[noxryan]

Modern aircraft have excellent redundancy. Commercial aircraft already typically have 3 Pitot* tubes and 3 static ports. They need unobstructed airflow and are placed accordingly. In this kind of aircraft they do cross-verify each other as well, but if they all are reading different values, there's not much to be done. Conditions were such on AF447 that they all experienced some amount of icing until the aircraft descended enough. I don't see how having one more pitot tube is the proper response.

[darkmighty]

Well clearly having altitude/velocity readings is critical to autopilot function, so some kind of redundancy should be put in place. Not necessarily specifically more pilot tubes, but some kind of solution, like heating/deicing the tubes inlets, better placing them, etc -- guaranteeing in some way the chances that all measurements are unavailable is astronomically low.