The company did not say exactly what speed the vehicle accelerated to, but said it was close to Mach 5. Stratolaunch was founded in 2011 by Microsoft co-founders Paul Allen and Burt Rutan to provide customers with a service for high-speed testing of aircraft. To this end, the company built the Roc cargo plane in partnership with Scaled Composites, which is known for its huge size: the plane is 117 metres wide, equipped with six Boeing 747 engines and has a carrying capacity of 226 796 kg. The twin-aisle aircraft is the largest wingspan aircraft currently in service and has already taken off 14 times in various tests.