A U.K. court sentenced a Japan Airlines co-pilot to 10 months in prison Thursday over heavy drinking before flight duty in October.

Katsutoshi Jitsukawa, 42, has admitted to the charge of drinking at a level that greatly exceeded the country's legal limit for on-duty aviation personnel.

In handing down the ruling, Judge Phillip Matthews said, "The safety of all persons onboard that very long flight ... was put at risk by your inebriation."