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Special Charges (Credits) and Unrealized (Gains) Losses on Investments - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
employee
aircraft
Dec. 31, 2020
USD ($)
plane
Dec. 31, 2019
USD ($)
Special Charges [Line Items]        
Cash received under the Payroll Support Program   $ 5,800,000 $ 5,100,000  
Proceeds from the issuance of an unsecured loan   1,700,000 1,500,000  
Proceeds from issuance of warrants     66,000  
Severance and benefit expenses   438,000 575,000 $ 16,000
Impairment of assets   $ 97,000 318,000 171,000
Number of aircraft and spare engines retired | aircraft   64    
Gain (loss) on net charges   $ 119,000    
Nonoperating unrealized (gains) losses on investments, net   34,000 194,000 (153,000)
Extinguishment of debt, amount   50,000    
Grant income     3,600,000  
Impairment of right-of-use assets     38,000  
Impairments related to cancelled projects     56,000  
Settlement losses related to defined benefit pension plans   31,000 687,000 0
Expected credit loss allowance recorded   $ 0 697,000 0
Write-off of unexercised aircraft purchase       18,000
Other miscellaneous impairments       20,000
Charges related to contract terminations       25,000
Charges for the settlement of certain legal matters       18,000
Fleet type transaction costs       14,000
Other charges       2,000
Employee Separation | Voluntary Separation Leave Programs        
Special Charges [Line Items]        
Number of employees electing to voluntarily separate from the company | employee   4,500    
Special termination benefits   $ 31,000    
Employee Separation | Voluntary Separation Leave Programs | Full-Time Employees        
Special Charges [Line Items]        
Restructuring programs, one-time contribution per employee $ 125 125    
Employee Separation | Voluntary Separation Leave Programs | Part-Time Employees        
Special Charges [Line Items]        
Restructuring programs, one-time contribution per employee $ 75 75    
Payroll Support Program 2 & 3 (PSP 2 & 3) Warrants        
Special Charges [Line Items]        
Proceeds from issuance of warrants   99,000    
Payroll Support Program 2 and 3 (PSP 2 & 3) Note        
Special Charges [Line Items]        
Grant Income   4,000,000 3,500,000  
International Brotherhood of Teamsters        
Special Charges [Line Items]        
Severance and benefit expenses       2,000
Management        
Special Charges [Line Items]        
Severance and benefit expenses       14,000
Aircraft Engines        
Special Charges [Line Items]        
Tangible asset impairment charges       43,000
Hong Kong Routes        
Special Charges [Line Items]        
Intangible assets impairment charges       $ 90,000
Airbus A319 & Boeing 737-700        
Special Charges [Line Items]        
Impairment of assets   $ 61,000    
Airbus A319        
Special Charges [Line Items]        
Number of aircraft held for sale | aircraft   13    
Boeing 737-700        
Special Charges [Line Items]        
Number of aircraft held for sale | aircraft   13    
Embraer EMB 145LR        
Special Charges [Line Items]        
Impairment of assets   $ 36,000    
Boeing 757-200        
Special Charges [Line Items]        
Tangible asset impairment charges     $ 94,000  
Number of planes permanently grounded | plane     11  
Routes        
Special Charges [Line Items]        
Intangible assets impairment charges     $ 130,000