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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Billions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenue from Contract with Customer [Abstract] |  |  |
Revenue recognized that was previously recorded in air traffic liability | $ 6.5 | $ 7.4 | $ 4.2
Marketing contracts initial terms, minimum (in years) | 1 year |  |
Marketing contracts initial terms, maximum (in years) | 13 years |  |
Cash sales of miles from marketing agreements | $ 7.4 | $ 6.9 | $ 5.7
Majority of new miles, redemption period (in years) | 2 years |  |

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- Definition Mileage Credit Marketing Agreement Duration, Maximum + References No definition available. + Details
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- Definition Mileage Credit Marketing Agreement Duration, Minimum + References No definition available. + Details
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- Definition Mileage Credit Redemption, Majority Of New Miles Redemption Period + References No definition available. + Details
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- Definition Sales Of Mileage Credits + References No definition available. + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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- References No definition available. + Details
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