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OPERATING SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating revenues |  |  |  |
Total Operating Revenues |  | $ 10,426 | $ 9,646 | $ 6,176
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | 7,391 | 6,908 | 4,212
Economic fuel |  | 2,641 | 2,668 | 1,279
Total Operating Expenses |  | 10,032 | 9,576 | 5,491
Nonoperating Income (Expense) [Abstract] |  |  |  |
Investment Income, Interest |  | 80 | 53 | 25
Interest Expense |  | (121) | (108) | (128)
Interest Costs Capitalized Adjustment |  | 27 | 14 | 11
Other - net |  | (39) | 50 | 36
Nonoperating Income (Expense) Total |  | (71) | 9 | (56)
Income before income tax |  | 323 | 79 | 629
Depreciation |  | 451 | 415 | 394
Payments to Acquire Property, Plant, and Equipment (including non-cash) |  | 1,673 | 1,671 | $ 292
Total assets |  | $ 14,613 | $ 14,186 |
Pretax Margin, Adjusted |  | 7.50% | 7.60% | (5.60%)
Pretax Margin, GAAP |  | 3.10% | 0.80% | 10.20%
Air Group Adjusted [Member] |  |  |  |
Operating revenues |  |  |  |
Total Operating Revenues |  | $ 10,426 | $ 9,646 | $ 6,176
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | 6,948 | 6,328 | 5,137
Economic fuel |  | 2,643 | 2,592 | 1,326
Total Operating Expenses |  | 9,591 | 8,920 | 6,463
Nonoperating Income (Expense) [Abstract] |  |  |  |
Nonoperating Income (Expense) Total |  | (53) | 9 | (56)
Income before income tax |  | 782 | 735 | (343)
Horizon [Member] |  |  |  |
Operating revenues |  |  |  |
Total Operating Revenues |  | 374 | 359 | 406
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | 344 | 383 | 373
Economic fuel |  | 0 | 0 | 0
Total Operating Expenses |  | 344 | 383 | 373
Nonoperating Income (Expense) [Abstract] |  |  |  |
Nonoperating Income (Expense) Total |  | (41) | (22) | (21)
Income before income tax |  | (11) | (46) | 12
Depreciation |  | 48 | 64 | 71
Payments to Acquire Property, Plant, and Equipment (including non-cash) |  | 200 | 127 | 56
Total assets |  | 1,352 | 1,157 |
Consolidating & Other |  |  |  |
Operating revenues |  |  |  |
Total Operating Revenues |  | (366) | (355) | (402)
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | (358) | (356) | (433)
Economic fuel |  | 0 | 0 | 0
Total Operating Expenses |  | (358) | (356) | (433)
Nonoperating Income (Expense) [Abstract] |  |  |  |
Nonoperating Income (Expense) Total |  | 3 | 1 | 3
Income before income tax |  | (5) | 2 | 34
Total assets |  | (6,676) | (6,704) |
Special Charges [Member] |  |  |  |
Operating revenues |  |  |  |
Total Operating Revenues |  | 0 | 0 | 0
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | 443 | 580 | (925)
Economic fuel |  | (2) | 76 | (47)
Total Operating Expenses |  | 441 | 656 | (972)
Nonoperating Income (Expense) [Abstract] |  |  |  |
Nonoperating Income (Expense) Total |  | (18) | 0 | 0
Income before income tax |  | (459) | (656) | 972
Alaska Mainline [Member] |  |  |  |
Operating revenues |  |  |  |
Total Operating Revenues |  | 8,940 | 8,236 | 5,025
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | 5,841 | 5,216 | 4,101
Economic fuel |  | 2,264 | 2,195 | 1,065
Total Operating Expenses |  | 8,105 | 7,411 | 5,166
Nonoperating Income (Expense) [Abstract] |  |  |  |
Nonoperating Income (Expense) Total |  | (15) | 30 | (38)
Income before income tax |  | 820 | 855 | (179)
Depreciation | [1] | 403 | 351 | 323
Payments to Acquire Property, Plant, and Equipment (including non-cash) | [1] | 1,473 | 1,544 | 236
Total assets | [1] | 19,937 | 19,733 |
Alaska Regional [Member] |  |  |  |
Operating revenues |  |  |  |
Total Operating Revenues |  | 1,478 | 1,406 | 1,147
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | 1,121 | 1,085 | 1,096
Economic fuel |  | 379 | 397 | 261
Total Operating Expenses |  | 1,500 | 1,482 | 1,357
Nonoperating Income (Expense) [Abstract] |  |  |  |
Nonoperating Income (Expense) Total |  | 0 | 0 | 0
Income before income tax |  | (22) | (76) | (210)
Passenger Revenue [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 9,526 | 8,808 | 5,499
Passenger Revenue [Member] | Air Group Adjusted [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 9,526 | 8,808 | 5,499
