An American Airlines flight crashed into a U.S. Army Black Hawk Helicopter over the Potomac River as it approached Ronald Reagan Washington National Airport.
More details are coming out about the victims of this week's devastating mid-air collision between a passenger plane and an Army helicopter near Washington, D.C., killing 67 people.
This data point is one of several key mysteries investigators are exploring as they seek to explain what caused the nation's worst air disaster in more than a decade, aviation experts said.