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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule Of Property Plant And Equipment The estimated useful lives of the principal asset classes are shown below.
Aircraft, engines and related rotable parts 10-25 years
Buildings and leasehold improvements10-25 years
Equipment3-10 years
Computer hardware and software3-10 years
Property and equipment consisted of the following:
As of December 31,
 (in thousands)20202019
Flight equipment$2,331,499 $2,289,157 
Computer hardware and software149,727 171,516 
Land and buildings/leasehold improvements (1)
87,030 98,885 
Other property and equipment80,601 161,760 
Total property and equipment2,648,857 2,721,318 
Less accumulated depreciation and amortization(598,546)(484,510)
Property and equipment, net$2,050,311 $2,236,808