@anjew I assume no engine limitations, i think air AOE is perfectly possible. It just isnt a solution.
Are you asking for "AA-Gun is OP" evidence?
1 See my previous post with the picture. AA gun kills assets the fastest of them all.
2 A yak circling idly just outside AA gun range is killed in a half circle if AA gun sees it.
3 You can't get away from an AA gun pop without significant losses even with the fast MIG.
4 You can place an AA gun 2 tiles away from a sam site and it will STILL cover all of the area of the sam site as well.
5 In team games/big maps Soviet Paradrop and Parabombs get shot down casually by two AA guns.
There. That is
crushing evidence that the DPS of that thing is way to high!
Solution I did also offer in a previous post. reduce damage by 60% (yes, that much) and improve vision by +1 cell.
I will post a testmap with those parameters later.
EDIT:
Map done
http://resource.openra.net/maps/23272