the AA vehicles have to be more effective in general. It is extremely hard to hit any air vehicle that isn't going slowly, within 700 meters, and coming straight at you.

In real life I think they would just use their radar and automatic aiming systems, they had this technology back in the 1960s.

"Electronic target acquisition, tracking, and ranging is automated; an onboard computer determines super elevation and azimuth lead."

However I don't see this coming to ArmA anytime soon - I think calculations would be quite intensive especially for a moving target.

But adjustable "zeroing", at least, is a start.

However I don't see this coming to ArmA anytime soon - I think calculations would be quite intensive especially for a moving target.

ArmA 2 OA had it, actually, after some patch. Locking a target with Tab would make your guns shoot with target's lead - you only needed to keep crosshairs on target. So it definitely was implemented and later disabled.

I don't think calculations would be a problem, every AI unit has to make the same calculations.

^Perhaps, although I am still remembering from ArmA 2, the faulty zeroing system, for example (AKM zeroed at 800 actually impacts at almost 1100m, etc

It would be nice to be able to lock onto an aerial target and just fire. I don't think the radar works on ground or very low flying targets, though.