American Airlines flight AA135 had to return and make an emergency landing at London Heathrow airport, on December 15.
The airline said that the Los Angeles-bound Boeing 777 had to turn back due to a medical emergency.
The plane, carrying 267 passengers, landed back safely at around 4 p.m.
Authorities said the flight again departed London shortly after 6 p.m.

Air France flight AF-66 made an emergency landing in Goose Bay, Newfoundland and Labrador, Canada, on September 30th.
