During the 21st century, commercial interest in reusable launch systems has grown considerably, with several active launchers. SpaceX CEO Elon Musk has said that if one can figure out how to reuse rockets like airplanes then the cost of access to space will be reduced by as much as a factor of a hundred. SpaceX's Falcon 9 rocket has a reusable first stage and capsule (for Dragon flights) and expendable second stage. The Spaceship Company has flown reusable suborbital spaceplanes, and the suborbital Blue Origin New Shepard rocket has recoverable first stages and crew capsules.