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Game changer in this investigation. so i think we just have to back up a little bit. we have a plane that took off from kuala lumpur in the middle of the night. the middle of the night is the least traveled time for airplanes, the least time that air traffic controllers are manning the stations. things are much more relaxed. 45 minutes into this flight we now know from the prime minister of malaysia that it was either the transponder or the acars system. i'm not sure which one, was turned often, and then you have a communication, which is, all right, good night. now, with all deference to mr. ...

Definitively they think this was deliberate action. so what do want to see next in this investigation, the direction? what are some of the blanks that you need filled at this point, besides the fact that everyone would love for this plane to be located, but based on the inferring we have thus far, what are the next set of questions that you have? >> well i think one of the biggest questions for me, in addition to your point about finding the airplane, which i think is really critical is that, we have to take a -- everything that comes out of malaysia way grain of salt, at this point, because w...

The problem is i have never seen them turn to aviation before. they are not very sophisticated. they would need to contact a group from malaysia. themselves alone, i doubt it. >> early on i was asking officials in washington whether they had these capabilities. arthur, before we finish just on this point of the handoff, when that plane gave that good night, a handshake, in effect, why didn't the vietnamese authorities alert someone when the plane didn't show up on their radar screens? >> standard protocol would absolutely be that the controller who was second in the sequence, who received the ...

Commandeered at that point. the point being they knew and had to be part of the sequence of events resulting in the commandeering of that airplane. that sequence, transponder off first, followed by that communication is the game changer. that's point. it's absolutely true that sometimes pilots get sloppy in their lingo, but i don't think that you can downplay that enough. you have a transponder, which was intentionally turned off. meaning they didn't want to be seen. followed by a very last communication, all right, good night. if i'm the captain of that plane, at that point in time, i'm sayin...

Let i letting people on the ground know that something was wrong. it's possible. typically you'd get malaysia flight 370 and they would repeat the frequency to the handle of controller, which would have been the vietnamese controller. but what happened after that is also telling. you have an airplane after a transponder and system was turned off became largely invisible to the air traffic controllers. then the plane makes a left turn. shortly thereafter and heads back in a southwesterly direction. what does it mean in short? >> it's a deal breaker why? because it gives greater evidence this pl...