Seattle based Stratolaunch Systems, founded by Microsoft Co-founder, Paul G. Allen rolled out the largest aircraft in the world in May 2017. The plane, nicknamed Roc, has a wingspan of 385ft (118m), has 28 wheels and is powered by six Boeing 747 engines. The purpose of the system is to launch satellites and other manned spacecraft into orbit at an altitude of 36,000ft (11km). It is weather independent and saves significantly costs for the traditional vertical launch systems. The Roc's maiden flight is still yet to be scheduled, most likely in 2019.