Sierra Nevada Working On Dream Chaser Space Plane for Unmanned and Manned Missions to the International Space Station.
Since the U.S. Space Shuttle program was ended in 2011 after one hundred and thirty five missions, the U.S. has had to rely on the launch capabilities of Russia in order to ferry astronauts to the International Space Station. Since retiring the Space Shuttle, NASA has been working with private contractors to develop a new space plane to carry astronauts and supplies to orbit.