this plane and killed 150 people. david barnes with us from the plane staging site. thank you for that update. joining us is tom hatter a former ntsb director of aviation safety and analyst john cox, a former u.s. airways captain and ceo of safety operations. and thank you for being . and tom, if i could start with you. and there was no distress signal given and how unusual that to occur when a crash of this type happens? it is not terribly unusual. the crew will first fly the airplane and communicate when they can. the indication is something happened catastrophically. whether it is a fire or rapid depressionde de depressioncompression. and why this happened hopefully