Commitments and Contingencies - Collective Bargaining Agreements (Details)	12 Months Ended
	Dec. 31, 2023
Multiemployer Plan [Line Items]
Amount of employees represented by unions	86.00%
Pilots
Multiemployer Plan [Line Items]
Amount of employees represented by unions	29.00%
Flight Attendants
Multiemployer Plan [Line Items]
Amount of employees represented by unions	49.00%
Aircraft Technicians
Multiemployer Plan [Line Items]
Amount of employees represented by unions	6.00%
Aircraft Appearance Agents
Multiemployer Plan [Line Items]
Amount of employees represented by unions	1.00%
Dispatchers
Multiemployer Plan [Line Items]
Amount of employees represented by unions	1.00%
Material Specialists
Multiemployer Plan [Line Items]
Amount of employees represented by unions	1.00%
Maintenance Controllers
Multiemployer Plan [Line Items]
Amount of employees represented by unions	1.00%