World WarII online is currently the most compreheinsive WWII simulation and would probably dominate the market if it had a decent air to air model.
HTC would seriously upgrade their users if they added a more intensive ground combat simulation.. anyone who has played or seen WWII online knows their ground combat simulation is not at all sofisticated.. HTC could duplicate or "simulate" this very easily.
Infantry battles would be a welcome addition to the game.