It takes many months to find out what causes a commercial airline accident, but already there are indications that metal fatigue may have caused the jet engine on a Southwest plane to explode yesterday.  We talk with experts about wear and tear on planes that have a lot of takeoffs and landings.... and about the pilot's military training which helped her bring the 737 down safely.  Also... a closer look at why past presidents did not want to meet with North Korea's leader.  And then... the end of a dynasty in Cuba where the country's next president will not be named Castro.

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