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To this transcript here, the tower instructs 370, it is clear for takeoff from runway 32l, then says good night. then the cockpit repeats the runway, 32r, cleared for takeoff, mass 370. thank you, bye. then in the minutes that follow, nothing out of the ordinary. at 1:19 a.m., the last time anyone would hear from the plane, as it was leaving malaysian air space, heading to vietnamese air space, the tower says, "malaysia, 370, contact ho chi minh 120.9," good night. and then someone in the cockpit says "good night, malaysian 370." the only thing that was missing, the pilot didn't repeat the fre...

Them, the thank-yous, the good mornings, the good days, all going on, you know, just as normally as you would expect them to. it comes to an end at 1:19.24. air traffic control radios "malaysian 370 contact ho chi mi minh, 1:20 decibel nine, goodnight." that's telling him to contact the control tower at 1:20.9. they reply "goodnight malaysian 370," and that is the last we heard from that flight. it was bound from beijing. today the search, of course, taking place in the southern reaches of the indian ocean. really, literally, half a world away. and families and everyone here, of course, want t...

Chi minh, 120.9. it is not the end of the world in aviation terms. unfortunately, in this case, it has created questions of why it wasn't said properly. who was saying it? we thought it was the co-pilot, the first officer. they said that originally. now, they are saying they are not sure who it was. >> wouldn't that be an easy thing to determine? >> no, no, not really. because you are talking about listening. well, let me go back on myself there. you should know who was doing the radio transmissions, because that would have been the pilot not flying, p.n.f., we believe the p.n.f. was the first...

Frequency, they responded back saying "this is 370, and here's the frequency." again, back to them. on the very last one, though -- there was 12 minutes that went by between the last communication. when they did the last one, it seems to me like a different voice. because it's -- of course, can't hear it. but voice in how it was spoken. that he said "370" but didn't repeat the "120.9" is it significant, may be much ado about nothing, i don't know. but different. >> richard? >> i'll be the air traffic controller, you be the pilot. >> okay. >> this is how it should have been done. the air traffi...

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 disappeared. by 6:30 a.m., the su...