An internal probe at Japan Airlines Co. has concluded that a female flight attendant who tested positive for alcohol last week had consumed alcohol while on duty, the airline said Tuesday.

The cabin attendant tested positive in two Breathalyzer tests conducted after a colleague noticed that her breath smelled of alcohol during a Tokyo-Honolulu flight, and she was removed from duty for the remainder of the flight, JAL said.

"An unserved (6 ounce or 200 ml) bottle of Champagne for premium economy was found empty in the galley area," JAL said in a release, citing that fact as one basis for the conclusion.