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OPERATING SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Operating Revenues |  |
Total Operating Revenues | $ 797 | $ 1,636
Operating expenses |  |
Operating Expenses, Excluding Fuel | 755 | 1,573
Economic fuel | 203 | 384
Total Operating Expenses | 958 | 1,957
Nonoperating Income (Expense) |  |
Interest income | 7 | 9
Interest expense | (32) | (13)
Interest Costs Capitalized | 3 | 3
Other | 10 | 5
Nonoperating Income (Expense) Total | (12) | 4
Income (loss) before income tax | (173) | (317)
Costs and Expenses, Total | 958 | 1,957
Interest Costs Incurred | 32 | 13
Air Group Adjusted [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 797 | 1,636
Operating expenses |  |
Operating Expenses, Excluding Fuel | 1,137 | 1,410
Economic fuel | 225 | 375
Total Operating Expenses | 1,362 | 1,785
Nonoperating Income (Expense) |  |
Interest income | 7 | 9
Interest expense | (32) | (13)
Interest Costs Capitalized | 3 | 3
Other | 10 | 5
Nonoperating Income (Expense) Total | (12) | 4
Income (loss) before income tax | (577) | (145)
Alaska Mainline [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 630 | 1,376
Operating expenses |  |
Operating Expenses, Excluding Fuel | 893 | 1,159
Economic fuel | 174 | 313
Total Operating Expenses | 1,067 | 1,472
Nonoperating Income (Expense) |  |
Interest income | 7 | 14
Interest expense | (27) | (12)
Interest Costs Capitalized | 3 | 3
Other | 10 | 6
Nonoperating Income (Expense) Total | (7) | 11
Income (loss) before income tax | (444) | (85)
Alaska Regional [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 167 | 258
Operating expenses |  |
Operating Expenses, Excluding Fuel | 265 | 269
Economic fuel | 52 | 62
Total Operating Expenses | 317 | 331
Nonoperating Income (Expense) |  |
Interest income | 0 | 0
Interest expense | 0 | 0
Interest Costs Capitalized | 0 | 0
Other | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0
Income (loss) before income tax | (150) | (73)
Horizon [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 104 | 105
Operating expenses |  |
Operating Expenses, Excluding Fuel | 88 | 92
Economic fuel | 0 | 0
Total Operating Expenses | 88 | 92
Nonoperating Income (Expense) |  |
Interest income | 0 | 0
Interest expense | (5) | (5)
Interest Costs Capitalized | 0 | 0
Other | 0 | 0
Nonoperating Income (Expense) Total | (5) | (5)
Income (loss) before income tax | 11 | 8
Consolidating and Other [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | (104) | (103)
Operating expenses |  |
Operating Expenses, Excluding Fuel | (109) | (110)
Economic fuel | (1) | 0
Total Operating Expenses | (110) | (110)
Nonoperating Income (Expense) |  |
Interest income | 0 | (5)
Interest expense | 0 | (4)
Interest Costs Capitalized | 0 | 0
Other | 0 | (1)
Nonoperating Income (Expense) Total | 0 | (2)
Income (loss) before income tax | 6 | 5
Special Charges [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Operating expenses |  |
Operating Expenses, Excluding Fuel | (382) | 163
Economic fuel | (22) | 9
Total Operating Expenses | (404) | 172
Nonoperating Income (Expense) |  |
Interest income | 0 | 0
Interest expense | 0 | 0
Interest Costs Capitalized | 0 | 0
Other | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0
Income (loss) before income tax | 404 | (172)
Passenger [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 659 | 1,481
Passenger [Member] | Air Group Adjusted [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 659 | 1,481
Passenger [Member] | Alaska Mainline [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 506 | 1,234
Passenger [Member] | Alaska Regional [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 153 | 247
Passenger [Member] | Horizon [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Passenger [Member] | Consolidating and Other [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Passenger [Member] | Special Charges [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Capacity Purchase Agreements [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Capacity Purchase Agreements [Member] | Air Group Adjusted [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Mainline [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Regional [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Capacity Purchase Agreements [Member] | Horizon [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 104 | 105
Capacity Purchase Agreements [Member] | Consolidating and Other [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | (104) | (105)
Capacity Purchase Agreements [Member] | Special Charges [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Mileage plan other revenue [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 94 | 109
Mileage plan other revenue [Member] | Air Group Adjusted [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 94 | 109
Mileage plan other revenue [Member] | Alaska Mainline [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 80 | 98
Mileage plan other revenue [Member] | Alaska Regional [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 14 | 11
Mileage plan other revenue [Member] | Horizon [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Mileage plan other revenue [Member] | Consolidating and Other [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Mileage plan other revenue [Member] | Special Charges [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Cargo and Freight [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 44 | 46
Cargo and Freight [Member] | Air Group Adjusted [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 44 | 46
Cargo and Freight [Member] | Alaska Mainline [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 44 | 44
Cargo and Freight [Member] | Alaska Regional [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Cargo and Freight [Member] | Horizon [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 0
Cargo and Freight [Member] | Consolidating and Other [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | 0 | 2
Cargo and Freight [Member] | Special Charges [Member] |  |
Operating Revenues |  |
Revenue from contract with customer, including assessed taxes | $ 0 | $ 0

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- Details
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