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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss), Net of Tax | A rollforward of the amounts included in accumulated other comprehensive income (loss), net of taxes for the three months ended June 30, 2025 and 2024 is as follows (in millions):
| Aircraft fuel derivatives (1) |  | Available-for-sale securities |  | Total
Balance of accumulated income at March 31, 2025 | $ | — |  |  | $ | 7 |  |  | $ | 7 |
Reclassifications into earnings, net of taxes of $0 | — |  |  | (5) |  |  | (5) |
Change in fair value, net of taxes of $0 | — |  |  | 5 |  |  | 5 |
Balance of accumulated income, at June 30, 2025 | $ | — |  |  | $ | 7 |  |  | $ | 7 |
Balance of accumulated loss, at March 31, 2024 | $ | — |  |  | $ | (1) |  |  | $ | (1) |
Reclassifications into earnings, net of taxes of $1 | 2 |  |  | — |  |  | 2 |
Change in fair value, net of taxes of $0 | (2) |  |  | — |  |  | (2) |
Balance of accumulated loss, at June 30, 2024 | $ | — |  |  | $ | (1) |  |  | $ | (1) |
(1) Reclassified to aircraft fuel expense for the three months ended June 30, 2024. As of June 30, 2025 there were no outstanding fuel derivative contracts. A rollforward of the amounts included in accumulated other comprehensive income (loss), net of taxes for the six months ended June 30, 2025 and 2024 is as follows (in millions):
| Aircraft fuel derivatives (1) |  | Available-for-sale securities |  | Total
Balance of accumulated income, at December 31, 2024 | $ | — |  |  | $ | 2 |  |  | $ | 2 |
Reclassifications into earnings, net of taxes of $0 | — |  |  | (5) |  |  | (5) |
Change in fair value, net of taxes of $0 | — |  |  | 10 |  |  | 10 |
Balance of accumulated income, at June 30, 2025 | $ | — |  |  | $ | 7 |  |  | $ | 7 |
Balance of accumulated loss, at December 31, 2023 | $ | (3) |  |  | $ | (1) |  |  | $ | (4) |
Reclassifications into earnings, net of taxes of $1 | 4 |  |  | — |  |  | 4 |
Change in fair value, net of taxes of $0 | (1) |  |  | — |  |  | (1) |
Balance of accumulated loss, at June 30, 2024 | $ | — |  |  | $ | (1) |  |  | $ | (1) |
(1) Reclassified to aircraft fuel expense for the six months ended June 30, 2024. As of June 30, 2025 there were no outstanding fuel derivative contracts.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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