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In the middle of the night on march 8th, at 1:21 a.m., malaysia airlines flight 370 vanishes into thin air. there's been silence from the cockpit, and by 1:37 a.m., a second flight communication system, acars, isn't working either. >> acars was either switched off or it failed. we don't know which because whatever did happen, this is the crucial moment. we pretty much know that all the comes are disabled, switched off, broken, blown up. >> is an investigator looking at this, what would the determination be at least to this point of what is happening? >> at this point, i've got two

And so why it's being -- not being transmitted -- and it doesn't have to be transmitted at one time. currently what happens, too, is if they use the acars data which a lot of this is similar to acars data some airlines wait until the aircraft lands and the gear is actually sitting on the ramp before it starts uploading data about the flight that it was just finished. but if it's sent a little piece at a time it would make this much easier. we'd know a lot more about where this airplane went down. >> we'll hear more pushes to hear v that kind of technology implemented soon again. >> we'll be ta...

In the middle of the night on march 8th, at 1:21 a.m., malaysia airlines flight 370 vanishes into thin air. there's been silence from the cockpit, and by 1:37 a.m., a second flight communication system, acars, isn't working either. >> acars was either switched off or it failed. we don't know which because whatever did happen, this is the crucial moment. we pretty much know that all the comes are disabled, switched off, broken, blown up. >> is an investigator looking at this, what would the determination be at least to this point of what is happening? >> at this point, i've got two different pa...

Message sent from the aircraft's communication system called acars. richard quest is an aviation correspondent for cnn. >> think of acars as a giant smartphone that will send out huge amounts of information via satellite or by radio transmission. >> then at 1:19 a.m., a standard handoff with air traffic control as the plane leaves malaysian air space and enters vietnamese air space. >> malaysian 370. >> the controller here speaking to ho chi minh. he says good night 370. something i would do. >> there was no indication that anything had gone wrong. >> david soucie is a former safety inspector ...

Not only does it provide information to the crew by centering data but it also provides its own automatic data with reference to air speed, altitude various types of parameters. as long as that particular company subscribes to allowing that data to be released to the airline, itself. so that, like dave gallo indicated, that type of information is going to be very helpful, if it's available, of course, in helping. >> to you, david, someone who's an expert at searches in the sea, how important is it to have that acars data? what if we don't have it. >> well the fact they've got the center of the...