Delta Airlines #DL2 to New York JFK quickly returned to London Heathrow.
The flight #DL2 departed London Heathrow at 14:45 BST more than 3 hours late.
The Boeing 767 (reg. N841MH) took off from runway 27R from London Heathrow.
But the crew required to return immediately due to a mechanical problem.
The aircraft was on hold at 9,000 ft for while before vectoring to the approach.
Only 45 mins after takeoff it landed on the same runway.