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Revenue (Tables) | 3 Months Ended
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Mar. 31, 2018
Summary of Roll Forward of Frequent Flyer Deferred Revenue | The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
Total Frequent flyer deferred revenue—beginning balance |  | $ | 4,783 |  |  | $ | 4,889 |
Total miles awarded |  |  | 603 |  |  |  | 488 |
Travel miles redeemed (Passenger revenue) |  |  | (409) |  |  |  | (398) |
Non-travel miles redeemed (Other operating revenue) |  |  | (40) |  |  |  | (39) |
Total Frequent flyer deferred revenue—ending balance |  | $ | 4,937 |  |  | $ | 4,940 |
Summary of Passenger Revenue by Geographic Region and by Mainline Versus Regional | The following table presents passenger revenue by geographic region and by mainline versus regional for the three months ended March 31 (in millions):
|  | 2018 |  |  | 2017 |
Mainline |  | $ | 3,485 |  |  | $ | 3,272 |
Regional |  |  | 1,483 |  |  |  | 1,379 |
Domestic |  |  | 4,968 |  |  |  | 4,651 |
Atlantic |  |  | 1,252 |  |  |  | 1,117 |
Pacific |  |  | 1,069 |  |  |  | 1,053 |
Latin America |  |  | 860 |  |  |  | 832 |
International |  |  | 3,181 |  |  |  | 3,002 |
Consolidated |  | $ | 8,149 |  |  | $ | 7,653 |
Mainline |  |  | 6,616 |  |  |  | 6,227 |
Regional |  |  | 1,533 |  |  |  | 1,426 |
Consolidated |  | $ | 8,149 |  |  | $ | 7,653 |

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- Definition Tabular disclosure of the type of arrangements and the corresponding amounts that comprise the current and noncurrent balance of deferred revenue as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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