The primary transponder on board Malaysia Airlines Flight 370 was turned off, making it difficult for air traffic controllers to detect the plane. Now, 12 days into the search, Jeff Pegues reports on ... more 
The primary transponder on board Malaysia Airlines Flight 370 was turned off, making it difficult for air traffic controllers to detect the plane. Now, 12 days into the search, Jeff Pegues reports on the questions as to why these systems can be switched off at all. less 
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Wed, Mar 19, 2014 9:03 AM EDT