Also pointing out that, in a game like TripleA, where 1 round may be several months, but you can perform 1 single movement with each air unit, that movement is representing a number of going back and forth from the two territories you are landing on (that may be the same if you land where you started), as many as the implied real time would allow, at least in my mind. So, say, if you have 1 infantry and 1 transport, and the transport can transport 1 infantry per turn, that infantry should be the amount that you can transport over the course of the implied real time represented by the round (assuming you have 1 turn per round).
Similarly, for example, in a game where "Germany" is a single territory, and you bomb it from "United Kingdom", landing in there too, I see that like those bombers doing that same operation for many times over, in game being simplified by you doing it only once.