i got all of my ai to work in fsx. all i did is go to my fs2004 folder and then to scenery, then world ,then scenery, i copied the project ai files i then went back to fsx folder and place the copied files into the same file as fs2004, SCENERY,WORLD,SCENERY and that is half the battle. i copied all the PAI files in my aircraft folder and placed them into my simobjects airplan and that was it. GOOD LUCK GUYS. finally my skies looks really good along with my airports.
feel free to let me know if this worked for you too and then spread the word