Bonus Plane Before choosing your plane on the list, hold the [right ] ALT, SHIFT and CTRL keys.
Pro Mission Editor Hold down right ALT-SHIFT-CONTROL in the main menu and select [PRO MISSION EDITOR]. Once in the editor, hold right ALT-SHIFT-CONTROL again and go to [FILE/LOAD MISSION]. Allows you to select many more missions to edit. Cool!
Extra Objects In "Create Pro Mission," hold down the right ALT, SHIFT and CTRL keys, then click on the [Create Pro Mission]. Keep holding the ALT-SHIFT-CTRL and click on the OBJECTS menu and then click on ALL. You'll now have 34 pages instead of 33.