COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) aircraft	Jan. 31, 2023
Subsequent event
Future Purchase Commitments
Employee Pay Rate Increase		18.00%
Future aircraft purchase commitments
Future Purchase Commitments
Future aircraft purchase commitments | $	$ 18,960
B-737-10
Future Purchase Commitments
Number of aircrafts ordered	100
Number of aircraft options	30
B-737-900ER
Future Purchase Commitments
Number of aircraft agreed to be acquired	4
A330-900
Future Purchase Commitments
Number of aircraft agreed to be acquired	1
A220-300
Future Purchase Commitments
Number of aircraft purchase rights exercised	24