Some turns ago I did notice the following:
When you offload some specific cargo into a port city, that cargo isn't available through AIC until the next turn. I tried to draw air replacements through the AIC network, but this didn't work. No replacements were drawn becouse the order couldn't find the necessairy AIR points. Same happened when I tried to build ground replacements in another city then the port city where the ARM points were dropped off. Something like that happened also when there were CP's involved.
Production however seem to be drawing properly through AIC. Your factories seem to find the needed hvy, lgt, pet and coal, also offloaded at the beginning of the turn like above.
I didn't try it yet, but I assume that if those CP, ARM and AIR points are transported through special rail, this orders can be processed in the same turn? Is there some (game-mechanic?) rule I missed in the Victory! rulebook?