ENTERPRISE Everything to Know, Plus the Test Shuttles This is a companion book to the movie Enterprise attempts to cover a bunch of little known facts and rare items. Counting the test structure vehicles, NASA used a total of 8 shuttles over the program. Enterprise was out of the public spot light for over 18 years. "The Lost Years" Yet NASA was still using this shuttle in unknown ways during that time. There was Space Shuttle Challenger OV-099 and Shuttle Enterprise OV-101. Where is Shuttle 100? Who were the pilots of the Shuttle Carrier Aircraft during the ALT Program? How did NASA lose and abandon two full size Shuttles? Did the Space Shuttles always fly on top of a 747? Did Shuttle Enterprise go in to space? Where are all of the shuttles today? The answers are all inside.