So, what I'm thinking is;
The option to (when in the dogfight against ai mode) fight an enemy flight consisting of somewhere around 4 enemies.
Also to be able to fight with your own flight of around 4 planes
Ability to select your fighting area (above any one of the main islands, or just out at sea)
Situation selection; To give your flight an advantage (above, behind), disadvantage (with the enemy above and to your rear) or none (just straight at each other)