Last month, an American Airlines passenger jet and an Army helicopter collided as the plane prepared to land at Washington D

Hundreds of families are in mourning after an American Airlines regional jet collided with a U.S. Army Black Hawk helicopter on Jan. 29, with both aircraft plunging into the Potomac River near Ronald Reagan Washington National Airport in Washington, D.C. No one survived.

The National Transportation Safety Board provided an update on Friday into the investigation of the deadly Army Black Hawk helicopter and American Airlines flight collision.

LIVE: Watch the NTSB press conference in the video player above. The collision was the deadliest plane crash in the U.S. since 2001, when a jet slammed into a New York City neighborhood just after takeoff,