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Geographic Information
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Geographic Information Geographic Information
Under the Segment Reporting topic of the Codification, disclosures are required for operating segments that are regularly reviewed by chief operating decision makers. Air transportation services accounted for substantially all of the Company’s operations in 2020, 2019 and 2018.
Operating revenues are allocated to geographic regions, as defined by the Department of Transportation, or DOT, based upon the origination and destination of each flight segment. As of December 31, 2020, we served 31 locations in the Caribbean and Latin American region, or Latin America as defined by the DOT. However, our management includes our three destinations in Puerto Rico and one destination in the U.S. Virgin Islands in our Caribbean and Latin America allocation of revenues. Therefore, we have reflected these locations within the Caribbean and Latin America region in the table below. Operating revenues by geographic regions for the years ended December 31 are summarized below (in millions):
202020192018
Domestic$1,890 $5,633 $5,386 
Caribbean & Latin America1,067 2,461 2,272 
Total$2,957 $8,094 $7,658 

Our tangible assets primarily consist of our fleet of aircraft, which is deployed systemwide, with no individual aircraft dedicated to any specific route or region; therefore our assets do not require any allocation to a geographic area.