Nervous fliers, stop reading now.
He was caught after the driver of a crew bus smelled alcohol and called the police, according to Japanese broadcaster NHK.
A Japan Airlines co-pilot was arrested earlier this week after he was found to be almost ten times over the legal alcohol limit shortly before takeoff at Heathrow Airport.
Katsutoshi Jitsukawa, 42, had nearly 10 times more than the legal permitted amount of alcohol in his bloodstream when he was arrested, the Metropolitan Police said. The limit for drivers in Britain is 80 milligrams.
London's Metropolitan Police force said Katsutoshi Jitsukawa appeared at Uxbridge Magistrates' Court in west London and admitted exceeding the alcohol limit.
The pilot was due to fly a Boeing 777 aircraft, which can accommodate 244 flyers.
In comments quoted by the Asahi Shimbun newspaper, the Japanese transport minister has indicated the government will toughen regulations on alcohol consumption by pilots in the wake of the incident.
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JAL said the flight was delayed more than an hour and had to be operated by the remaining two pilots.
He was ordered detained until he is sentenced on November 29.
Japan Airlines issued a statement of apology, saying "safety remains our utmost priority" and that they will "implement immediate actions to prevent any future occurrences".
According to reports in Japan, the co-pilot arrested on Sunday had consumed two bottles of wine, three bottles of beer and two cans of beer the night before his flight.
Japan Airlines is not the only major Japanese airline forced to apologize for alcohol-related disruption, Agence France-Presse reported.
The incident came just a day after All Nippon Airways revealed a hung-over pilot had caused multiple flight delays.