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OPERATING SEGMENT INFORMATION (Tables) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting [Abstract] |  |  |  |
Schedule of Segment Reporting Information, by Segment | Operating segment information is as follows (in millions):
| Three Months Ended September 30, 2023
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenue | $ | 2,225 |  |  | $ | 393 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,618 |  |  | $ | — |  |  | $ | 2,618 |
CPA revenue | — |  |  | — |  |  | 104 |  |  | (104) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 146 |  |  | 13 |  |  | — |  |  | — |  |  | 159 |  |  | — |  |  | 159 |
Cargo and other revenue | 60 |  |  | — |  |  | — |  |  | 2 |  |  | 62 |  |  | — |  |  | 62 |
Total Operating Revenue | 2,431 |  |  | 406 |  |  | 104 |  |  | (102) |  |  | 2,839 |  |  | — |  |  | 2,839 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 1,484 |  |  | 297 |  |  | 89 |  |  | (92) |  |  | 1,778 |  |  | 156 |  |  | 1,934 |
Fuel expense | 621 |  |  | 108 |  |  | — |  |  | — |  |  | 729 |  |  | (35) |  |  | 694 |
Total Operating Expenses | 2,105 |  |  | 405 |  |  | 89 |  |  | (92) |  |  | 2,507 |  |  | 121 |  |  | 2,628 |
Non-operating Income (Expense) | — |  |  | — |  |  | (11) |  |  | 1 |  |  | (10) |  |  | (8) |  |  | (18) |
Income (Loss) Before Income Tax | $ | 326 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | (9) |  |  | $ | 322 |  |  | $ | (129) |  |  | $ | 193 |
Pretax Margin |  |  |  |  |  |  |  |  | 11.4 | % |  |  |  | 6.8 | %
| Three Months Ended September 30, 2022
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenue | $ | 2,217 |  |  | $ | 398 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,615 |  |  | $ | — |  |  | $ | 2,615 |
CPA revenue | — |  |  | — |  |  | 93 |  |  | (93) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 133 |  |  | 13 |  |  | — |  |  | — |  |  | 146 |  |  | — |  |  | 146 |
Cargo and other revenue | 65 |  |  | — |  |  | — |  |  | 2 |  |  | 67 |  |  | — |  |  | 67 |
Total Operating Revenue | 2,415 |  |  | 411 |  |  | 93 |  |  | (91) |  |  | 2,828 |  |  | — |  |  | 2,828 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 1,352 |  |  | 292 |  |  | 94 |  |  | (94) |  |  | 1,644 |  |  | 245 |  |  | 1,889 |
Fuel expense | 625 |  |  | 121 |  |  | — |  |  | — |  |  | 746 |  |  | 131 |  |  | 877 |
Total Operating Expenses | 1,977 |  |  | 413 |  |  | 94 |  |  | (94) |  |  | 2,390 |  |  | 376 |  |  | 2,766 |
Non-operating Income (Expense) | 8 |  |  | — |  |  | (5) |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Income (Loss) Before Income Tax | $ | 446 |  |  | $ | (2) |  |  | $ | (6) |  |  | $ | 3 |  |  | $ | 441 |  |  | $ | (376) |  |  | $ | 65 |
Pretax Margin |  |  |  |  |  |  |  |  | 15.6 | % |  |  |  | 2.3 | %
| Nine Months Ended September 30, 2023
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenue | $ | 6,143 |  |  | $ | 1,057 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,200 |  |  | $ | — |  |  | $ | 7,200 |
CPA revenue | — |  |  | — |  |  | 274 |  |  | (274) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 447 |  |  | 36 |  |  | — |  |  | — |  |  | 483 |  |  | — |  |  | 483 |
