From a previous post I learned that there's really no such thing in that it's not automatically done like intercept; if I want to protect bombers I have to make sure I include fighters as part of the overall air attack. All well and good. Now - how do I protect transport aircraft conducting aerial resupply?
You cant. The only way is to fly as many air attacks with your fighters in the area beforehand and hope that they manage to stop any enemy fighters from intercepting. If you havent got many fighters you'll lose loads of transports. If you particularly love JU52s dont play Uranus as Germans as you watch transport after transport end up being shot down trying to supply 6th Army.