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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
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 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,
202520242023
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,
20252024
Flight equipment$652 $461 
Ground and other equipment191 167 
Less: accumulated depreciation(333)(252)
Total property and equipment, net$510 $376