In his autobiography, Paul said he believed large-scale, orbital space tourism was possible within a decade. And, in the years since, we’ve seen that momentum gather. His final space achievement, and the one that pushed his vision for space accessibility even closer to becoming a reality, was the design, construction and historic flight of Stratolaunch. The carrier aircraft, which is powered by six 747 engines, features a wingspan the length of a football field. Stratolaunch was engineered to push the boundaries of airport-style mobile launch operations that will make access to space more convenient, affordable, and routine.