Radian Aerospace | 8,159 followers on LinkedIn. The World's First Single-Stage-to-Orbit Spaceplane | Radian Aerospace (Radian) is disrupting the aerospace industry with a next generation aerospace vehicle that is the world’s first fully reusable horizontal takeoff and landing, single-stage-to-orbit spaceplane, delivering people and cargo to low Earth orbit (LEO) and multiple terrestrial destinations with aircraft-like operations.