[Eexhaton]

Hold on, i'm not with you....does this REMOVE external sounds for planes? If so, i can't see it being very popular.... :?: hock:

Probably because it's quite unrealistic?

Try it in a car, you are not able to hear things behind you. Only when it comes by you will hear it, or when it has a really higher volume then your own car.
Now reflected on 800+ HP aircraft, i can really imagine that it's hard to hear anything over the sound of your own engine, plus the radio that's over your ears. Even with proper sound-damping materials installed for that era.

One of the very few exceptions I know about, would be the Tu-95 Bear, which is described as being so loud, that it can be heard inside the cockpit of other planes that fly near it.