What does the U.S. know about MH 370?

This image taken on December 26, 2011 shows the Malaysia Airlines Boeing 777-200ER that has gone missing.
This image taken on December 26, 2011 shows the Malaysia Airlines Boeing 777-200ER that has gone missing.

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    What does the U.S. know about MH 370?

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Former Director of National Intelligence John Negroponte weighs in on what the U.S. knows about the vanished flight.