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Commitments and contingencies - Commitments (Details)
€ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Nov. 28, 2014
aircraft
May 31, 2023
aircraft
Dec. 31, 2020
aircraft
Apr. 30, 2018
aircraft
Sep. 30, 2014
aircraft
Mar. 31, 2025
USD ($)
Mar. 31, 2025
EUR (€)
$ / €
aircraft
Boeing aircraft              
Commitments and contingencies              
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 | $ / €             1.0817
Period prior to scheduled delivery of aircraft during which entity is obliged to make advance payments           2 years  
Purchase obligations | €             € 10,288
Boeing 737-8200 aircraft              
Commitments and contingencies              
Number of aircraft agreed to purchase         200    
Number of aircraft, firm order 10       100    
Number of aircraft ordered subject to purchase options         100    
Purchase contract, term         5 years    
Number of aircraft, outstanding orders 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             176
Aircraft standard list price | $           $ 102.5  
Boeing 737-MAX-10 aircraft              
Commitments and contingencies              
Number of aircraft agreed to purchase   300          
Number of aircraft, firm order   150          
Number of aircraft ordered subject to purchase options   150          
Number of aircraft, outstanding orders   300          
Aircraft standard list price | $           $ 135.0  
Less than one year | Boeing aircraft              
Commitments and contingencies              
Purchase obligations | €             € 1,004
Later than one year and not later than two years | Boeing aircraft              
Commitments and contingencies              
Purchase obligations | €             771
Later than two years and not later than five years | Boeing aircraft              
Commitments and contingencies              
Purchase obligations | €             4,648
Later than five years | Boeing aircraft              
Commitments and contingencies              
Purchase obligations | €             € 3,865