Investigators have not yet recovered the black box from the flight that crashed into the Potomac River, the National Transportation Safety Board confirmed. The black box is a flight data recorder that documents all actions and speech made in the cockpit of a commercial aircraft.

The black boxes have been recovered from the American Airlines Bombardier CRJ-700 regional jet, which collided with a U.S. Army UH-60 Black Hawk helicopter and crashed into the Potomac River on Wednesday, killing 67 people.