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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2024
Accounting Policies [Abstract]  
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 LifeResidual Value
Aircraft and spare engines
25 years
10%
Flight equipment leasehold improvementsLesser of lease term or economic life0%
Aircraft rotable partsFleet life10%
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 maintenanceLesser of lease term or economic life0%
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,
202420232022
Depreciation$71 $50 $44 
Intangible amortization1 — 1 
Total depreciation and amortization$72 $50 $45 
The components of property and equipment, net are as follows (in millions):
December 31,
20242023
Flight equipment$461 $344 
Ground and other equipment167 148 
Less: accumulated depreciation(252)(183)
Total property and equipment, net$376 $309