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Among the unanswered questions about the crash near Washington, D.C., are the flight pattern of the Black Hawk helicopter and the exact nature of its training exercise.
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No one is believed to have survived the disaster
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It will be some time before investigators can offer clear answers to the cause of the midair crash at Ronald Reagan Washington National Airport but air traffic controller audio and radar reviewed by NPR offer some insight into what happened before.
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Authorities believe there were no survivors in the accident, which happened as a regional passenger jet was attempting to land Wednesday night at Ronald Reagan Washington National Airport.
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