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Ill-fated turn. >> we've got to look at what we know. we know the acars went out of. we know the communication saying, all right good night. the transponder was turned off. it's vital. it gives position. it gives squawk, 2157. we know from yesterday what the transcript said and we know it was at flight level three-five-zero. this is unequivocal data but it's the last we have. we know that they were told to go to 120.9. they didn't go. what were the emergency protoco protocols. there was a distress cell. it has a radio to get in touch with the cockpit and talk to other aircraft in the corridors...

People more familiar with this, say that the pilot or co-pilot -- we don't know which one was saying that now -- we were told earlier it was the co-pilot. but whoever said it should have, in the proper terminology, repeated that frequency, 1:20.9. they did not. not a major transgression. it was a routine flight at 1:19.21, the last transmission. >> a lot of language like maintaining level, climbing, climbing. nothing out of the ordinary, seeming to us, jim. but again, this is a significant piece of information to now have in your hands over there. investigators have been reluctant to turn this...

I'm going to hand you off. here is 120.9. tune to 120.9. the pilot does that. underneath that, what's happened is, this controller talks to the controller at ho chi minh and says there is an airplane coming into your air space. >> picks up the phone. land line call. >> or sometimes -- i don't know, i'm not familiar with theirs, but sometimes a text message or some kind of communication. either a landline call -- >> basically saying we're handing a plane off to you. >> yeah, 370 is squawking, 2157, it's approaching your air space. happy. and as soon as 370 zero contacts, this is 370, roger, you...

Malaysia airlines has released the full transcript of the plane's final communication. here's what we know. the jet's sign off was not all right, good night. instead good night malaysian 370. at 12:26 a.m., air traffic control, ams 370 welcome over to ground. cockpit ams 370, good day. at 12:40 a.m. the plane gets the go ahead for takeoff. air traffic control 370, 32r cleared for takeoff. good night. the cockpit 32r, cleared for takeoff. ams 370, thank you. bye. 1:19 a.m. the last time anyone would hear from the plane. air traffic controlle. malaysia 370 contact, o chi minh 120.9. good night. ...

Far. >> reporter: routine. routine is the word that jumps out at you when you look this over. you hear other aircraft, you know, mh-370's put on hold, if you will, as a flight from frankfurt is given priority for ground control. you hear the pilot getting ready for takeoff, the pushback. all these things are recorded here. and you get down to the end of it, which on my copy here is three pages long. you have air traffic control in kuala lumpur at 1:19.24 saying, "malaysia 370 contact ho chi minh 1:20.9, goodnight." now, that's the frequency that the plane would contact the ho chi minh city con...