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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2019
Revenue from Contract with Customer [Abstract] |
Schedule of disaggregation of revenue | Passenger Revenue Passenger revenue is primarily composed of passenger ticket sales, loyalty travel awards and travel-related services performed in conjunction with a passenger’s flight.
| Three Months Ended March 31,
(in millions) | 2019 | 2018
Ticket | $ | 7,988 |  | $ | 7,653 |
Loyalty travel awards | 692 |  | 618 |
Travel-related services | 574 |  | 494 |
Total passenger revenue | $ | 9,254 |  | $ | 8,765 |
Other Revenue
| Three Months Ended March 31,
(in millions) | 2019 | 2018
Loyalty program | $ | 474 |  | $ | 347 |
Ancillary businesses and refinery | 369 |  | 521 |
Miscellaneous | 183 |  | 133 |
Total other revenue | $ | 1,026 |  | $ | 1,001 |
Schedule of activity in loyalty liability | The table below presents the activity of the current and noncurrent loyalty liability and includes miles earned through travel and miles sold to participating companies, which are primarily through marketing agreements.
(in millions) |  |  | 2019 | 2018
Balance at January 1 |  |  | $ | 6,641 |  | $ | 6,321 |
Mileage credits earned |  |  | 720 |  | 731 |
Travel mileage credits redeemed |  |  | (692 | ) | (618 | )
Non-travel mileage credits redeemed |  |  | (45 | ) | (40 | )
Balance at March 31 |  |  | $ | 6,624 |  | $ | 6,394 |
Schedule of revenue by geographic region | Our passenger and operating revenue by geographic region (as defined by the U.S. Department of Transportation) is summarized in the following table:
| Passenger Revenue |  | Operating Revenue
| Three Months Ended March 31, |  | Three Months Ended March 31,
(in millions) | 2019 | 2018 |  | 2019 | 2018
Domestic | $ | 6,713 |  | $ | 6,282 |  |  | $ | 7,487 |  | $ | 7,111 |
Atlantic | 1,103 |  | 1,070 |  |  | 1,316 |  | 1,253 |
Latin America | 855 |  | 830 |  |  | 964 |  | 917 |
Pacific | 583 |  | 583 |  |  | 705 |  | 687 |
Total | $ | 9,254 |  | $ | 8,765 |  |  | $ | 10,472 |  | $ | 9,968 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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