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Special Items | 6 Months Ended
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Jun. 30, 2025
Property, Plant and Equipment [Abstract] |
Special Items | Special Items The following is a listing of special items presented on our consolidated statements of operations for the three and six months ended June 30, 2025 and 2024 (in millions):
|  |  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  |  | 2025 |  | 2024 |  | 2025 |  | 2024
Special items |  |  |  |  |  |  |  |  |
Voluntary opt-out costs (1) |  |  | $ | 24 |  |  | $ | 1 |  |  | $ | 24 |  |  | $ | 16 |
Spirit-related costs (2) |  |  | — |  |  | — |  |  | — |  |  | 532 |
Embraer E190 fleet transition costs (3) |  |  | — |  |  | — |  |  | — |  |  | 15 |
Total special items |  |  | $ | 24 |  |  | $ | 1 |  |  | $ | 24 |  |  | $ | 563 |
(1) V oluntary opt-out costs for 2025 relate to severance and benefit costs associated with the Company's pilot early retirement program. Voluntary opt-out costs for 2024 relate to severance and benefit costs associated with the Company's opt-out program for eligible crewmembers in operations and support center workgroups. (2) As a result of the termination of the Merger Agreement in March 2024, we wrote off the Spirit prepayment and breakup fee. These costs also include Spirit-related consulting, professional, and legal fees. (3) Embraer E190 fleet transition costs relate to the early termination of a flight-hour engine services agreement.

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- Definition The entire disclosure for 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 -Publisher FASB -URI https://asc.fasb.org/220-20/tableOfContent + Details
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