Space Shuttle Columbia Disaster Pt 2: Final descent - BBC
Discovery's Launch Marks Beginning of End for NASA Shuttle Program
Space Shuttle Atlantis Lands, Ends NASA Program; Launches New Future for U.S. Exploration (2011)
The Space Shuttle program was the fourth human spaceflight program carried out by the National Aeronautics and Space Administration (NASA), which accomplished routine transportation for Earth-to-orbit crew and cargo from 1981 to 2011. Its official name, Space Transportation System (STS), was taken from a 1969 plan for a system of reusable spacecraft of which it was the only item funded for development.