Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Table Text Block]

The depreciable lives used for the principal depreciable asset classifications are:



		Depreciable Life

American jet aircraft and engines		20 - 30 years
Other regional aircraft and engines		16 - 20 years
Major rotable parts, avionics and assemblies		Life of equipment to which applicable
Improvements to leased flight equipment		Lesser of remaining lease term or expected useful life
Buildings and improvements (principally on leased land)		5 - 30 years or term of lease, including estimated renewal options when renewal is economically compelled at key airports
Furniture, fixtures and other equipment		3 - 10 years
Capitalized software		5 - 10 years

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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