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Military investigators work with the NTSB to identify what happened when a Marine Corps F-4 Phantom collided with a Hughes Airwest DC-9.
Just after taking off, Air Florida Flight 90 plunges into the frozen Potomac River. It takes an ingenious experiment to uncover why it happened.
When American Airlines Flight 587 crashed into Queens, New York after 9/11, it was considered an act of terror - until evidence proved otherwise.