Commitments and Contingencies - Aircraft Commitments by Fleet Type (Details) (Details) - Future aircraft purchase commitments	Mar. 31, 2022 aircraft
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	243
A220-300
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	40
A321-200neo
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	154
A330-900neo
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	23
A350-900
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	18
B-737-900ER
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	5
CRJ-900
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	3