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Special Charges (Credits) - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
numberOfEmployees
aircraft
Dec. 31, 2020
USD ($)
plane
Special Charges [Line Items]        
Gain on sale of assets and other special charges   $ (140,000) $ (119,000) $ (27,000)
Loss contingency, loss in period   94,000    
Loss contingency contract disputes   23,000    
Nonoperating unrealized (gains) losses on investments, net   (20,000) 34,000 194,000
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   0 438,000 575,000
Impairment of assets   0 $ 97,000 318,000
Number of aircraft and spare engines retired | aircraft     64  
Gain (loss) on net charges     $ 119,000  
Extinguishment of debt, amount   7,000 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   0 31,000 687,000
Expected credit loss allowance recorded   0 $ 0 697,000
Unsecured Debt        
Special Charges [Line Items]        
Long term debt   $ 400,000    
Fixed interest rate   4.25%    
Employee Separation | Voluntary Separation Leave Programs        
Special Charges [Line Items]        
Number of employees electing to voluntarily separate from the company | numberOfEmployees     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
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