I don't think "I need to turn sharp and afterburn out of here nao!" I think "yea-yea, let me just finish this clip"
And that's how it should stay. I don't like it when a squad takes up AA on the walls of an Amp station and shoots me half a dozen hexes away.
Up until now I thought the existing flak was fine, but if you flyboys insist then flak could certainly be given a major buff
In all seriousness though, I think AA power is fine where it is at right now. It's the other aspects of ground-to-air that should be looked at, like rocket pods and AA cert gain.