FILE - In this July 22, 2020 photo, a ticketing agent for Delta Airlines hands a boarding pass to a passenger as he checks in for a flight in the main terminal of Denver International Airport in Denver. .Air travel has collapsed because of the virus pandemic, and airlines are trying to convince passengers and their own employees about safety. All airlines require passengers to wear masks during flights, and most extend the rule to airports too. But some people have complained about violators refusing to keep their mask on .(AP Photo/David Zalubowski)
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Trump Transition: Here are the people Trump has picked for key positions so far
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President-elect Trump dances onstage
