Late last evening and just this morning, I've begun hearing discussions about the flight control systems in Airbus and pilot's misinterpretations being a possible factor. Another topic touched upon briefly was "jet upset", an event that can happen because of the fact that jets operating at such high altitudes where the air is very thin can be very close to the stalling speed even at the proper cruising speed. Any sudden movement of the controls or rapid change in relative wind because of weather (especially in a thunderstorm) can cause a high speed stall from which it is very difficult if at all possible to recover.