All Nippon Airways says it is the first airline in the world to offer in-flight draft beer from a keg.
A traditional beer keg uses a high-pressure carbon dioxide bottle which is prohibited by law on flights.
ANA sponsored development of a special beer keg dispenser that does not use a high-pressure gas cylinder.
The new device uses the pressure from carbon dioxide gas captured from dry ice. The dry ice also keeps the beer cool so a power-supply unit and refrigerator are not needed.
All Nippon Airways started offering this real draft beer on domestic flights for the first time on July 20.
The brand of the beer varies according to the route.
The price is JPY 1000 per 400 milliliter glass, including a dry snack.
Depending on the aircraft, 20-40 glasses of beer will be offered per flight.