How Does a Plane Go Missing?

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A MAS plane is seen on the tarmac on March 11, 2014 in Kuala Lumpur, Malaysia. Officials have expanded the searh area for missing Malaysia Airlines flight MG370.
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It's the mystery that has captured the world's attention: The disappearance of Malaysian Airlines Flight MH370, a Boeing 777 carrying 239 people on a flight from Kuala Lumpur to Beijing.

How does a plane simply vanish? 

Barbara Peterson, senior aviation correspondent and a contributor to Condé Nast Traveler, weighs in.