flight crashes. richard, let's go over what this now means for what we know about what happened to this aircraft. we do not know why it went down, without a doubt. that we won't know until we start to get debris and even perhaps the black boxes. >> we know the aircraft stopped sending acars message at 1:07 a.m. with he know there was no further reprogramming of the plane. there was a turn at 1:22. we know the plane then flew southwest just using primary radar to show, because the transponder was off, to show its route, which was picked up by prime military and malaysian military radar. the last known contact is about 2:22:40 after it leaves the