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Leases (Details) - aircraft
Dec. 31, 2019
Dec. 31, 2018
Future minimum lease payments under non cancelable operating leases    
Number Of Aircraft Variable Rate Rent 0  
Number Of Aircraft Having Purchase Options 41  
A-320-200 [Member]    
Future minimum lease payments under non cancelable operating leases    
Finance Lease, Number of Aircraft Leases 4 4
A-321-200 [Member]    
Future minimum lease payments under non cancelable operating leases    
Finance Lease, Number of Aircraft Leases 2 2
Aircraft [Domain]    
Future minimum lease payments under non cancelable operating leases    
Property Subject to or Available for Operating Lease, Number of Units 41  
Finance Lease, Number of Aircraft Leases 6  
Number of Aircraft Operated at Period End 259