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Travelers walk through the Salt Lake City International Airport Wednesday, March 17, 2021, in Salt Lake City. Airlines and others in the travel industry are throwing their support behind vaccine passports to boost pandemic-depressed travel, and authorities in Europe could embrace the idea quickly enough for the peak summer vacation season.   (AP Photo/Rick Bowmer)

Travelers walk through the Salt Lake City International Airport Wednesday, March 17, 2021, in Salt Lake City. Airlines and others in the travel industry are throwing their support behind vaccine passports to boost pandemic-depressed travel, and authorities in Europe could embrace the idea quickly enough for the peak summer vacation season. (AP Photo/Rick Bowmer)

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