Starting at the main menu. hold these 3 right buttons on the keyboard --
ALT, CTRL, and SHIFT. Continue holding and click on single mission. You
will now have all the missions from previous Janes sims (100+ more
missions). You will also be able to fly an "atomic moth" and a "Q......"
(some kind of flying dinosaur.)

This has been tested to work (must be right shift, right alt & ctrl)