Battle of Britain 2: Wings of Victory is very good, though it only does Battle of Brittain but does this very well, great 100+ plane airbattles.
I'm probably the only person in the world that doesn't like IL-2 1946 very much, imo it is very unbalanced and I don't recommend it for singleplayer. On the other hand the graphics are still very nice and it's plane handling is very convincing in general, but other than that, meh.
European Air War has the best European theater expect 100+ plane battles over Europe, it even has a SWOTL mod, but it is also very dated, flightmodeling and graphics is sub par if your used to post 2000 sims.
Another personal favorite of mine is Fighter Squadron: SDOE, it had the best WW2 flight modelling of its time, only campaigns and maps were very limited in scope. Maybe it can be solved with modding, but I haven't tried that yet.