I wonder, in ArmA flying on the MH-9 as a passenger outside, you hear no wind noise. I guess the earphones they use filter the sound, but I can't imagine all of it and if the noise reducing feature of the earphones is not conceptually implemented, than there should be wind noise. Would also make the trip feel more life like (it's about the details).

Not sure, is there wind noise at all (except the sound moving trees produce I think)?