OTD…Sept. 20 and Endeavour retirement

#OTD in 2000…Discovery launched on the 100th space shuttle mission

The last remaining external fuel tank built for the space shuttle program but never flew will depart its factory in New Orleans on Tuesday for a long sea voyage to the California Science Center in Los Angeles.

#OTD in 1991, 1992 and 1993…flights by Discovery and Endeavour