Black box' cockpit voice and flight recorders recovered from wreckage - Officials say there are no survivors among the 67 passengers on the aircrafts that collided above Washington, D.C.

Sixty passengers and four crew members from the plane and three Black Hawk helicopter personnel are feared dead as a recovery mission is underway.

Following the deadly crash between an American Airlines plane and Black Hawk military helicopter in Washington D.C. on Wednesday evening, investigators are still searching for answers. NewsCenter 5 spoke with an aviation expert and asked him about what investigators will be looking for.