Another thing is that we also need a scenario to fill up and need balanced capabilities side to side.
Most actual WWII air battles are not (without tweaks) balanced for AH play. History often had unbalanced side numbers (like 2:1 or 4:1 or 10:1), or unbalanced types of aircraft (like Zeros vs. F4U's and F6F's, LaGG-3's and MiG-1's vs 109G's, Spit V's vs. 190A's, P-40's vs. 109's and 190's), or one side having to fly a long distance to the fight, or there being way more bombers, or Stukas, or Il-2's, etc. than fighters in the battle.
To deal with that, we make numbers more even side to side, boost percentage of competitive aircraft types, use available models of aircraft as substitutes, increase fighter:non-fighter ratios, move targets and launch locations closer together, and make one side's time to target similar to another side's time to target.