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Commitments and contingencies - Commitments (Details)
€ in Millions
1 Months Ended 12 Months Ended
Nov. 28, 2014
aircraft
Dec. 31, 2020
aircraft
Apr. 30, 2018
aircraft
Sep. 30, 2014
aircraft
Mar. 31, 2023
EUR (€)
$ / €
aircraft
Nov. 29, 2014
aircraft
Commitments and contingencies            
Purchase obligations | €         € 4,342.0  
Boeing 737-8200            
Commitments and contingencies            
Number of aircraft agreed to purchase 10     200    
Number of aircraft, firm order       100    
Number of aircraft ordered subject to purchase options       100    
Purchase contract, term       5 years    
Number of aircraft, outstanding orders 210         210
Number of aircraft options converted to firm orders   75 25      
Number of outstanding aircraft orders, excluding orders subject to the exercise of options   210 135      
Number of outstanding aircraft orders subject to the exercise of options     75      
Number of aircraft owned         98  
Aircraft standard list price | €         € 102.5  
Basic credit as part of the purchase agreement, as a percentage of standard list price         60.00%  
Fixed exchange rate applied to obligations under purchase contract | $ / €         1.0839  
Period prior to scheduled delivery of aircraft during which entity is obliged to make advance payments         2 years  
Less than one year            
Commitments and contingencies            
Purchase obligations | €         € 2,895.0  
Later than one year and not later than two years            
Commitments and contingencies            
Purchase obligations | €         € 1,447.0