An American Airlines plane bound for London from Miami has had to turn around because a passenger refused to wear a face mask, the airline has said.
American Airlines Flight AAL38 with 129 passengers on board returned to Miami where it was met by police, it said.
They escorted a woman in her 40s off the plane, reports say.
She has been placed on a list of people barred from flying with American Airlines, pending further investigation, the airline said.
The Wednesday flight turned around less than an hour into its journey, according to tracking service FlightAware.
"American Airlines flight 38 with service from Miami (MIA) to London returned to MIA due to a disruptive customer refusing to comply with the federal mask requirement," the airline said.
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Passengers on the flight to London Heathrow were re-booked on to another flight for Thursday.
"Everyone was shocked," one passenger told CBS station WFOR-TV after getting off the Wednesday flight.
Airlines reported nearly 6,000 incidents involving unruly passengers last year and 151 in the first two weeks of this year, according to the Federal Aviation Administration. Most of them involved passengers who refused to wear masks.