I think most pilots are thinking MA in their comments but I had something smaller in mind. EG: Modify the dueling arena to accommodate three flights (3 countries) of equal numbers of AC. So if there were 12 players there could be four 202's vs four spit5's vs four 109f-4's if those were the planes of the day. It could be an elimination game so that the side with the remaining ac wins. There are of course other possibilities for games. That would at least be a way to try a rotating plane set without committing to a big change.