Against dive bombers. Tactical bombers are literally that already. Plus, we already have 4 different type of aircraft, that is enough for me, in my opinion.
Secondly, landing crafts could be a thing: I imagine them more as a "skill" to research, which would speed up disembarking time. This could thus either be a sub-branch in the infantry section with the simple "Fast Disembarkment" name, and once researched would speed up disembarkment by let's say 10/20%. Of course, it would have to be very expensive, to be a real thing to truly invest in, and available only at day 20/30, when ww2 units start to appear.
Cargo planes are a bit too evolved in my opinion. Frankly, either wait for paratroopers in which case they will be added, or make them available at day 90 or something. Of course, there were cargo planes in ww2, notably the Me 323 Gigant, but you have to remember that they were extremely expensive, for a maximum cargo of a 100 men or a tank. Not a lot as you can see. So for me, yes why not although they could seem too evolved to many, but they would have to be very expensive, produced only in capital and with lvl. 3 airbase, available from day 40. (1 day and a half to produce would be good I think)
