The National Transportation Safety Board says a preliminary investigation has not yet determined the cause of last year's crash of an Egyptian airliner off the coast of New York. But NTSB Chairman Jim Hall said there were no unresolved safety issues. Egyptair flight 990 crashed into the Atlantic Ocean in October killing all 217 people on board. Egyptian officials said more work needed to be done, mainly on the Boeing 767's elevator control system. Speculation about the cause of the crash has centered on one of the plane's co-pilots and the possibility that he deliberated plunged the aircraft into the sea. NPR's Guy Raz reports
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