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.
AA40 neutral territory Question
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I have a question. Can an airplane land in a in a friendly neutal territory and get those infantry on that territory?(ex: russia starts out with a tac bomber and flys into greece. can they land there, control the territory, and get those 4 troops?)
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No.
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Definate no. Air units may not capture territories. Friendly neutrals are captured by moving land units into it on their non combat move.
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Does this site allow explicit images such as swastikas?