I find that it is the exact opposite as is mentioned above, I've been able to do that the way you could consider it for nearly 15 years...if I cant find a model for fs9 I will find an AI model, copy in a panel and some sounds and viola...
but that's only to make ai planes flyable... I've also used them as AI, what some of them are designed for and also , and I have enjoyed them for just about that long.
some part of this post (above) os just talking about is using regular aircraft as ai, and a lot of simmers are agreeing that it's not advisable with this idea...but I've done it with rare problems..there are here and there but normally its just odd to say stuff like this...
as John Hinson on the avsim forums said before I was able to chime in...
"Flight Simulator 2004 has huge abilities these days with modern computers which are far more pwerful than what existed in the days when it was first released.You can use most non-AI aircraft for AI if you don't overdo it.Be aware, though, that advanced models may have performance features that are incompatible. I have seen the odd aircraft that won't take off but continues in a straight line across the ground at the end of the runway, and indeed ones in the air that just won't turn in accordance with the controller's instructions and keep getting repeated instructions to change course.Both can probably be fixed by exchanging the air files, or certain content of the aircraft.cfg with an aircraft that flies properly.The answer on behaviour is to try it and see for yourself.John"
even with that said its hard for me to have even seen that happen exactly like john said...like where it distorts stuff...really rarely thoigh...!!
heres the link to the post...and see what you have to deal with
https://www.avsim.com/forums/topic/562493-using-normal-aircraft-as-ai-aircraft/?tab=comments#comment-4148637