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.

Military spokesman Ron McLendon II said the Army is joining an investigation into the crash headed by the National ...

An American Airlines plane carrying 60 passengers and four crew members collided with an Army Black Hawk helicopter outside ...

Sen. Tammy Duckworth, a former Blackhawk pilot, talked with CBS News' Nikole Killion about the midair collision of a plane and Blackhawk helicopter.

An air traffic controller asked the Black Hawk helicopter via radio if it had the regional American Airlines jet in its sight 30 seconds before the Wednesday, Jan. 29 crash.

The data recorders from the plane that were also recovered appeared to be in good condition, officials said. The route used ...

A total of 67 people were killed Wednesday after a collision between an American Airlines passenger jet and an Army ...

An Army Black Hawk helicopter collided with a regional jet near Ronald Reagan Washington National Airport on Wednesday evening, U.S. officials confirmed to ABC News.

A passenger jet had to suddenly abort its landing at Reagan National Airport because of a helicopter in its flight path, just a day before an airliner and a military helicopter catastrophically ...

A passenger jet collided with a military helicopter on Wednesday night while landing at Reagan Washington ... so it's just dangerous and hard to work in. And because there's not a lot of lights ...

"The water that we're operating in is about 8-feet deep. There is wind. There is pieces of ice out there," he said.