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OPERATING SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 2,897 | $ 2,838 | $ 5,129 | $ 5,034
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,960 | 1,928 | 3,793 | 3,645
Economic fuel | 615 | 573 | 1,180 | 1,238
Total Operating Expenses | 2,575 | 2,501 | 4,973 | 4,883
Nonoperating Income (Expense) |  |  |  |
Interest income | 24 | 22 | 41 | 39
Interest expense | (36) | (28) | (71) | (56)
Interest capitalized | 6 | 7 | 12 | 14
Other—net | 0 | (7) | 0 | (16)
Nonoperating Income (Expense) | (6) | (12) | (18) | (25)
Costs and Expenses, Total | $ 2,575 | $ 2,501 | $ 4,973 | $ 4,883
Pretax Margin, Adjusted | 15.80% | 18.30% | 5.80% | 8.00%
Pretax Margin, GAAP | 10.90% | 11.50% | 2.70% | 2.50%
Mileage Plan Revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 464 | $ 438 | $ 876 | $ 824
Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,897 | 2,838 | 5,129 | 5,034
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,814 | 1,742 | 3,613 | 3,395
Economic fuel | 620 | 572 | 1,198 | 1,217
Total Operating Expenses | 2,434 | 2,314 | 4,811 | 4,612
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | (6) | (6) | (18) | (19)
Income (loss) before income tax | 457 | 518 | 300 | 403
Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,417 | 2,434 | 4,257 | 4,307
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,516 | 1,468 | 3,030 | 2,858
Economic fuel | 520 | 490 | 1,005 | 1,051
Total Operating Expenses | 2,036 | 1,958 | 4,035 | 3,909
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | 6 | 3 | 3 | (3)
Income (loss) before income tax | 387 | 479 | 225 | 395
Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 477 | 401 | 867 | 723
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 322 | 279 | 621 | 535
Economic fuel | 100 | 81 | 193 | 166
Total Operating Expenses | 422 | 360 | 814 | 701
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | 0 | 0 | 0 | 0
Income (loss) before income tax | 55 | 41 | 53 | 22
Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 112 | 92 | 216 | 170
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 92 | 87 | 180 | 171
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | 92 | 87 | 180 | 171
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | (12) | (10) | (23) | (18)
Income (loss) before income tax | 8 | (5) | 13 | (19)
Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (109) | (89) | (211) | (166)
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | (116) | (92) | (218) | (169)
Economic fuel | 0 | 1 | 0 | 0
Total Operating Expenses | (116) | (91) | (218) | (169)
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | 0 | 1 | 2 | 2
Income (loss) before income tax | 7 | 3 | 9 | 5
Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 146 | 186 | 180 | 250
Economic fuel | (5) | 1 | (18) | 21
Total Operating Expenses | 141 | 187 | 162 | 271
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | 0 | (6) | 0 | (6)
Income (loss) before income tax | (141) | (193) | (162) | (277)
Passenger [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,651 | 2,598 | 4,655 | 4,582
Passenger [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,651 | 2,598 | 4,655 | 4,582
Passenger [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,188 | 2,209 | 3,817 | 3,882
Passenger [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 463 | 389 | 838 | 700
Passenger [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Passenger [Member] | Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Passenger [Member] | Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 112 | 92 | 216 | 170
Capacity Purchase Agreements [Member] | Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (112) | (92) | (216) | (170)
Capacity Purchase Agreements [Member] | Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Mileage plan other revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 174 | 170 | 338 | 324
Mileage plan other revenue [Member] | Mileage Plan Revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 174 | 170 | 338 | 324
Mileage plan other revenue [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 174 | 170 | 338 | 324
Mileage plan other revenue [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 160 | 158 | 309 | 301
Mileage plan other revenue [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 14 | 12 | 29 | 23
Mileage plan other revenue [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Mileage plan other revenue [Member] | Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Mileage plan other revenue [Member] | Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Cargo and Freight [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 72 | 70 | 136 | 128
Cargo and Freight [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 72 | 70 | 136 | 128
Cargo and Freight [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 69 | 67 | 131 | 124
Cargo and Freight [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Cargo and Freight [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Cargo and Freight [Member] | Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 3 | 3 | 5 | 4
Cargo and Freight [Member] | Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 0 | $ 0 | $ 0 | $ 0

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