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SPECIAL ITEMS (Tables) | 12 Months Ended
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Dec. 31, 2024
Unusual or Infrequent Items, or Both [Abstract] |
Schedule of Unusual or Infrequent Items, or Both |
(in millions) | 2024 |  | 2023 |  | 2022
Operating Expenses |  |  |  |  |
Fleet transition | $ | 11 |  |  | $ | 385 |  |  | $ | 481 |
Labor agreements | 73 |  |  | 51 |  |  | 84 |
Integration costs | 208 |  |  | 7 |  |  | — |
Litigation | 53 |  |  | — |  |  | 15 |
Special items - operating | $ | 345 |  |  | $ | 443 |  |  | $ | 580 |
Non-operating Income (Expense) |  |  |  |  |
Special items - net non-operating | $ | 16 |  |  | $ | (18) |  |  | $ | — |
(in millions) | 2024 |  | 2023
Legal and professional fees | $ | 115 |  |  |  |  | $ | 7 |  |  |
Employee-related and other merger costs | 93 |  |  |  |  | — |  |  |
Total Integration Costs | $ | 208 |  |  |  |  | $ | 7 |  |  |

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- Definition Tabular disclosure of the nature and financial statement effect of an event or transaction that is unusual in nature or infrequent in occurrence, or both. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483613/220-20-50-1 + Details
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