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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2025
Fair Value Disclosures [Abstract] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The carrying amounts and estimated fair values of the Company’s debt are as follows (in millions):
| December 31, 2025 |  | December 31, 2024
| Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
Secured debt: |  |  |  |  |  |  |
Pre-delivery Credit Facilities | $ | 348 |  |  | $ | 352 |  |  | $ | 329 |  |  | $ | 333 |
Building notes | — |  |  | — |  |  | 12 |  |  | 12 |
2025-1 EETCs | 105 |  |  | 109 |  |  | — |  |  | — |
Unsecured debt: |  |  |  |  |  |  |
Affinity card advance purchase of miles | 101 |  |  | 100 |  |  | 100 |  |  | 98 |
PSP Promissory Notes | 66 |  |  | 65 |  |  | 66 |  |  | 62 |
Total debt | $ | 620 |  |  | $ | 626 |  |  | $ | 507 |  |  | $ | 505 |
Schedule of Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis | The tables below present disclosures about the fair value of assets and liabilities measured at fair value on a recurring basis in the Company’s consolidated financial statements (in millions):
|  |  |  | Fair Value Measurements as of December 31, 2025
Description |  | Balance Sheet Classification |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Cash, cash equivalents and restricted cash |  | Cash and cash equivalents |  | $ | 671 |  |  | $ | 671 |  |  | $ | — |  |  | $ | — |
|  |  |  | Fair Value Measurements as of December 31, 2024
Description |  | Balance Sheet Classification |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Cash, cash equivalents and restricted cash |  | Cash and cash equivalents |  | $ | 740 |  |  | $ | 740 |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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