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OPERATING SEGMENT INFORMATION (Tables) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting [Abstract] |  |
Schedule of Segment Reporting Information, by Segment | Operating segment information is as follows (in millions):
| Three Months Ended March 31, 2021
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenues | $ | 506 |  |  | $ | 153 |  |  | $ | — |  |  | $ | — |  |  | $ | 659 |  |  | $ | — |  |  | $ | 659 |
CPA revenues | — |  |  | — |  |  | 104 |  |  | (104) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 80 |  |  | 14 |  |  | — |  |  | — |  |  | 94 |  |  | — |  |  | 94 |
Cargo and other | 44 |  |  | — |  |  | — |  |  | — |  |  | 44 |  |  | — |  |  | 44 |
Total Operating Revenues | 630 |  |  | 167 |  |  | 104 |  |  | (104) |  |  | 797 |  |  | — |  |  | 797 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 893 |  |  | 265 |  |  | 88 |  |  | (109) |  |  | 1,137 |  |  | (382) |  |  | 755 |
Economic fuel | 174 |  |  | 52 |  |  | — |  |  | (1) |  |  | 225 |  |  | (22) |  |  | 203 |
Total Operating Expenses | 1,067 |  |  | 317 |  |  | 88 |  |  | (110) |  |  | 1,362 |  |  | (404) |  |  | 958 |
Nonoperating Income (Expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 7 |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |  |  | 7 |
Interest expense | (27) |  |  | — |  |  | (5) |  |  | — |  |  | (32) |  |  | — |  |  | (32) |
Interest capitalized | 3 |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Other - net | 10 |  |  | — |  |  | — |  |  | — |  |  | 10 |  |  | — |  |  | 10 |
Total Nonoperating Income (Expense) | (7) |  |  | — |  |  | (5) |  |  | — |  |  | (12) |  |  | — |  |  | (12) |
Income (Loss) Before Income Tax | $ | (444) |  |  | $ | (150) |  |  | $ | 11 |  |  | $ | 6 |  |  | $ | (577) |  |  | $ | 404 |  |  | $ | (173) |
| Three Months Ended March 31, 2020
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenues | $ | 1,234 |  |  | $ | 247 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,481 |  |  | $ | — |  |  | $ | 1,481 |
CPA revenues | — |  |  | — |  |  | 105 |  |  | (105) |  |  | — |  |  | — |  |  | — |
Mileage Plan other revenue | 98 |  |  | 11 |  |  | — |  |  | — |  |  | 109 |  |  | — |  |  | 109 |
Cargo and other | 44 |  |  | — |  |  | — |  |  | 2 |  |  | 46 |  |  | — |  |  | 46 |
Total Operating Revenues | 1,376 |  |  | 258 |  |  | 105 |  |  | (103) |  |  | 1,636 |  |  | — |  |  | 1,636 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 1,159 |  |  | 269 |  |  | 92 |  |  | (110) |  |  | 1,410 |  |  | 163 |  |  | 1,573 |
Economic fuel | 313 |  |  | 62 |  |  | — |  |  | — |  |  | 375 |  |  | 9 |  |  | 384 |
Total Operating Expenses | 1,472 |  |  | 331 |  |  | 92 |  |  | (110) |  |  | 1,785 |  |  | 172 |  |  | 1,957 |
Nonoperating Income (Expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 14 |  |  | — |  |  | — |  |  | (5) |  |  | 9 |  |  | — |  |  | 9 |
Interest expense | (12) |  |  | — |  |  | (5) |  |  | 4 |  |  | (13) |  |  | — |  |  | (13) |
Interest capitalized | 3 |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Other - net | 6 |  |  | — |  |  | — |  |  | (1) |  |  | 5 |  |  | — |  |  | 5 |
Total Nonoperating Income (Expense) | 11 |  |  | — |  |  | (5) |  |  | (2) |  |  | 4 |  |  | — |  |  | 4 |
Income (Loss) Before Income Tax | $ | (85) |  |  | $ | (73) |  |  | $ | 8 |  |  | $ | 5 |  |  | $ | (145) |  |  | $ | (172) |  |  | $ | (317) |
(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. See Note A in the accompanying pages for further information. (c)Includes Payroll Support Program wage offsets, special items and mark-to-market fuel hedge accounting adjustments. Total assets were as follows (in millions):
| March 31, 2021 |  | December 31, 2020
Mainline | $ | 19,951 |  |  | $ | 19,754 |
Horizon | 1,200 |  |  | 1,170 |
Consolidating & Other | (6,889) |  |  | (6,878) |
Consolidated | $ | 14,262 |  |  | $ | 14,046 |
Revenues | $ 797 | $ 1,636
Income (Loss) Before Income Tax | (173) | (317)
Nonoperating Income (Expense) | (12) | 4
Interest income | 7 | 9
Interest expense | (32) | (13)
Interest Costs Capitalized | 3 | 3
Other | 10 | 5
Operating Expenses, Excluding Fuel | 755 | 1,573
Economic fuel | 203 | 384
Operating Expenses | $ 958 | $ 1,957

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