Radio traffic shows the air traffic controller did confirm with the helicopter that it had the airplane in sight two different times.

A 3D rendering shows the approximate altitude and paths of the plane and helicopter moments before the collision.

The airspace above Reagan National Airport, where a commercial plane collided with an Army helicopter this week, has become increasingly congested with air traffic, including helicopters.

Investigators say there are likely no survivors in the deadly aircraft collision that occurred Wednesday evening above the icy waters of the Potomac river.

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