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An investigator stands near the tail of the plane in a handout released on July 7.
An investigator stands near the tail of the plane in a handout released on July 7.

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    NTSB head: There's so much we don't know

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NTSB head: There's so much we don't know

Wolf Blitzer talks with NTSB Chairman Deborah Hersman about the status of the investigation into the Asiana plane crash.

NTSB head: There's so much we don't know

Wolf Blitzer talks with NTSB Chairman Deborah Hersman about the status of the investigation into the Asiana plane crash.