Astronauts say commercial partners will be in the future of space flight . Atlantis lifted off July 8 on NASA 's final space shuttle mission . A mission specialist says he hopes space travel will be cheaper and more frequent . Discovery is scheduled to land Thursday morning . The launch will mark the end of NASA 's 30-year shuttle program .
Astronauts say commercial partners will be in the future of space flight . A mission specialist says he hopes space travel will be cheaper and more frequent . Discovery is scheduled to land Thursday morning . The launch will mark the end of NASA 's 30-year shuttle program .