787
I was going to post earlier with this retired old git's theory, that when a brand new aircraft off the line leaves the factory and is put through its paces in the air, the test pilots are using a particular make and even quality of headset, and then maybe the customer buys a different make.
I checked this out with the off-spring ( not the Swanwick ATCO, but the Airbus TP ) and it seems for once it my life I was absolutely right!
He used to fly for Richard's airline and says their headsets were so cheap and poor that no decent music fan would ever use one! Add to that,he said, the fact that many pilots take their hats off and go to loudspeaker above a particular FL.