A Japan Airlines flight attendant who failed two breathalyser tests had drunk a mini bottle of champagne while on duty at 37,000 feet, an internal investigation has discovered. 

The flight attendant failed two breathalyser tests after a colleague noticed that her breath smelled of alcohol during a flight from Tokyo to Honolulu.

The investigation found an empty 200ml bottle of champagne, usually reserved for premium economy passengers, was found in the galley.