The black boxes for a commercial flight that crashed into a military helicopter in Washington DC have been located, as questions mount about staffing and other close calls at the airport where the plane was landing. Normally two people manage air traffic control for helicopters and airplanes flying in the area – one of the most controlled airspaces in the world – but only one person was on duty on Wednesday at the time of the crash, according to sources cited by the BBC’s US partner CBS News.
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