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>> the control at the other end is expecting a call from that aircraft. >> but the call never comes. >> there was repeated attempts to reach the aircraft, not only on the 120.9 frequency, which is the frequency they were assigned, but also on an emergency frequency. >> there is no answer. >> they're going through their checklist for a missing aircraft, an aircraft that has apparently fallen off the radar screens and is not communicating. you know, what's going on? >> at 2:40 a.m., a worried air traffic control tower alerts malaysian airlines. they've lost contact with the plane. flight 370 has...

End is expecting a call from the aircraft. >> reporter: but the call never comes. >> there was repeated attempts to the reach the aircraft, and not only on the 120.9 frequency which is the frequency they were assigned, but also on an emergency frequency. >> reporter: there is no answer. >> they are going through the checklist for a missing aircraft, an aircraft that has apparently fallen off of the radar screen and is not commun communicating. what is going on? >> reporter: at 2:30 a.m. a worried air traffic controller is worried, because they have lost contact with the plane. flight 370 has d...

There would be all kinds of noise in the cockpit, in the cabin. go ahead, miles. you want to present that to martin? >> yeah. there are two things to consider. they had just had the handoff. in other words, the frequency change. they were told to go on to 120.9. and so what a pilot does when they say good night, at that same moment you flip the radios. if nothing else so you don't forget the frequency. and it stands to reason that two things happen. first of all, they probably didn't have time to make contact with ho chi minh. they might have been in a dead spot. a lot of times you make those ...

Geoffrey thomas is back with us from bulls brook, australia. >> geoff regarding this township of the transcript retained by the telegraph newspaper you say the signoff from the copilot still doesn't sit right with you. why? >> no. well, the international protocol from the international civil aviation organization is that the signoff should be a repeat of the instruction given by air traffic control. so typically the signoff should be mh 370, contact ho chi minh city on 120.9, good night. it repeats the instruction. that's the international protocol. all right good night is either very -- way t...

Crucial information from geoffrey thomas. >> geoff regarding this township of the transcript retained by the telegraph newspaper you say the signoff from the copilot still doesn't sit right with you. why? >> no. well, the international protocol from the international civil aviation organization is that the signoff should be a repeat of the instruction given by air traffic control. so typically the signoff should be mh 370, contact ho chi minh city on 120.9, good night. it repeats the instruction. that's the international protocol. all right good night is either very -- way too casual, not comp...