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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2025
Accounting Policies [Abstract] |
Summary of Estimated Useful Lives and Depreciation Expense For the Company’s Property and Equipment | Estimated useful lives and residual values for the Company’s property and equipment are as follows:
| Estimated Useful Life |  | Residual Value
Aircraft and spare engines | 25 years |  | 10%
Flight equipment leasehold improvements | Lesser of lease term or economic life |  | 0%
Aircraft rotable parts | Fleet life |  | 10%
Ground property and equipment | 3 – 10 years |  | 0%
Ground equipment leasehold improvements | Lesser of lease term or 10 years |  | 0%
Internal-use software | 3 – 10 years |  | 0%
Capitalized maintenance | Lesser of lease term or economic life |  | 0%
Buildings | Lesser of 40 years or economic life |  | 10%
The components of depreciation and amortization expense are as follows (in millions):
| Year Ended December 31,
| 2025 |  | 2024 |  | 2023
Depreciation | $ | 91 |  |  | $ | 71 |  |  | $ | 50 |
Intangible amortization | — |  |  | 1 |  |  | — |
Total depreciation and amortization | $ | 91 |  |  | $ | 72 |  |  | $ | 50 |
The components of property and equipment, net are as follows (in millions):
| December 31,
| 2025 |  | 2024
Flight equipment | $ | 652 |  |  | $ | 461 |
Ground and other equipment | 191 |  |  | 167 |
Less: accumulated depreciation | (333) |  |  | (252) |
Total property and equipment, net | $ | 510 |  |  | $ | 376 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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