Originally Posted by
flyerCO
DLs D1 headsets are 2 prong. They don't use the triangular 3 prong headsets.
Oops. I've been doing a lot of AF/KL flying lately, so must have mixed up my sockets.
(Fortunately, whether or not a third pin is present, a two-pin adapter is almost always all you need, and I believe the pin spacing is more or less uniform across carriers.)