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Egyptian army soldiers stand guard next to the plane nose of a crashed A321 Russian airliner at the site of the wreckage in Wadi al-Zolomat, a mountainous area in Egypt's Sinai Peninsula on November 1, 2015. International investigators began probing why a Russian airliner carrying 224 people crashed in Egypt's Sinai Peninsula, killing everyone on board, as rescue workers widened their search for missing victims. AFP PHOTO / KHALED DESOUKI        (Photo credit should read KHALED DESOUKI/AFP/Getty Images)
Egyptian army soldiers stand guard next to the plane nose of a crashed A321 Russian airliner at the site of the wreckage in Wadi al-Zolomat, a mountainous area in Egypt's Sinai Peninsula on November 1, 2015. International investigators began probing why a Russian airliner carrying 224 people crashed in Egypt's Sinai Peninsula, killing everyone on board, as rescue workers widened their search for missing victims. AFP PHOTO / KHALED DESOUKI        (Photo credit should read KHALED DESOUKI/AFP/Getty Images)

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    Breaking down the theories of Russian plane crash

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Breaking down the theories of Russian plane crash

Christiane Amanpour speaks with John Goglia, former NTSB board member and an independent air safety consultant, about the crash in Egypt's Sinai.

Breaking down the theories of Russian plane crash

Christiane Amanpour speaks with John Goglia, former NTSB board member and an independent air safety consultant, about the crash in Egypt's Sinai.