The flight path that an Army Black Hawk helicopter took before its fatal collision with an American Airlines regional jet, long a concern to aviation officials, was closed to most helicopters after the deadliest aviation accident in the United States in nearly a quarter of a century. The Federal Aviation Administration restricted two commonly used helicopter routes that run north and south along Washington’s Potomac River, both of which were traveled by the Black Hawk that smashed into the jet on Wednesday night, to all but the most essential flights.
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