planes were on the plane, 30% of people forget to turn on their phones or don't comply. in asia, you have an ov over-proliferation. that seems odd to me. that sort of stands out here. >> what would it indicate to you? what would it suggest to you? >> i think we've got to see further investigation. we've seen piece parts. we're seeing pieces of information come out over time. i think what we're going to see as this investigation continues is dribs and drabs of information as they go back through the data and follow new leads. i would be surprised to learn that this is the only phone on. >> if the transponder stopped working due to a mechanical issue but the co-pilot's phone would work, isn't it odd that he wouldn't have made a mayday phone call?