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Debt Financing - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Aug. 31, 2023
USD ($)
aircraft
Jun. 30, 2023
USD ($)
May 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
aircraft
Oct. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
aircraft
Nov. 06, 2023
USD ($)
May 05, 2023
USD ($)
Dec. 31, 2022
USD ($)
aircraft
Debt Instrument [Line Items]                  
Outstanding balance       $ 18,833,292   $ 18,833,292     $ 18,823,429
Senior unsecured securities                  
Debt Instrument [Line Items]                  
Outstanding balance       15,944,616   15,944,616     17,095,116
Medium Term Note Program Due 2028 | Total unsecured debt financing                  
Debt Instrument [Line Items]                  
Principal amount issued       $ 700,000   $ 700,000      
Interest rate       5.30%   5.30%      
Trust Certificates Due 2028                  
Debt Instrument [Line Items]                  
Principal amount issued       $ 600,000   $ 600,000      
Interest rate       5.85%   5.85%      
Revolving credit facility                  
Debt Instrument [Line Items]                  
Outstanding balance       $ 1,778,000   $ 1,778,000     $ 1,020,000
Maximum borrowing capacity               $ 7,200,000  
Facility fee           0.20%      
Revolving credit facility | Subsequent Event                  
Debt Instrument [Line Items]                  
Increase in borrowing capacity         $ 25,000        
Revolving credit facility | Subsequent Event | Mature May 5, 2027                  
Debt Instrument [Line Items]                  
Line of credit, noncurrent             $ 6,800,000    
Revolving credit facility | Subsequent Event | Mature May 5, 2026                  
Debt Instrument [Line Items]                  
Line of credit, noncurrent             320,000    
Revolving credit facility | Subsequent Event | Mature May 5, 2025                  
Debt Instrument [Line Items]                  
Line of credit, noncurrent             32,500    
Revolving credit facility | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument [Line Items]                  
Interest margin           1.05%      
2023 Term Loan | Term financings                  
Debt Instrument [Line Items]                  
Principal amount issued     $ 650,000            
Credit spread adjustment     0.10%     0.10%      
2023 Term Loan | Term financings | Subsequent Event                  
Debt Instrument [Line Items]                  
Outstanding balance             $ 750,000    
Increase in aggregate term loan capacity         $ 100,000        
2023 Term Loan | Term financings | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument [Line Items]                  
Interest margin     1.40%            
Unsecured Note Due 2024 | Total unsecured debt financing                  
Debt Instrument [Line Items]                  
Principal amount issued       $ 150,000   $ 150,000      
Credit spread adjustment       0.10%          
Debt instrument, term       1 year          
Unsecured Note Due 2024 | Total unsecured debt financing | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument [Line Items]                  
Interest margin       1.25%          
Secured Notes Due 2034 and 2035 | Total secured debt financing                  
Debt Instrument [Line Items]                  
Number of aircraft pledged as collateral | aircraft 2                
Secured Notes Due 2034 | Total secured debt financing                  
Debt Instrument [Line Items]                  
Principal amount issued   $ 112,200              
Secured Notes Due 2034 | Total secured debt financing | 3M SOFR                  
Debt Instrument [Line Items]                  
Interest margin   0.42%              
Secured Notes Due 2035 | Total secured debt financing                  
Debt Instrument [Line Items]                  
Principal amount issued $ 101,700                
Secured Notes Due 2035 | Total secured debt financing | 3M SOFR                  
Debt Instrument [Line Items]                  
Interest margin 0.42%                
Other Debt Financings                  
Debt Instrument [Line Items]                  
Number of aircraft pledged as collateral | aircraft       4   4     3
Net book value of aircraft pledged as collateral       $ 450,500   $ 450,500     $ 212,100