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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Schedule of property, plant and equipment | Estimated useful lives and residual values for property and equipment are summarized as follows:
Property and Equipment Type |  | Estimated Useful Life |  | Residual Value
Aircraft (1) |  | 25 years |  | 20 | %
Inflight entertainment systems |  | 5-10 years |  | 0 | %
Aircraft parts |  | Fleet life |  | 10 | %
Flight equipment leasehold improvements |  | Lower of lease term or economic life |  | 0 | %
Ground property and equipment |  | 2-10 years |  | 0 | %
Leasehold improvements - other |  | Lower of lease term or economic life |  | 0 | %
Buildings on leased land |  | Lease term |  | 0 | %
(1) The estimated remaining useful life of our Embraer E190 fleet ranges from 0-2 years with an average residual value of 12%. In addition, five Airbus A320 airframe were extended to an estimated useful life of between 26 to 27 years with an average residual value of $1.5 million.
Schedule of Amortization Expense | As of December 31, 2023, amortization expense related to computer software is expected to be as follows (in millions):
|  | Amortization Expense
2024 |  | $ | 57 |
2025 |  | 43 |
2026 |  | 30 |
2027 |  | 21 |
2028 |  | 5 |

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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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