Fixed or dynamic flight ceiling in PS2?

[TerminatorUK]

So whilst playing PS1 last night, it struct me in certain locations (e.g. top / edge of the crater in the middle of Searhus) that mountains are so high that the static flight ceiling doesn't permit you to fly over them.

In PS2, will the flight ceiling have a dynamic height (based on the land below) in order to be able to fly over any mountain or has it simply been designed that all objects/terrain in the world is lower than the flight ceiling?