A passenger plane from Heathrow to Detroit had to return to the London airport due to a cracked windscreen.
Delta Air Lines flight 017 was carrying 188 passengers and 12 crew on board when the pilot reported the fault shortly after taking off at 11:44 BST on Saturday morning.
The crew followed procedure by returning to London Heathrow, where the plane landed safely a short time later, the airline said.
Some customers were re-booked onto flights later today and those who could not be offered flights until tomorrow were offered meals and hotel rooms, Delta Air Lines said.
The aircraft, an Airbus A330-200, is being assessed and maintenance is being carried out, according to the airline.
No other flights were disrupted as a result of the incident, Heathrow Airport said.