US authorities say Washington DC air crash was "100% preventable" | ABC NEWS

The National Transport Safety Bureau says a mid-air collision between a passenger plane and Army helicopter in Washington D.C. was 'completely preventable'.
The air crash investigators says Army helicopters were allowed to fly too close to passenger jets and found failings in Army safety culture contributed to the crash.
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Видео US authorities say Washington DC air crash was "100% preventable" | ABC NEWS канала ABC News (Australia)