How many space shuttles orbiters were there?

6 in total were produced, 3 are still operational today: Enterprise - was a prototype designed to test Space Shuttle behavior in atmospheric flight. Columbia - first launched on April 12, 1981. On February 1, 2003, Columbia disintergrated during re-entry on its 28th mission. Challenger - first launched on April 4, 1983. On January 28, 1986 it broke up 73 seconds after the launch of its 10th mission. Discovery - first launched on August 30, 1984. It has flown 35 missions and is still operational today. It is due to be retired in 2010. Atlantis - first launched on October 3, 1985. It has flown 29 missions and is still operational today. It is scheduled to be retired in 2010. Endeavor - first launched on May 7, 1992. It has flown 22 missions and is still operational today. It is due to be retired in 2010.