OTD…Sept. 21 and Endeavour retirement

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

#OTD in 1998…The launch of Discovery on final shuttle-Mir docking mission

America’s first space shuttle launched on this day 35 years ago as the reusable flying machine, Columbia, lifted off from Kennedy Space Center with John Young and Bob Crippen aboard.