more than seven hours after its kwgs systems shut off. >> these moments are consistent with deliberate action by someone on the plane. >> reporter: authorities are now looking deep into the background of the pi lots as you might expect. let's talk more about this and the news that came out today. jim clancy has been tracking this investigation from the very beginning for us. jim, i want to get your take. we hear these press conferences and sometimes people don't realize when the big news come out. they acknowledge they are looking into the pilots but they say they are not ruling anything out. >> i just listen toured report. it's correct. from what we were told days before. today in this press conference what they said is, no, we're not quite sure, we don't think that the com systems, the transponder and a-card were turned off before and now we know it's the co-pilot that said all right good night. suddenly what do we have?