I should also add I once worked for a big US gaming company who had access to Warner Bros Studios audio assets. The audio library was massive, you could easily get lost in there. I bet when you searched for a sound of a helicopter in that database the B206 rated the highest.
I would also like to add that the sounds in that database were professionally recorded and are without blemishes. It makes the producers life much easier as long as they pay the royalty fee for using it.