Sloped Runaways, Sloped Aprons and AI

I have been reading into the limitations of making an AI behave correctly in sloped runways/aprons.

As far as I understand, in P3D (and FSX) the AI follow the reference altitude and not the current terrain altitude. Is this correct?

Also, what happens with sloped flatten polygons in airports? Does the AI follow terrain?

If someone could explain what is the root of the problem with AIs, I appreciate it.



Resource contributor
The AI aircraft know nothing about terrain, and will not follow it. They read the airport's elevation and stay at that elevation while on the ground.