Mary Schiavo returned to my America Weekend show today to discuss developments in the mystery of the missing Malaysian Airlines flight 370. We discussed the new information about the plane changing direction, whether it could have climbed to 45,000 and then dove dramatically without falling apart, and how many people it would take to hijack a Boeing 777 in mid-air. I also asked her the two questions that have bothered me since this story started — why don’t we have a system that tells us where every plane is while in flight, and why are pilots allowed to turn off the transponder that reports its location?

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Mary Schiavo is a former Inspector General at the US Department of Transportation who now represents victims of aviation crashes and other incidents.