The Germans have no destroyer present, therefore the defending air units can not hit the sub, and of course the sub can never hit planes. Think of it in terms of the combined arms rule, air units can only hit subs if they are combined with at least 1 participating destroyer, the difference with this particular combined arms is that it works while attacking and defending. In the scenario that you described, the sub would destroy the remaining transport without rolling and the defending fighters can do nothing.
Where to build Japanese factory: Poll Question
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Seems very interesting Black_Elk.
It simplifies many things while allowing a lot of way to chose or not to repair and use a given Factory.
Less NO and more VC bonus seems to focus on the real objective of the game.
Nice.
Hope you can somehow add it inside the main thread on Halifax rules, maybe as a third options, or a sub-option of the second option.