So bring back old CAS (commander and ability). Balance by giving both sides bullshit.
Throw in arty cover for good measure, since you can just leave the area.
It is not what i meant. Right now, it is that ALL AA Units are reliably taking down planes. You can punish the 180-240 Muni price with an AA Unit. If you know his commander, then adapt, to lower the effiency of the planes by far. Coh2 is about having right counters to your enemies units, or the better Army composition, besides micro and skill.
I think the planes are not a very big problem, if you actually counter them. Also CAS commander planes can be taken down now.