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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 3 Months Ended
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Mar. 31, 2024
Revenue Recognition [Abstract] |
Disaggregation of Revenue | Passenger revenue recognized in the condensed consolidated statements of operations (in millions):
| Three Months Ended March 31, |  |
| 2024 |  | 2023 |  |  |  |
Passenger ticket revenue, net of taxes and fees | $ | 1,648 |  |  | $ | 1,648 |  |  |  |  |
Passenger ancillary revenue | 108 |  |  | 104 |  |  |  |  |
Mileage Plan passenger revenue | 248 |  |  | 232 |  |  |  |  |
Total Passenger revenue | $ | 2,004 |  |  | $ | 1,984 |  |  |  |  |
Mileage Plan revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended March 31, |  |
| 2024 |  | 2023 |  |  |  |
Mileage Plan passenger revenue | $ | 248 |  |  | $ | 232 |  |  |  |  |
Mileage Plan other revenue | 164 |  |  | 154 |  |  |  |  |
Total Mileage Plan revenue | $ | 412 |  |  | $ | 386 |  |  |  |  |
Cargo and other revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended March 31, |  |
| 2024 |  | 2023 |  |  |  |
Cargo revenue | $ | 28 |  |  | $ | 29 |  |  |  |  |
Other revenue | 36 |  |  | 29 |  |  |  |  |
Total Cargo and other revenue | $ | 64 |  |  | $ | 58 |  |  |  |  |
Contract with Customer Liabilities | The table below presents a roll forward of the total frequent flyer liability (in millions):
| Three Months Ended March 31,
| 2024 |  | 2023
Total Deferred Revenue balance at January 1 | $ | 2,603 |  |  | $ | 2,497 |
Travel miles and companion certificate redemption - Passenger revenue | (234) |  |  | (218) |
Miles redeemed on partner airlines - Other revenue | (28) |  |  | (21) |
Increase in liability for mileage credits issued | 292 |  |  | 285 |
Total Deferred Revenue balance at March 31 | $ | 2,633 |  |  | $ | 2,543 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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