Modifying AI aircraft

[JRoc]

I seem to recall having problems with AI in the past regarding the aircraft themselves - I had an AI Airbus that just would not work, and I tried 3 other models until I found one that did work/show up.

Well, I've got a similar problem now.

The flight plan itself is fine, I tested it with an AI bird that I know works.  

The model in question is a Tupolev Tu-95; I used the .air file from an AI Aurora, and modified the aircraft.cfg, but the aircraft doesn't seem to want to appear in FS.

How would one go about "AI-ifying" existing aircraft? Properly, that is.

[andyjohnston.net]

I've also had one aircraft that wouldn't work no matter how much I tried.  I think there are certain planes, especially large ones, that just won't work as AI.

[JRoc]

Well... I got them to show up... temporarily.

When I load up at the airport they 'drop from the sky' and bounce, then dissapear.  Weird thing is, the contact points are set to what they're supposed to be.  

[JRoc]

Now this is just getting silly.  I turned a few planes (Mig19, Galeb and others) into AI using GA-Traffic, but they won't show up for some odd reason.  This sure is frying my brains...