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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2024
Income Tax Disclosure [Abstract] |
Schedule of Deferred Tax Assets and Liabilities | The components of deferred tax assets and liabilities as of December 31, 2024 and 2023, are as follows:
(in millions) |  | 2024 |  | 2023
DEFERRED TAX LIABILITIES: |  |  |  |
Accelerated depreciation |  | $ | 3,351 |  |  | $ | 3,595 |
Prepaid insurance |  | 282 |  |  | 258 |
Operating lease right-of-use assets |  | 314 |  |  | 276 |
Other |  | 99 |  |  | 91 |
Total deferred tax liabilities |  | 4,046 |  |  | 4,220 |
DEFERRED TAX ASSETS: |  |  |  |
Accrued employee benefits |  | 337 |  |  | 757 |
Loyalty program and flight credit liability |  | 604 |  |  | 599 |
Operating lease liabilities |  | 319 |  |  | 279 |
Net operating losses and tax credits (a) |  | 352 |  |  | 309 |
Other |  | 267 |  |  | 232 |
Total deferred tax assets |  | 1,879 |  |  | 2,176 |
Net deferred tax liability |  | $ | 2,167 |  |  | $ | 2,044 |
(a) As of December 31, 2024 and 2023, the Company had approximately $56 million and $36 million, respectively, of state net operating loss carryforwards (tax effected) to reduce future state taxable income. These state net operating loss carryforwards will expire in years 2025 through 2046 if unused. As of December 31, 2024 and 2023, the Company had $253 million and $268 million, respectively, of federal net operating loss carryforwards (tax effected) that may be carried forward indefinitely.
Schedule of Components of the Income Tax Provision | The provision (benefit) for income taxes is composed of the following:
(in millions) |  | 2024 |  | 2023 |  | 2022
CURRENT: |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | (10) |  |  | $ | (36) |
State |  | 1 |  |  | 19 |  |  | (3) |
Total current |  | 1 |  |  | 9 |  |  | (39) |
DEFERRED: |  |  |  |  |  |
Federal |  | 108 |  |  | 140 |  |  | 208 |
State |  | 24 |  |  | 19 |  |  | 20 |
Total deferred |  | 132 |  |  | 159 |  |  | 228 |
Income tax provision (benefit) |  | $ | 133 |  |  | $ | 168 |  |  | $ | 189 |
Schedule of Income Tax Provision Reconciliation To Federal Income Tax Statutory Rate | The effective tax rate on Income (loss) before income taxes differed from the federal income tax statutory rate for the following reasons:
(in millions) |  | 2024 |  | 2023 |  | 2022 |
Tax at statutory U.S. tax rates |  | $ | 126 |  |  | $ | 133 |  |  | $ | 153 |  |
State income taxes, net of federal benefit |  | 20 |  |  | 30 |  |  | 12 |  |
Nondeductible per diem |  | 9 |  |  | 8 |  |  | 1 |  |
Convertible debt repurchases |  | — |  |  | — |  |  | 31 |  |
DOT settlement |  | (3) |  |  | 22 |  |  | — |  |
Federal tax credits |  | (33) |  |  | (19) |  |  | (13) |  |
Other, net |  | 14 |  |  | (6) |  |  | 5 |  |
Total income tax provision (benefit) |  | $ | 133 |  |  | $ | 168 |  |  | $ | 189 |  |

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