Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. One plane, 25 countries now searching for it, and hundreds of theories have so far added up to zero in the hunt for Malaysia Airlines flight 370, though we know a lot more about this flight than we did go into the weekend. The lengths that someone inside that cockpit went to render that plane virtually stealth, the direction it took, and about the pilots themselves, whose lives are being examined in close detail by investigators who are now working what is officially a crime mystery. Lets get more of our expanded coverage of this crime drama. Nbcs tom costello starts us off tonight. Tom, what are they doing to find this airplane . Reporter investigators have now reenacted in a simulator what little they know of flight 370s path and have asked our countries to recover sensitive radar data, looking at the planes path. Meanwhile, theyre looking at the backgrounds of everybody o
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