Thank you mcgyvr81. A good initial starting point for a year or two of discussion, as with the AF447 thread.
Thanks, PJ, and am glad you jumped in.
As far as the ground proximity warning systems go, I am not that confident they can predict a future flight path when in a turn and only assume that you are flying straight ahead. So in a turn the system may not be "looking" to the "inside of the turn". Our military terrain following systems looked straight ahead for the most part. Our "cross-scan" mode showed terrain above you as well as provided the vertical guidance according to your settings and such for the terrain following. So we had an advantage that the commercial airliners don't have, to the best of my knowledge. We also had the vertical guidance that showed "need a pull up in a few seconds" or, "pull up now" you dummy.
This is a sad incident, and I feel very badly for all involved, and especially for the folks that were enjoying a neat demo flight.
I'll return to the lurk mode now.