the transponder was turned off three minutes after the pilot's final verbal communication. you want to hear what he thinks that suggests. we'll have dr. nicholas defanzo. the area of expertise is the spread of rumors and were we are so inclined to believe them. let's get started. assuming malaysian airlines flight 370 is at the bottom of the indian ocean, searches for it poses enormous challenges. it calls to mind the hunt for the titanic. that was found 74 years after it sank. tim weller is the operations manager at phoenix international. he also was project manager in the search for air france 447 in 2009. we have michael kay, a retired