OTD…April 19 and STS-100

#OTD in 1995…Columbia launched on a microgravity science Spacelab flight

#OTD in 1982…Columbia launches on the fourth space shuttle mission. #OTD in 1995…Atlantis launches on first shuttle-Mir docking flight

#OTD in 1989, Discovery launched a new Tracking and Data Relay Satellite