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REVENUE (Tables) | 12 Months Ended
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Dec. 31, 2023
Revenue from Contract with Customer [Abstract] |
Disaggregation of Passenger Revenue | The following table provides the components of Passenger revenue recognized for the years ended December 31, 2023, 2022, and 2021:
|  |  | Year ended December 31,
(in millions) |  |  |  |  | 2023 |  | 2022 |  | 2021
Passenger non-loyalty |  |  |  |  | $ | 19,073 |  |  | $ | 17,645 |  |  | $ | 11,377 |
Passenger loyalty - air transportation |  |  |  |  | 3,639 |  |  | 3,028 |  |  | 2,136 |
Passenger ancillary sold separately |  |  |  |  | 925 |  |  | 735 |  |  | 553 |
Total passenger revenues |  |  |  |  | $ | 23,637 |  |  | $ | 21,408 |  |  | $ | 14,066 |
Rollforward of Air Traffic Liability | As of the years ended December 31, 2023 and 2022, the components of Air traffic liability, including contract liabilities based on tickets sold and unused flight credits available to the Customer, both of which are net of recorded breakage, and loyalty points available for redemption, within the Consolidated Balance Sheet were as follows:
| Balance as of
(in millions) | December 31, 2023 |  | December 31, 2022
Air traffic liability - passenger travel and ancillary passenger services | $ | 3,363 |  |  | $ | 3,061 |
Air traffic liability - loyalty program | 4,916 |  |  | 5,189 |
Total Air traffic liability | $ | 8,279 |  |  | $ | 8,250 |
Rollforwards of the Company's Air traffic liability - loyalty program for the years ended December 31, 2023 and 2022 were as follows (in millions):
|  |  | Year ended December 31,
|  |  |  |  | 2023 |  | 2022
Air traffic liability - loyalty program - beginning balance |  |  |  |  | $ | 5,189 |  |  | $ | 4,789 |
Amounts deferred associated with points awarded |  |  |  |  | 3,466 |  |  | 3,506 |
Revenue recognized from points redeemed - Passenger |  |  |  |  | (3,639) |  |  | (3,028) |
Revenue recognized from points redeemed - Other |  |  |  |  | (100) |  |  | (78) |
Air traffic liability - loyalty program - ending balance |  |  |  |  | $ | 4,916 |  |  | $ | 5,189 |
Air traffic liability includes consideration received for ticket and loyalty related performance obligations which have not been satisfied as of a given date. Rollforwards of the amounts included in Air traffic liability as of December 31, 2023 and 2022 were as follows (in millions):
| Air traffic liability
Balance at December 31, 2022 | $ | 8,250 |
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty) | 23,766 |
Revenue from amounts included in contract liability opening balances | (5,031) |
Revenue from current period sales | (18,706) |
Balance at December 31, 2023 | $ | 8,279 |
| Air traffic liability
Balance at December 31, 2021 | $ | 7,725 |
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty) | 22,012 |
Revenue from amounts included in contract liability opening balances | (4,976) |
Revenue from current period sales | (16,511) |
Balance at December 31, 2022 | $ | 8,250 |

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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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