Since April, there have been two more cases of a JAL or group company employee becoming unable to fly due to drinking, prompting the airliner to issue a ban on June 23 that prohibits its pilots from drinking alcohol 24 hours before a flight during stopovers.
In October, last year Japan Airlines pilot Katsutoshi Jisukawa was found to be nine times over the alcohol limit as he prepared to fly a passenger jet from Heathrow Airport.
The Jisukawa failed a breathalyser test 50 minutes before he was supposed to fly a Boeing 777 with 244 passengers onboard.
According to the BBC the Judge sentencing the pilot said the prospect of him flying the plane in such a state was "too appalling to contemplate."
He was sentenced to 10 months in prison by a UK court.
Japanese Airlines' vice president Yasuhiro Kikuchi told reporters that the incident had changed the company's approach to the problem.
"As an organisation we are going to work together to prevent this happening again," he said.