Helicopters?! will it ever be possible?

[Avimimus]

It is actually much more likely than the jets (much less avionics etc.)

My own guess is that Oleg and is programmers wanted to try pushing their flight model and thought it would be fun to have something that goes "whirrrrr". Autogyros just happen to fit the correct time period.

It is interesting that my guess about the A-7 being a possibility for SoW:BoM appears to be right (although Oleg has only hinted that it might not be inappropriate for the map).