Im probably the last to discover this but thought i'd share anyway,..I recently discovered that you can create a new folder to put AI models in under the SimObjects folder in FSX by adding a new command to your FSX.cfg (after making sure you back it up first !!!!),..like this pic below...
I got sick of the AI stuff cluttering up my Airplanes folder so decided to give it a try...and it works so now I have all my AI in their own folder ...YUSSS !!. open your FSX.cfg (after you backed it up ha) and cycle down to the "Main" heading and add a new line,..I called mine "AIModels", and make a corresponding folder under the "SimObjects" folder named the same...then chuck your AI stuff in it...you could use this to make a folder for anything really..spaceships etc...whatever tickles ye toes
If its useful maybe we could sticky it ?