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Families hope the nearly year-long probe by the National Transportation Safety Board will promote aviation safety changes.
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NTSB blames 'deep' systemic failures for deadly midair collision near Washington D.C. NPRHelicopter just barely made contact with jet's wing in catastrophic DC midair collision, NTSB hearing reveals CNNInvestigators say deadly midair collision near Washington DC followed years of ignored traffic warnings The GuardianFAA ignored warnings before DCA crash, federal investigators say The Washington PostSafety Board Heaps Blame on F.A.A. Over Potomac Plane-Helicopter Crash The New York Tim
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The National Transportation Safety Board found the probable causes of the midair collision last year included poorly designed flight routes and ignored warnings about risks.
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