Investigators suspect the Army helicopter crew that collided with an American Airlines jet near Washington, D.C., might have had inaccurate altitude readings and missed key air traffic controller instructions.

Black Hawk helicopter may not have heard order to go behind American Airlines jet - The Army helicopter appeared to be experiencing other issues with its communications and technology, according to sa

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.