Passengers wear face masks as they fly with United. (Courtesy of United Airlines) A in May by American Airlines customer Tony Scott was shared more than 6,700 times after he wrote about a passenger seated beside him who refused to wear a mask. He said he informed a flight attendant, but no measures were taken. The airline’s website states that “a face covering is required while flying on American, except for very young children or anyone with a condition that prevents them from wearing one.” Passengers aboard a United flight. (United Airlines)