REVENUE - Cargo and Other Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 14,239	$ 11,735	$ 10,426
Cargo and other revenue
Disaggregation of Revenue [Line Items]
Revenue	549	348	252
Passenger | Cargo and other revenue
Disaggregation of Revenue [Line Items]
Revenue	257	169	128
Other Services | Cargo and other revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 292	$ 179	$ 124