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Special Charges (Credits) - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2021
aircraft
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Restructuring Cost and Reserve [Line Items]      
Government assistance received   $ 2,600,000  
Government assistance received through unsecured loans   753,000  
Government assistance received through grants   1,800,000  
Issuance of warrants   47,000  
Severance and benefit costs   417,000 $ 0
Net charges for termination of lease and utility charges related to the February winter storms in Texas   (16,000)  
Nonoperating unrealized losses on investments, net   22,000 319,000
Special charges (credits)   (1,377,000) 63,000
Nonoperating credit loss on BRW Term Loan and related guarantee   0 697,000
Gain for the change in fair value of certain derivative assets     24,000
Boeing 777-200/200ER      
Restructuring Cost and Reserve [Line Items]      
Number of aircraft temporarily grounded | aircraft 52    
Azul      
Restructuring Cost and Reserve [Line Items]      
Gain (loss) on equity securities   (23,000) 293,000
Trans States Airlines      
Restructuring Cost and Reserve [Line Items]      
Special charges (credits)     10,000
BRW | Term Loan Receivable      
Restructuring Cost and Reserve [Line Items]      
Nonoperating credit loss on BRW Term Loan and related guarantee     697,000
Routes      
Restructuring Cost and Reserve [Line Items]      
Impairment of intangible assets   50,000  
Employee Separation | Voluntary Separation Leave Programs      
Restructuring Cost and Reserve [Line Items]      
Special termination benefits related to VSL programs   46,000  
Employee Separation | Voluntary Separation Leave Programs | Full-Time Employees      
Restructuring Cost and Reserve [Line Items]      
One-time per employee contribution for special termination benefits related to VSL programs   125  
Employee Separation | Voluntary Separation Leave Programs | Part-Time Employees      
Restructuring Cost and Reserve [Line Items]      
One-time per employee contribution for special termination benefits related to VSL programs   $ 75  
Transition of Fleet Types within Other Regional Carrier Contracts      
Restructuring Cost and Reserve [Line Items]      
Special charges     $ 3,000