UPDATE 1-U.S.-bound United Airlines lands back in London after 'maintenance issue'

Flight UA28 to Newark, New Jersey, operated by a Boeing 767 aircraft, had been circling off the south coast of England for more than four hours before it landed at Heathrow at about 1546 GMT. Earlier, United said in a statement: "United Airlines flight UA28 ... with 227 customers and a crew of 13 on board, is returning to Heathrow because of a maintenance issue."

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