On Jan. 29, an American Airlines passenger jet and an Army helicopter collided as the plane prepared to land at Washington D.C.’s Ronald Reagan National Airport. Both plunged into the Potomac River, killing all 67 people aboard.
Since then, much of the attention has focused on the helicopter's altitude, and whether it may have been flying too high. The National Transportation Safety Board, which is handling the investigation, plans to brief reporters Friday on their probe.
