The airline said the pilot reported a "potential minor technical problem" though airport officials in Cardiff, Wales, said the plane landed "under a full emergency."
There were 138 people on board. The plane, a Boeing 747, landed safely and was inspected by engineers before continuing to Heathrow Airport in London without further incident, the BBC said.
Notable deaths of 2014 [PHOTOS]
U.S., allies launch airstrikes against Syria