Flight data reorders, also known as black boxes, could offer crucial clues into what went wrong above the Potomac River.
US President Donald Trump blames diversity rules under his predecessors, saying he believes people hired for air traffic control roles were not always qualified – but he offered no evidence for this.
The National Transportation Safety Board said it has "a lot of information but…need some time to verify that" and a preliminary report will be issued in 30 days.
Details about some of the 67 people who died in the crash in Washington DC are now beginning to emerge.
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