Harbor Air, the world’s largest floatplane-only airline says it will be the first electrically powered airline and will convert its entire fleet of 41 vintage de Havilland Beaver, Otter and Twin Otter aircraft and one Cessna Caravan to electric motors.

Harbour Air is teaming with Washington State-based magniX, which has developed a 750-horsepower electric motor and battery pack that gives a maximum endurance of about an hour for the heritage airframes (some of them more than 60 years old) that will carry them. Since most of Harbour Air’s flights are 30 minutes or less, the motors and batteries currently available will serve most routes.