Passenger Revenue [Member] | Horizon [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Passenger Revenue [Member] | Consolidating & Other |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Passenger Revenue [Member] | Special Charges [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Passenger Revenue [Member] | Alaska Mainline [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 8,097 | 7,454 | 4,411
Passenger Revenue [Member] | Alaska Regional [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,429 | 1,354 | 1,088
Capacity Purchase Agreements [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Air Group Adjusted [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Horizon [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 374 | 359 | 406
Capacity Purchase Agreements [Member] | Consolidating & Other |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | (374) | (359) | (406)
Capacity Purchase Agreements [Member] | Special Charges [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Mainline [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Regional [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Mileage Plan Services, Other [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 648 | 590 | 461
Mileage Plan Services, Other [Member] | Air Group Adjusted [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 648 | 590 | 461
Mileage Plan Services, Other [Member] | Horizon [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Mileage Plan Services, Other [Member] | Consolidating & Other |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Mileage Plan Services, Other [Member] | Special Charges [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Mileage Plan Services, Other [Member] | Alaska Mainline [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 599 | 538 | 402
Mileage Plan Services, Other [Member] | Alaska Regional [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 49 | 52 | 59
Cargo and Freight [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 252 | 248 | 216
Cargo and Freight [Member] | Air Group Adjusted [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 252 | 248 | 216
Cargo and Freight [Member] | Horizon [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Cargo and Freight [Member] | Consolidating & Other |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 8 | 4 | 4
Cargo and Freight [Member] | Special Charges [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0
Cargo and Freight [Member] | Alaska Mainline [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 244 | 244 | 212
Cargo and Freight [Member] | Alaska Regional [Member] |  |  |  |
Operating revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | $ 0 | $ 0 | $ 0
[1] | NOTE 8. INCOME TAXES Deferred Income Taxes Deferred income taxes reflect the impact of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and such amounts for tax purposes. The Company has a net deferred tax liability, primarily due to differences in depreciation rates for federal income tax purposes and for financial reporting purposes. Deferred tax (assets) and liabilities comprise the following (in millions):
| 2023 |  | 2022
Excess of tax over book depreciation | $ | 1,605 |  |  | $ | 1,312 |
Intangibles - net | 16 |  |  | 17 |
Operating lease assets | 292 |  |  | 356 |
Other - net | 3 |  |  | 49 |
Deferred tax liabilities | 1,916 |  |  | 1,734 |
Mileage Plan | (455) |  |  | (436) |
Inventory obsolescence | (23) |  |  | (21) |
Employee benefits | (159) |  |  | (145) |
Net operating losses | (166) |  |  | (28) |
Operating lease liabilities | (329) |  |  | (392) |
Leasehold maintenance | (28) |  |  | (67) |
Other - net | (77) |  |  | (88) |
Deferred tax assets | (1,237) |  |  | (1,177) |
Valuation allowance | 16 |  |  | 17 |
Net deferred tax liabilities | $ | 695 |  |  | $ | 574 |
