Air traffic controller 'left work early' before deadly crash as helicopter's flight height comes into question - A single controller was left to handle the air traffic of planes and helicopters flying ...
The NTSB said the aircraft had difficulty seeing each other before the crash.
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.
After a yearlong investigation, the National Transportation Safety Board did not find a single cause for the deadly collision ...
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