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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions	3 Months Ended
	Jun. 30, 2023 USD ($) aircraft	Mar. 31, 2023 USD ($)	Jan. 01, 2023
Future Purchase Commitments
Future aircraft purchase commitments	$ 18,500
Collective bargaining agreement term		4 years
Pilot pay rate increase			18.00%
Pilot agreement expense		$ 735
Adjustments to other benefit-related items		$ 130
A330-900
Future Purchase Commitments
Number of aircraft agreed to be acquired | aircraft	1
A220-300
Future Purchase Commitments
Number of aircraft purchase rights exercised | aircraft	12

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
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