AA gun shots are directed fire (i.e., shoots at EACH air unit). Therefore, you roll a specific die for each plane.
Not exactly. According to the FAQ, you don’t literally roll a specific die for each plane, you just roll for the bombers and the fighters separately. It’s still up to the air units’ owning player which individual units are hit within that type. This makes a difference only insofar as choosing to lose a plane that has travelled further to the combat in order to allow more flexibility in where to move surviving planes after combat.
The purpose of this rule is simply to keep the owning player from assigning all AA hits to fighters rather than bombers.
Krieg, thanks for the clarification. You are correct. I think Triple A automatically assigns the hit to the plane traveling farthest, which is virtually always what you would prefer.
I thought Triplea picked the individual planes by random. I’m pretty sure I’ve had battles where I was left with fewer movement points than I expected.