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Travelers leave the United States for Mexico as they use the Cross Border Xpress pedestrian bridge in San Diego, United States on June 8, 2017. Cross Border Xpress (CBX) is an enclosed pedestrian skywalk bridge that spans the U.S./Mexico border, connecting a passenger building in San Diego to the Tijuana International Airport (TIJ) terminal immediately south of the border. It opened on December 2015. (Photo by Bénédicte Desrus)