There are very few things that can stop an apache or orca rush aside from the other teams also having a ton of aircraft to counter them.. So many times on walls / lakeside 8 apaches kill Bar in 8 seconds. and its not like you stop them because the fly over the area in lakeside where tanks can't go.
Aircraft should be limited, the armor comment doesn't hold up because ramjet and sniper does far less damage than it used to in the end unless you have an apc, LCG/Patch or a normal rifle man, flying units are just as strong. It is still far too difficult for ground units to kill aircraft. MLRS, apache simply hides behind a cliff... Stank has limited range so orca just flies away. About the only thing that put aircraft in its place is the HOVER MLRS with its 12 missiles.
I mean I would like to see raveshaw or sydney take out aircraft with 3 shots, right now its 4.