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.
AAA question
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So I was playing TripleA when something rather odd happened. When I used a bomber to attack a territory with only AAA, a full on battle ensued.
So if a territory only contains AAA and the enemy attacks the territory, are the AAA destroyed immediately without a fight? I was under the impression they were.
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@superbattleshipyamato The AA rolls against the bomber as it is not a strategic bombing raid.
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Land units can take it with no battle. Air Units still get shot at with the AA as normal.
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Thank you for responding! I was wrong in prior games then. Not much I can do there.
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@superbattleshipyamato In such as case, the AAA is destroyed only if at least one air unit survives the AA fire.
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Thank you for responding! Yes, America found this rule and lost a strategic bomber for it.