I have a few airlines in my AI flightplans.  Of course, with add-on flightplans you need new AI planes to fly them.  How can I make it so that the AI planes do not show up in the aircraft selection window in FS2002? 

   In some of the readme files for these planes, it says that "the aircraft can only be used as AI and will not show up in the aircraft selection window..."  However, some planes still show up.  This complicates the drop down menu by having all of my planes show up there instead of just the flyable ones.

Your help is appreciated!