Just been thinking….
If Germany has a large airforce in AAE40 similar to that of Japan in AAP40, a key method of keeping those planes away from Russia is going to be UK and US strategic bombing raids. I assume Bombers from the UK (with an airbase I pray) can reach at least western Germany, meaning the Germans will need to keep some Fighters back to defend. Losses will be costly for the Allies but if escort Fighters can get into the fray (landing on Carriers in the North Sea perhaps?) then I see some serious carnage resulting. This will be particularly appealing to the Allies if strategic bombing is a National Objective. I envisage a situation where the UK regularly spends its money on replacing Destroyer and Transport losses as well as purchasing a Bomber every turn, while the US builds up its forces to conduct a land invasion of France etc.
I also hope the Germans can’t build Transports in Italy to swamp North Africa, putting extra emphasis on the Italians to keep their house in order and maintain a decent fleet in the Mediterranean. AAE original was certainly daft with the inability of the UK to hang on to North Africa and the Middle East if the Germans chose to go hard in that theatre.