XML 53 R40.htm IDEA: XBRL DOCUMENT v3.22.0.1
Summary of Financial Statement Preparation and Significant Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]      
Restricted Cash $ 5.9 $ 0.4  
Capitalized interest 3.5 2.8 $ 3.7
Other liabilities for self-insured reserves $ 6.1 $ 9.3  
Property, Plant and Equipment Property and equipment, to be held and used, is summarized as follows (in thousands):
 
 December 31,
2021		December 31,
2020
Flight equipment$3,301,113 $2,856,142 
Ground equipment64,641 65,857 
Leasehold improvements, facilities and office equipment38,769 36,193 
Aircraft modifications and projects in progress206,917 231,451 
3,611,440 3,189,643 
Accumulated depreciation(1,481,506)(1,249,867)
Property and equipment, net$2,129,934 $1,939,776 
    
Minimum [Member] | Ground equipment [Member]      
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 2 years    
Minimum [Member] | facilities, leasehold improvements and office equipment [Member]      
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 3 years    
Maximum [Member] | Ground equipment [Member]      
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 10 years    
Maximum [Member] | facilities, leasehold improvements and office equipment [Member]      
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 25 years    
Boeing 767 and 757 aircraft and flight equipment [Member] | Minimum [Member] | Flight Equipment [Member]      
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 7 years    
Boeing 767 and 757 aircraft and flight equipment [Member] | Maximum [Member] | Flight Equipment [Member]      
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 18 years