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REVENUE RECOGNITION (Tables) | 12 Months Ended
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Dec. 31, 2023
Revenue from Contract with Customer [Abstract] |
Schedule of disaggregation of revenue | Passenger revenue is composed of passenger ticket sales, loyalty travel awards and travel-related services performed in conjunction with a passenger’s flight.
Passenger revenue by category |  |  |
| Year Ended December 31,
(in millions) | 2023 | 2022 | 2021
Ticket | $ | 43,596 |  | $ | 35,626 |  | $ | 19,339 |
Loyalty travel awards | 3,462 |  | 2,898 |  | 1,786 |
Travel-related services | 1,851 |  | 1,694 |  | 1,394 |
Total passenger revenue | $ | 48,909 |  | $ | 40,218 |  | $ | 22,519 |
Other Revenue
| Year Ended December 31,
(in millions) | 2023 | 2022 | 2021
Refinery | $ | 3,379 |  | $ | 4,977 |  | $ | 3,229 |
Loyalty program | 3,093 |  | 2,597 |  | 1,770 |
Ancillary businesses | 840 |  | 846 |  | 793 |
Miscellaneous | 1,104 |  | 894 |  | 556 |
Total other revenue | $ | 8,416 |  | $ | 9,314 |  | $ | 6,348 |
Schedule loyalty program activity | The table below presents the activity of the current and noncurrent loyalty program deferred revenue, and includes miles earned through travel and miles sold to participating companies, which are primarily through marketing agreements.
Loyalty program activity |  |  |
(in millions) | 2023 | 2022 | 2021
Balance at January 1 | $ | 7,882 |  | $ | 7,559 |  | $ | 7,182 |
Miles earned | 4,173 |  | 3,419 |  | 2,238 |
Travel miles redeemed | (3,462) |  | (2,898) |  | (1,786) |
Non-travel miles redeemed | (173) |  | (198) |  | (75) |
Balance at December 31 | $ | 8,420 |  | $ | 7,882 |  | $ | 7,559 |
Schedule of revenue by geographic region | Our passenger and operating revenue by geographic region are summarized in the following table:
Revenue by geographic region |  |  |  |  |  |  |
| Passenger Revenue |  | Operating Revenue
| Year Ended December 31, |  | Year Ended December 31,
(in millions) | 2023 | 2022 | 2021 |  | 2023 | 2022 | 2021
Domestic | $ | 33,968 |  | $ | 30,197 |  | $ | 18,468 |  |  | $ | 40,845 |  | $ | 38,478 |  | $ | 24,320 |
Atlantic | 9,057 |  | 6,093 |  | 1,777 |  |  | 10,458 |  | 7,429 |  | 2,537 |
Latin America | 3,798 |  | 2,889 |  | 1,873 |  |  | 4,292 |  | 3,334 |  | 2,284 |
Pacific | 2,086 |  | 1,039 |  | 401 |  |  | 2,453 |  | 1,341 |  | 758 |
Total | $ | 48,909 |  | $ | 40,218 |  | $ | 22,519 |  |  | $ | 58,048 |  | $ | 50,582 |  | $ | 29,899 |

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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 revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph a -SubTopic 10 -Topic 280 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 + Details
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