |  | (77) |  |  | 2,196 |  |  | — |  |  | 2,196 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 1,390 |  |  | 256 |  |  | 84 |  |  | (77) |  |  | 1,653 |  |  | 64 |  |  | 1,717 |
Fuel expense | 561 |  |  | 85 |  |  | — |  |  | (1) |  |  | 645 |  |  | 20 |  |  | 665 |
Total Operating Expenses | 1,951 |  |  | 341 |  |  | 84 |  |  | (78) |  |  | 2,298 |  |  | 84 |  |  | 2,382 |
Non-operating Income (Expense) | (6) |  |  | — |  |  | (8) |  |  | 1 |  |  | (13) |  |  | — |  |  | (13) |
Income (Loss) Before Income Tax | $ | (84) |  |  | $ | (19) |  |  | $ | (14) |  |  | $ | 2 |  |  | $ | (115) |  |  | $ | (84) |  |  | $ | (199) |
Pretax Margin |  |  |  |  |  |  |  |  | (5.2) | % |  |  |  | (9.1) | %
Nonoperating Income (Expense) | $ (12) | $ (13)
Interest income | 17 | 17
Operating Expenses, Excluding Fuel | 1,833 | 1,717
Economic fuel | 565 | 665
Operating Expenses | 2,398 | 2,382
Income (Loss) Before Income Tax | $ (178) | $ (199)
Pretax Margin, GAAP | (8.00%) | (9.10%)
Pretax Margin, Adjusted | (7.00%) | (5.20%)

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