Endeavour (OV-105) was the fifth and final orbiter to be declared space ready, setting off for it's first mission in May of 1992 for STS-49. In May 2011 it was supposed to fly the final shuttle mission but an extra was added and Atlantis was used to fly it. Endeavour was complied to spare parts for both Discovery and Atlantis to cut on costs. Approval to build the shuttle came from NASA in 1987 after loosing the Challenger a year before. Upon being retired the shuttle was awarded to the Califonia Science Center, after a parade through the streets the heavy move dollys could not move the orbiter over a bride, instead an unmodified Toyota Tundra hauled the 292,000 pound orbiter across the bridge.
Endeavour carried the most parts to the International Space Station of any shuttle orbiter, beating Discovery by 1 flight, both being use to structurally assemble the station as well as deliver mutlible science and logistics modules along with critical supplies.