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Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2025
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Loss | The differences between Net income and Comprehensive income for the three and six months ended June 30, 2025 and 2024 were as follows:
| Three months ended June 30,
(in millions) | 2025 |  | 2024
NET INCOME | $ | 213 |  |  | $ | 367 |
Unrealized loss on fuel derivative instruments, net of deferred taxes of ($4) and ($3) | (12) |  |  | (10) |
Other, net of deferred taxes of $1 and $— | 1 |  |  | 2 |
Total other comprehensive loss | $ | (11) |  |  | $ | (8) |
COMPREHENSIVE INCOME | $ | 202 |  |  | $ | 359 |
| Six months ended June 30,
(in millions) | 2025 |  | 2024
NET INCOME | $ | 64 |  |  | $ | 137 |
Unrealized gain (loss) on fuel derivative instruments, net of deferred taxes of ($4) and $3 | (12) |  |  | 7 |
Other, net of deferred taxes of $1 and $— | 2 |  |  | 4 |
Total other comprehensive income (loss) | $ | (10) |  |  | $ | 11 |
COMPREHENSIVE INCOME | $ | 54 |  |  | $ | 148 |
Schedule of Rollforward of the Amounts Included in AOCI, Net of Taxes | A rollforward of the amounts included in AOCI, net of taxes, is shown below for the three and six months ended June 30, 2025:
(in millions) | Fuel derivatives |  |  |  | Defined benefit plan items |  | Other |  | Deferred tax impact |  | Accumulated other comprehensive income (loss)
Balance at March 31, 2025 | $ | (193) |  |  |  |  | $ | 167 |  |  | $ | (6) |  |  | $ | 8 |  |  | $ | (24) |
Changes in fair value | (52) |  |  |  |  | — |  |  | — |  |  | 12 |  |  | (40) |
Reclassification to earnings | 36 |  |  |  |  | — |  |  | 2 |  |  | (9) |  |  | 29 |
Balance at June 30, 2025 | $ | (209) |  |  |  |  | $ | 167 |  |  | $ | (4) |  |  | $ | 11 |  |  | $ | (35) |
(in millions) | Fuel derivatives |  | Defined benefit plan items |  | Other |  |  |  | Deferred tax impact |  | Accumulated other comprehensive income (loss)
Balance at December 31, 2024 | $ | (193) |  |  | $ | 167 |  |  | $ | (7) |  |  |  |  | $ | 8 |  |  | $ | (25) |
Changes in fair value | (90) |  |  | — |  |  | — |  |  |  |  | 21 |  |  | (69) |
Reclassification to earnings | 74 |  |  | — |  |  | 3 |  |  |  |  | (18) |  |  | 59 |
Balance at June 30, 2025 | $ | (209) |  |  | $ | 167 |  |  | $ | (4) |  |  |  |  | $ | 11 |  |  | $ | (35) |
Schedule of Reclassification out of Accumulated Other Comprehensive Loss | The following tables illustrate the significant amounts reclassified out of each component of AOCI for the three and six months ended June 30, 2025:
Three months ended June 30, 2025
(in millions) |  | Amounts reclassified from AOCI |  | Affected line item in the unaudited Condensed Consolidated Statement of Comprehensive Income
AOCI components |  |
Unrealized loss on fuel derivative instruments |  | $ | 36 |  |  | Fuel and oil expense
|  | 9 |  |  | Less: Tax expense
|  | $ | 27 |  |  | Net of tax
Other |  | $ | 2 |  |  | Other operating expenses
|  | — |  |  | Less: Tax expense
|  | $ | 2 |  |  | Net of tax
Total reclassifications for the period |  | $ | 29 |  |  | Net of tax
Six months ended June 30, 2025
(in millions) |  | Amounts reclassified from AOCI |  | Affected line item in the unaudited Condensed Consolidated Statement of Comprehensive Income
AOCI components |  |
Unrealized loss on fuel derivative instruments |  | $ | 74 |  |  | Fuel and oil expense
|  | 17 |  |  | Less: Tax expense
|  | $ | 57 |  |  | Net of tax
Other |  | $ | 3 |  |  | Other operating expenses
|  | 1 |  |  | Less: Tax expense
|  | $ | 2 |  |  | Net of tax
Total reclassifications for the period |  | $ | 59 |  |  | Net of tax

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-1 + Details
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