Cargo and other revenue | 184 |  |  | — |  |  | — |  |  | 6 |  |  | 190 |  |  | — |  |  | 190 |
Total Operating Revenue | 6,774 |  |  | 1,093 |  |  | 274 |  |  | (268) |  |  | 7,873 |  |  | — |  |  | 7,873 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 4,342 |  |  | 832 |  |  | 260 |  |  | (261) |  |  | 5,173 |  |  | 406 |  |  | 5,579 |
Fuel expense | 1,672 |  |  | 274 |  |  | — |  |  | — |  |  | 1,946 |  |  | (14) |  |  | 1,932 |
Total Operating Expenses | 6,014 |  |  | 1,106 |  |  | 260 |  |  | (261) |  |  | 7,119 |  |  | 392 |  |  | 7,511 |
Non-operating Income (Expense) | (3) |  |  | — |  |  | (29) |  |  | 3 |  |  | (29) |  |  | (14) |  |  | (43) |
Income (Loss) Before Income Tax | $ | 757 |  |  | $ | (13) |  |  | $ | (15) |  |  | $ | (4) |  |  | $ | 725 |  |  | $ | (406) |  |  | $ | 319 |
Pretax Margin |  |  |  |  |  |  |  |  | 9.2 | % |  |  |  | 4.1 | %
| Nine Months Ended September 30, 2022
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenue | $ | 5,488 |  |  | $ | 1,056 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,544 |  |  | $ | — |  |  | $ | 6,544 |
CPA revenue | — |  |  | — |  |  | 288 |  |  | (288) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 392 |  |  | 41 |  |  | — |  |  | — |  |  | 433 |  |  | — |  |  | 433 |
Cargo and other revenue | 186 |  |  | — |  |  | — |  |  | 4 |  |  | 190 |  |  | — |  |  | 190 |
Total Operating Revenue | 6,066 |  |  | 1,097 |  |  | 288 |  |  | (284) |  |  | 7,167 |  |  | — |  |  | 7,167 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 3,808 |  |  | 843 |  |  | 291 |  |  | (288) |  |  | 4,654 |  |  | 466 |  |  | 5,120 |
Fuel expense | 1,623 |  |  | 313 |  |  | — |  |  | — |  |  | 1,936 |  |  | 64 |  |  | 2,000 |
Total Operating Expenses | 5,431 |  |  | 1,156 |  |  | 291 |  |  | (288) |  |  | 6,590 |  |  | 530 |  |  | 7,120 |
Non-operating Income (Expense) | 12 |  |  | — |  |  | (15) |  |  | — |  |  | (3) |  |  | — |  |  | (3) |
Income (Loss) Before Income Tax | $ | 647 |  |  | $ | (59) |  |  | $ | (18) |  |  | $ | 4 |  |  | $ | 574 |  |  | $ | (530) |  |  | $ | 44 |
Pretax Margin |  |  |  |  |  |  |  |  | 8.0 | % |  |  |  | 0.6 | %
(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 allocation and excludes certain charges. (c)Includes special items and mark-to-market fuel hedge accounting adjustments.
Total assets were as follows (in millions):
| September 30, 2023 |  | December 31, 2022
Mainline | $ | 20,468 |  |  | $ | 19,733 |
Horizon | 1,320 |  |  | 1,157 |
Consolidating & Other | (6,623) |  |  | (6,704) |
Consolidated | $ | 15,165 |  |  | $ | 14,186 |
Nonoperating Income (Expense) | $ (18) | $ 3 | $ (43) | $ (3)
Interest income | 23 | 17 | 62 | 35
Operating Expenses, Excluding Fuel | 1,934 | 1,889 | 5,579 | 5,120
Economic fuel | 694 | 877 | 1,932 | 2,000
Operating Expenses | 2,628 | 2,766 | 7,511 | 7,120
Income (Loss) Before Income Tax | $ 193 | $ 65 | $ 319 | $ 44
Pretax Margin, GAAP | 6.80% | 2.30% | 4.10% | 0.60%
Pretax Margin, Adjusted | 11.40% | 15.60% | 9.20% | 8.00%

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