Endeavouring to keep spares on hand

At Rockwell International, a spare Space Shuttle crew module is assembled alongside components intended for the orbiters Discovery and Atlantis, and though the spare isn’t intended for a specific shuttle yet to be built, it will find a purpose in the wake of the 1986 Challenger disaster: the spare crew module will become one of many completed shuttle spares that will eventually be assembled in the late 1980s as the Space Shuttle Endeavour, Challenger’s replacement and the last space shuttle constructed.