jet Systems ’ rocket carrier , the largest aeroplane ever built , has carried out its fastest runway test to date . The dual - engined plane reached 360 mph during medium - speed taxi testing at California 's aerospace laboratory and Space Port in October . Designed to haul a variety of satellite - launching rockets into the sky , the plane has a wingspan of 385 feet , roughly the length of a football field . The company was founded in 2011 by the late Microsoft co - founder , Paul Allen .
Stratolaunch Systems’ rocket carrier, the largest aeroplane ever built, has carried out its fastest runway test to date. The dual-fuselage plane reached 90 mph during medium-speed taxi testing at California's Mojave Air and Space Port in October. Designed to haul a variety of satellite-launching rockets into the sky, the plane has a wingspan of 385 feet, roughly the length of a football pitch. The company was founded in 2011 by the late Microsoft co-founder, Paul Allen.