Commitments and Contingencies - Aircraft Purchase Commitments by Fleet Type (Details) - Aircraft purchase commitments	Dec. 31, 2021 aircraft
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	264
A220-100
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	4
A220-300
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	40
A321-200neo
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	155
A330-900neo
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	26
A350-900
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	20
B-737-900ER
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	19