Originally Posted by Schroeder

I'm not aware of any AI mods.

@CCIP
There's much more to it. AIs which are not set to expert or ace can't do even the easiest deflective shooting. Just evade slightly and they'll never hit you. Wingmen don't engage when their leaders are attacked, damaged planes disengage combat but don't fly straight back to base but continue their flightplan (even if this leads them deeper into enemy territory with an already screeching engine), planes in rtb mode won't respond to attacking enemies expect for some half a$$ed evading manoeuvres which will never safe them. The AI can see through clouds and at night, 360° all round view. It cheats with the physics and is faster than any human in the same aircraft.
That's just out of the top of my head.