before or after one of the flight data transmitting systems was turned off. let s bring in don gorelli and captain john cox. good morning gentlemen. let s start with what we just learned. they believe the co-pilot was the last one to talk to air traffic controllers. nothing seemed to be amiss. where we stand right now, what strikes you? i think the routineness of the first officer says at that point everything was normal. we know shortly thereafter several of the communication devices were either disabled or failed. the transponder, the communication radios and a system known at acars. it s the most important piece of evidence because it continued to function but the data that it would normally up link was stopped and that takes someone with an in-depth knowledge to be able to do that.