Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) – Investigators of missing Malaysia Airlines Flight 370 are looking into people who may have been tracking the flight online while it was in the air.
They are also looking into one of the pilots' flight simulator, and asking questions about both the pilots.
Senior research fellow at New America Foundation, and former CIA and FBI official Phil Mudd explains what they are searching for.