Right, I understand the question (I think
)
Essentially, after AA fire is over, planes thought of as being unsupported may shift to being full support units if planes were shot down.
The only thing that makes the plane unsupported is that the attacker has fewer front line units. If one of the support planes is shot down, one of the unsupported planes would automotically be allowed to support fully.
So, place the air units on the chart in either supported or unsupported roles. Defender picks his targets and rolls his AA (probably picking the toughest or most expensive air units). Assuming he shoots down one of these fully supported air units, at the conclusion of AA fire, the attacker would shift one of his planes from its unsupported role to a normal support unit role.
Is that clear? I will spell that out in the rules more clearly as well