are we arguing the same thing here? I understand there is a difference in the convoy boxes (with fixed values) and convoy routes (associated with a territory value), they are not tied together. Those convoy zones can be interdicted by either side if their respective enemy holds the territory.
I guess the difference with AAG40 is that you have to have a DD (1 IPC) or a SS (2 IPC) up to the territory value (In the convoy route)- not just a warship for the whole value (as in AAP). At least in AAP40 there are no convoy boxes with fixed values, only convoy routes.
I’m not sure what your idea was now. I thought you said convoy ‘zones’ were your idea- I just said they were in AAP.