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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 6 Months Ended
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Jun. 30, 2024
Revenue Recognition [Abstract] |
Disaggregation of Revenue | Passenger revenue recognized in the unaudited Condensed Consolidated Statements of Operations (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Passenger ticket revenue, net of taxes and fees | $ | 2,226 |  |  | $ | 2,207 |  |  | $ | 3,874 |  |  | $ | 3,855 |
Passenger ancillary revenue | 135 |  |  | 123 |  |  | 243 |  |  | 227 |
Mileage Plan passenger revenue | 290 |  |  | 268 |  |  | 538 |  |  | 500 |
Total Passenger revenue | $ | 2,651 |  |  | $ | 2,598 |  |  | $ | 4,655 |  |  | $ | 4,582 |
Mileage Plan revenue included in the unaudited Condensed Consolidated Statements of Operations (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Mileage Plan passenger revenue | $ | 290 |  |  | $ | 268 |  |  | $ | 538 |  |  | $ | 500 |
Mileage Plan other revenue | 174 |  |  | 170 |  |  | 338 |  |  | 324 |
Total Mileage Plan revenue | $ | 464 |  |  | $ | 438 |  |  | $ | 876 |  |  | $ | 824 |
Cargo and other revenue included in the unaudited Condensed Consolidated Statements of Operations (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Cargo revenue | $ | 36 |  |  | $ | 39 |  |  | $ | 64 |  |  | $ | 68 |
Other revenue | 36 |  |  | 31 |  |  | 72 |  |  | 60 |
Total Cargo and other revenue | $ | 72 |  |  | $ | 70 |  |  | $ | 136 |  |  | $ | 128 |
Contract with Customer Liabilities | The table below presents a roll forward of the total frequent flyer liability (in millions):
| Six Months Ended June 30,
| 2024 |  | 2023
Total Deferred Revenue balance at January 1 | $ | 2,603 |  |  | $ | 2,497 |
Travel miles and companion certificate redemption - Passenger revenue | (508) |  |  | (470) |
Miles redeemed on partner airlines - Other revenue | (67) |  |  | (52) |
Increase in liability for mileage credits issued | 613 |  |  | 602 |
Total Deferred Revenue balance at June 30 | $ | 2,641 |  |  | $ | 2,577 |

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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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