Just as in FS9, I don't want any default heavies in my sim. I want it all to be real world. I've installed the complete PAI package in FS9 and this is how I've transferred it over.
1. Make a folder in your main FSX folder called AircraftAI
2. Open up your FSX.cfg with Notepad, scroll down a few lines and add a line in the relevant section
SimObjectPaths.6=AircraftAI
(if you've already made a folder called fs9aircraft - see my other post - this will be numbered 7 not 6)
3. Copy all of your PAI aircraft into this folder
4. Look in FSX\scenery\world\scenery and rename file trafficAircraft.bgl to trafficAircraft.bak
This will get rid of ALL of your default FSX AI traffic
5. Look in FS2004\scenery\world\scenery and at the very end of the file directory you will find the bgls that relate to your FS2004 AI traffic. Mine were called Traffic.bgl and Traffic_PAI.bgl
6. Copy these over into the corresponding FSX folder above.
I then renamed mine Traffic_fs9ac.bgl and Traffic_fs9PAI.bgl so I can identify them later if I want to remove them
At the end of all this, when you run FSX now your airports will be full of real world planes again - getting back to some sort of normality