An investigation has been launched after a British Airways flight from London to Glasgow had to turn back because the two pilots were taken ill.
The Airbus A320 had taken off from Heathrow on 20 December when a request was made for an emergency landing after the flight crew requested oxygen.
A BA spokeswoman said the aircraft landed completely safely.
The Civil Aviation Authority was notified and the Air Accidents Investigation Branch probe started.
British Airways said oxygen masks were deployed on the flight deck as a precaution.
Once the plane had landed in London, passengers disembarked and were flown to Glasgow on a replacement service with a new flight crew after a short wait, the company said.
The spokeswoman said passenger safety was paramount.
Source BBC