FILE - In this Dec. 10, 2020, file photo, an electronic sign warns travelers to maintain social distance in the terminal of Denver International Airport in Denver. Airlines have reported more than 500 cases involving unruly passengers since late December, and most started with passengers who refused to wear a face mask. That's according to the Federal Aviation Administration, which said Wednesday, March 17, 2021, it is reviewing more than 450 cases and has started enforcement action in about 20. (AP Photo/David Zalubowski, File)
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