EgyptAir Flight 990 was on a routine flight when, en route to Cairo, the plane suddenly lost altitude and plunged towards the water. Tragically, the Boeing 767 slammed into the Atlantic Ocean off the coast of Nantucket Island, Massachusetts, killing all 217 people on board. After the October 31, 1999 plane crash, the Egyptian government asked the American NTSB to handle the investigation. As investigators raced to find the cause, they had to consider every option. Was it a mechanical failure, or an intentional human maneuver that caused the plane to crash?

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