>> it's just now starting to be rolled out in the states. already widely used in europe and other places around the world. this airliner was equipped with adsb and sending a signal right up until the moment it disappeared. well actually it was a little bit before it disappeared. it was functional, working. you could just use a commercially available website and see it on the screen. that's adsb. finally there's an automated system called a cars. in the position of this plane it was transmitting every half hour sending automated routine information back to malaysian airlines also apparently to the manufacture rolls royce. these are all -- these are four overlapping -- >> there's a lot going on there. the question would be what would it take for all of them to suddenly go blank? >> right.