At December 31, 2023, the Company has paid taxes of $16 million and does not expect to pay any additional tax for 2023. The Company is also awaiting payment of a $4 million federal tax refund receivable as a result of carrying back capital losses and credits to previous tax years. The Company also has gross state and local NOLs of approximately $467 million that expire beginning in 2025 and continuing through 2043. Current federal NOLs in the amount of $684 million will be carried forward and have an indefinite life. Valuation allowances are provided to reduce the related deferred income tax assets to an amount which will, more likely than not, be realized. The Company has determined it is more likely than not that a portion of the federal capital loss carryforward and state NOL carryforward will not be realized and, therefore has provided a valuation allowance of $16 million for that portion as of December 31, 2023. The Company has likewise concluded it is more likely than not that all of its federal and the remaining state deferred income tax assets will be realized and thus no additional valuation allowance has been recorded. The Company reassesses the need for a valuation allowance each reporting period. Components of Income Tax Expense The components of income tax expense are as follows (in millions):
| 2023 |  | 2022 |  | 2021
Current income tax (benefit) expense: |  |  |  |  |
Federal | $ | (3) |  |  | $ | (11) |  |  | $ | 40 |
State | (4) |  |  | (3) |  |  | 16 |
Total current income tax (benefit) expense | (7) |  |  | (14) |  |  | 56 |
Deferred income tax expense: |  |  |  |  |
Federal | 82 |  |  | 32 |  |  | 80 |
State | 13 |  |  | 3 |  |  | 15 |
Total deferred income tax expense | 95 |  |  | 35 |  |  | 95 |
Income tax expense | $ | 88 |  |  | $ | 21 |  |  | $ | 151 |
Income Tax Rate Reconciliation Income tax expense reconciles to the amount computed by applying the 2023 U.S. federal rate of 21% to income before income tax and for deferred taxes as follows (in millions):
| 2023 |  | 2022 |  | 2021
Income before income tax | $ | 323 |  |  | $ | 79 |  |  | $ | 629 |
Expected tax expense | 68 |  |  | 17 |  |  | 132 |
Nondeductible expenses | 14 |  |  | 11 |  |  | 10 |
State income tax expense | 17 |  |  | 5 |  |  | 20 |
Tax law changes | — |  |  | — |  |  | (14) |
State income sourcing | (5) |  |  | (2) |  |  | — |
Valuation allowance | (1) |  |  | (4) |  |  | 1 |
Tax credits | (3) |  |  | (5) |  |  | (2) |
Uncertain tax positions | (5) |  |  | (1) |  |  | 3 |
Other - net | 3 |  |  | — |  |  | 1 |
Actual tax expense | $ | 88 |  |  | $ | 21 |  |  | $ | 151 |
Effective tax rate(a) | 27.1 | % |  | 26.2 | % |  | 24.0 | %
(a) Figures in the table above are rounded to the nearest million. As a result, a manual recalculation of the effective tax rate using these rounded figures may not agree directly to the Company's actual effective tax rate shown in the table. Uncertain Tax Positions The Company has identified its federal tax return and its state tax returns in Alaska, Oregon and California as “major” tax jurisdictions. A summary of the Company's jurisdictions and the periods that are subject to examination are as follows:
Jurisdiction | Period
Federal | 2020 to 2022
Alaska | 2018 to 2022
California | 2007 to 2022
Oregon | 2015 to 2022
Certain tax years are open to the extent of net operating loss carryforwards. Changes in the liability for gross unrecognized tax benefits during 2023, 2022 and 2021 are as follows (in millions):
| 2023 |  | 2022 |  | 2021
Balance at January 1 | $ | 21 |  |  | $ | 41 |  |  | $ | 35 |
Additions related to prior years | — |  |  | — |  |  | 3 |
Releases related to prior years | — |  |  | (1) |  |  | — |
Additions related to current year activity | 9 |  |  | 1 |  |  | 3 |
Releases due to settlements | (3) |  |  | (20) |  |  | — |
Releases due to lapse of statute of limitations | (2) |  |  | — |  |  | — |
Balance at December 31 | $ | 25 |  |  | $ | 21 |  |  | $ | 41 |
As of December 31, 2023, the Company had $25 million of accrued tax contingencies, of which $20 million, if fully recognized, would decrease the effective tax rate. As of December 31, 2023, 2022 and 2021, the Company has accrued interest and penalties, net of federal income tax benefit, of $2 million, $3 million, and $8 million. In 2023, 2022, and 2021, the Company recognized an immaterial benefit, a benefit of $5 million, and expense of $2 million for interest and penalties, net of federal income tax benefit. At December 31, 2023, the Company has unrecognized tax benefits recorded as a liability. These uncertain tax positions could change because of the Company's ongoing audits, settlement of issues, new audits, and status of other taxpayer court cases. The Company cannot predict the timing of these actions.

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