This article is from the Flight Simulators FAQ, by with numerous contributions by Bob Wittick rwittick@msu.edu others.
Joel Murray writes:
There is a bug-fix available directly from Virgin. All you have to
do is send them a letter stating that you want the fix and enclose
the UPC code from the back of the box. I did and have experienced
NO problems since installing the fix.
By the way, if you type SHUTTLE /ALL (I think), all of the missions
become available to you.
 
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