OTD…Sept. 21 and Endeavour retirement

#OTD in 1997…Discovery launched to deploy and later retrieve the CRISTA-SPAS atmospheric research satellite

Navigating the 48-mile Panama Canal that slices through the isthmus, the final shipment of a space shuttle external fuel tank emerged into the Pacific for a three-week trek to California.

#OTD in 1995, Endeavour launched on the ASTRO-2 astronomy mission: