The following summarizes the Company’s useful life and residual value assumptions as of December 31, 2025:

Assets

Depreciable Life

Current Residual Value

Aircraft, rotable spares, and spare engines

up to 27 years

 

up to 20

%

Ground equipment

up to 10 years

 

0

%

Office equipment

up to 5 years

0

%

Leasehold improvements

Shorter of 15 years or lease term

 

0

%

Buildings

20 - 39.5 years

 

0

%

About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.