Passengers wearing face masks to help protect against the coronavirus take a rest at Pudong International Airport in Shanghai, China on July 25, 2021. Delta Air Lines said Monday, Dec. 27, 2021, that new cleaning requirements at a Shanghai airport were behind the decision to turn back a recent flight from Seattle in midair, a move that had prompted a protest from the Chinese consulate in San Francisco. (AP Photo/Andy Wong, File)
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