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Washington. maylasian authorities added to the time line of what we know about the plane today? >> reporter: that's right, harris, the plane was up in the air longer than they estimated. let me show you the time line. the plane took off 12 time time 41 a.m. headed to china. and someone we are assuming the pilot said all right, good night. and then one time time 22 plane draps off air track control radar. and new today the maylasian prime minister said there was a final ping. it was flying seven more hours. and that plus the reports of wild fluxations ofality to youed led the prime minister to ...

It is unlikely you will find large wreckage beyond a week. >> the airplane is down and the longer it is down less likely we'll find anything floating. five days is a good day, but now in the sixth day and depending on the currents and all of that, we don't know anything that would float. >> if we had a situation where the flight descent greated from a highality to youed only thing intact would be the wennings and tail section. as the investigators point out, after a week, they are unlikely to continue floating and the identifying the crash site diminishes still. >> cathrein harris from washing...

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