Slitherine

I have played the map a couple of times and determined that the soviet fighter always gains air superiority. Is this intended?
If yes, then it would be fairer to abolish the axis fighter altogether, imho, as it is kind of useless as the russion always uses its air support when it has air superiority in the current mode anyhow.
If not, the random number generator is not working or severly favours a russian air victory.