I have already brought this up a few days ago, but wasnt satisfied with the response and attention this got. I think it´s a major spoiler for the gameplay in AH2!
Depending on the visibility you choose in AH2 (SHIFT-F1 to SHIFT-F3) the trees get turned off while flying above a certain altitude. This is to help with framerate. Here is the caveat:
A Groundvehicle hiding under a tree will be invisible (and un-strafeable) to planes that have trees displayed. But when choosing a mode without trees displayed above a certain alt (SHIFT-F3) then u can see and strafe the GV until you get below a certain alt (like 1500feet for SHIFT-F2 and 500 feet for SHIFT-F3). This makes trees useless for hiding from planes. Period.
I tested this with Darkish (thx again!) and he also helped me with posting pictures to clarify the issue. I got a response from Hitech the last time I posted, but it wasnt really answering to the problem of gameplay. I think the option to turn off trees above a certain height has to be removed!
Litjan

This shows the GV hiding under trees, even the label is almost hidden, the way it should be.
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The same view, taken a splitsecond later. I pressed "SHIFT-F3" just before taking this picture. It removed the trees and the GV is now visible to the plane. Who would have trees "on" while hunting GVs?[