he said they now can no longer say that the acars system was turned off before the last point of vocal contact. they simply don't know if it was before or after, but it's very possible there was voice contact between the co-pilot before the acars system -- that's a data transmission system -- was somehow disabled, before the radar was somehow disabled. but this defense official went on to say that in no way affects where they are now searching for this flight, because that doesn't impact this satellite system that detected it flying for five to seven hours afterwards on one of these two giant arcs. does that make sense to you? >> well, i think that there isn't a huge amount of significance of whether the acars was switched off and the transponder was switched off and the airplane turned. the sequence of events to me is really not so important. what it does reflect is a pattern we have seen from the beginning of this investigation, which is that the evidence seems to keep changing. and the other thing that is very difficult for kind of a western