Hmm, the half dozen AAA I usually buy in the core must be a real waste then...
Actually AA
does do for planes, mobile units tend to be better, but if I buy ground mounted Flak then I usually buy light trucks or halftracks to shift them about the map with.
The key to AA is having them close to what the planes are attacking - within 10 hexes or so seems best. So they do have to keep up with the advance, which is SP Flak's advantage. But then the OPFOR may see them and shoot them up, which is annoying
All I really ask of my AAA is that they at least take a damage point off any passing plane - then it won't be coming back to annoy me.
If you play as Germany of course, then the sheer numbers of Allied and Soviet air in the end war is a pain. But that was historical, so the end war German army should probably look to converting some core units that say used to be AT assets into SP-AAA.
cheers
Andy