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OPERATING SEGMENT INFORMATION (Tables) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting [Abstract] |  |  |  |
Schedule of Segment Reporting Information, by Segment | Operating segment information is as follows (in millions):
| Three Months Ended June 30, 2024
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenue | $ | 2,188 |  |  | $ | 463 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,651 |  |  | $ | — |  |  | $ | 2,651 |
CPA revenue | — |  |  | — |  |  | 112 |  |  | (112) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 160 |  |  | 14 |  |  | — |  |  | — |  |  | 174 |  |  | — |  |  | 174 |
Cargo and other revenue | 69 |  |  | — |  |  | — |  |  | 3 |  |  | 72 |  |  | — |  |  | 72 |
Total Operating Revenue | 2,417 |  |  | 477 |  |  | 112 |  |  | (109) |  |  | 2,897 |  |  | — |  |  | 2,897 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 1,516 |  |  | 322 |  |  | 92 |  |  | (116) |  |  | 1,814 |  |  | 146 |  |  | 1,960 |
Fuel expense | 520 |  |  | 100 |  |  | — |  |  | — |  |  | 620 |  |  | (5) |  |  | 615 |
Total Operating Expenses | 2,036 |  |  | 422 |  |  | 92 |  |  | (116) |  |  | 2,434 |  |  | 141 |  |  | 2,575 |
Non-operating Income (Expense) | 6 |  |  | — |  |  | (12) |  |  | — |  |  | (6) |  |  | — |  |  | (6) |
Income (Loss) Before Income Tax | $ | 387 |  |  | $ | 55 |  |  | $ | 8 |  |  | $ | 7 |  |  | $ | 457 |  |  | $ | (141) |  |  | $ | 316 |
Pretax Margin |  |  |  |  |  |  |  |  | 15.8 | % |  |  |  | 10.9 | %
| Three Months Ended June 30, 2023
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenue | $ | 2,209 |  |  | $ | 389 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,598 |  |  | $ | — |  |  | $ | 2,598 |
CPA revenue | — |  |  | — |  |  | 92 |  |  | (92) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 158 |  |  | 12 |  |  | — |  |  | — |  |  | 170 |  |  | — |  |  | 170 |
Cargo and other revenue | 67 |  |  | — |  |  | — |  |  | 3 |  |  | 70 |  |  | — |  |  | 70 |
Total Operating Revenue | 2,434 |  |  | 401 |  |  | 92 |  |  | (89) |  |  | 2,838 |  |  | — |  |  | 2,838 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 1,468 |  |  | 279 |  |  | 87 |  |  | (92) |  |  | 1,742 |  |  | 186 |  |  | 1,928 |
Fuel expense | 490 |  |  | 81 |  |  | — |  |  | 1 |  |  | 572 |  |  | 1 |  |  | 573 |
Total Operating Expenses | 1,958 |  |  | 360 |  |  | 87 |  |  | (91) |  |  | 2,314 |  |  | 187 |  |  | 2,501 |
Non-operating Income (Expense) | 3 |  |  | — |  |  | (10) |  |  | 1 |  |  | (6) |  |  | (6) |  |  | (12) |
Income (Loss) Before Income Tax | $ | 479 |  |  | $ | 41 |  |  | $ | (5) |  |  | $ | 3 |  |  | $ | 518 |  |  | $ | (193) |  |  | $ | 325 |
Pretax Margin |  |  |  |  |  |  |  |  | 18.3 | % |  |  |  | 11.5 | %
| Six Months Ended June 30, 2024
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenue | $ | 3,817 |  |  | $ | 838 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,655 |  |  | $ | — |  |  | $ | 4,655 |
CPA revenue | — |  |  | — |  |  | 216 |  |  | (216) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 309 |  |  | 29 |  |  | — |  |  | — |  |  | 338 |  |  | — |  |  | 338 |
Cargo and other revenue | 131 |  |  | — |  |  | — |  |  | 5 |  |  | 136 |  |  | — |  |  | 136 |
Total Operating Revenue | 4,257 |  |  | 867 |  |  | 216 |  |  | (211) |  |  | 5,129 |  |  | — |  |  | 5,129 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 3,030 |  |  | 621 |  |  | 180 |  |  | (218) |  |  | 3,613 |  |  | 180 |  |  | 3,793 |
Fuel expense | 1,005 |  |  | 193 |  |  | — |  |  | — |  |  | 1,198 |  |  | (18) |  |  | 1,180 |
Total Operating Expenses | 4,035 |  |  | 814 |  |  | 180 |  |  | (218) |  |  | 4,811 |  |  | 162 |  |  | 4,973 |
Non-operating Income (Expense) | 3 |  |  | — |  |  | (23) |  |  | 2 |  |  | (18) |  |  | — |  |  | (18) |
Income (Loss) Before Income Tax | $ | 225 |  |  | $ | 53 |  |  | $ | 13 |  |  | $ | 9 |  |  | $ | 300 |  |  | $ | (162) |  |  | $ | 138 |
Pretax Margin |  |  |  |  |  |  |  |  | 5.8 | % |  |  |  | 2.7 | %
| Six Months Ended June 30, 2023
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenue | $ | 3,882 |  |  | $ | 700 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,582 |  |  | $ | — |  |  | $ | 4,582 |
CPA revenue | — |  |  | — |  |  | 170 |  |  | (170) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 301 |  |  | 23 |  |  | — |  |  | — |  |  | 324 |  |  | — |  |  | 324 |
Cargo and other revenue | 124 |  |  | — |  |  | — |  |  | 4 |  |  | 128 |  |  | — |  |  | 128 |
Total Operating Revenue | 4,307 |  |  | 723 |  |  | 170 |  |  | (166) |  |  | 5,034 |  |  | — |  |  | 5,034 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 2,858 |  |  | 535 |  |  | 171 |  |  | (169) |  |  | 3,395 |  |  | 250 |  |  | 3,645 |
Fuel expense | 1,051 |  |  | 166 |  |  | — |  |  | — |  |  | 1,217 |  |  | 21 |  |  | 1,238 |
Total Operating Expenses | 3,909 |  |  | 701 |  |  | 171 |  |  | (169) |  |  | 4,612 |  |  | 271 |  |  | 4,883 |
Non-operating Income (Expense) | (3) |  |  | — |  |  | (18) |  |  | 2 |  |  | (19) |  |  | (6) |  |  | (25) |
Income (Loss) Before Income Tax | $ | 395 |  |  | $ | 22 |  |  | $ | (19) |  |  | $ | 5 |  |  | $ | 403 |  |  | $ | (277) |  |  | $ | 126 |
Pretax Margin |  |  |  |  |  |  |  |  | 8.0 | % |  |  |  | 2.5 | %
Nonoperating Income (Expense) | $ (6) | $ (12) | $ (18) | $ (25)
Interest income | 24 | 22 | 41 | 39
Operating Expenses, Excluding Fuel | 1,960 | 1,928 | 3,793 | 3,645
Economic fuel | 615 | 573 | 1,180 | 1,238
Operating Expenses | 2,575 | 2,501 | 4,973 | 4,883
Income (Loss) Before Income Tax | $ 316 | $ 325 | $ 138 | $ 126
Pretax Margin, GAAP | 10.90% | 11.50% | 2.70% | 2.50%
Pretax Margin, Adjusted | 15.80% | 18.30% | 5.80% | 8.00%

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