OTD…April 12 and STS-1 and 51D

#OTD in 1990…Columbia launched to retrieve NASA’s Long duration Exposure Facility (LDEF) on the longest Shuttle flight to date.

#OTD in 2006…A star-spangled start to Discovery’s STS-121 mission

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