A pilot was suspended by his airline after being arrested and breath-tested as he was about to fly a passenger plane out of Britain's biggest airport.
Charles Nicholls, 53, a Briton, was on a Royal Brunei Airlines aircraft set to leave Heathrow airport's Terminal 3 for Brunei.
Police officers arrested him and, after breath-testing him, took him to Heathrow police station.
Mr Nicholls, who has been with the airline for around 10 years, was later bailed to return to Heathrow police station in mid-August pending further inquiries.
A replacement pilot was found and the plane took off two hours late.
In a statement, Royal Brunei Airlines said: "A pilot with Royal Brunei Airlines was asked to take a breath test by police at Heathrow airport's Terminal 3.
"As a result, he was asked to accompany the police to Heathrow police station for further tests. Later he was released without being charged and asked to return, pending further inquiries, in mid-August.
"Royal Brunei Airlines, following company procedure, has suspended the pilot while further internal investigations are undertaken."
The Government recently brought in new regulations for airline staff and ships' crews which make them subject to police breath tests.
Last week British Airways announced it was introducing its own drug and alcohol testing.