degrees of over statement. but in this case in terms of the pings, there were a couple of red flags that were raised. one was that one of the pings that they picked up was 17 miles from the other three pings. you re not quite sure what that meant. and that also the pings that were being generated which were at a different megahertz than what the black boxes were supposed to produce. so there were a couple of red flags that might have been caution naur. but there was no question. they had to do this search. and as mary said, they have to do it to its completion. thanks so much to all of you. appreciate it. thank you. search crews have been spending long hours searching the indian ocean mile by mile. and in a minute we ll take you aboard one of those search planes as they try to find any trace of flight 370.