ago. and the listening area some distance away is much smaller still. that said, not a single verified scrap of the missing plane, nor any of its contents, has turned up yet. and that suspected ping that was detected yesterday by a sonobuoy seemed so exciting for so many. the retire e e ed air marshal coordinating the search. he says, quote, on the information i have available to me, there has been no major breakthrough in the search for mh-370. cnn s matthew chance is following the search today in perth. so it just seems so conflicting. how was it determined for the australian prime minister that he has such confidence that we re hearing the signals from the black boxes? yes, i think that he was just