* Mission cancelled following suspension of shuttle flights following the Challenger disaster.

** Mission flown by Endeavour due to loss of Columbia on STS-107.

*** Mission flown by Discovery due to loss of Columbia on STS-107.
* Mission cancelled following suspension of shuttle flights following the Challenger disaster.
** Mission flown by Endeavour due to loss of Columbia on STS-107.
*** Mission flown by Discovery due to loss of Columbia on STS-107.
Space Shuttle Columbia