Additional balance note:
On TripleA I set all sides to the Fast AI to guarantee equal players. As you can see, the Allies clearly won:
While I can understand the rational for land units being excluded from the Pripet Marshes what rational supports restricting flights over the same?
There is none. It doesn’t matter anyway. There are 4 territories surrounding it. Planes flying over take at most 2 moves from one surrounding territory to the other. However, all 4 territories are 1 or 2 spaces from each other anyway