UND aviation experts urge patience as investigators analyze the Reagan airport crash, saying that it's too early for any speculation.

U.S. authorities said on Thursday it was not yet clear why a regional jet crashed into a U.S. Army helicopter at a Washington airport, killing 67 people in the deadliest U.S. air disaster in more than 20 years.

DCA is one of the most demanding airports in the world. It also has what’s known as ‘helicopter alley’ with hundreds of police, military, news and rescue helicopters criss-crossing

As the American Eagle Flight 5342, a CRJ jet, approached the helicopter, the tower controller asked the helicopter pilot if he had the CRJ in sight. The helicopter pilot cannot be heard responding to the question before the two aircraft collided.

An Army Black Hawk helicopter collided midair with an American Airlines flight from Wichita, Kansas, at Reagan National Airport on Wednesday.

Political leaders had warned about the dangers of Ronald Reagan Washington National Airport in Washington, D.C. months before an American Airlines flight collided with a U.S. Army Black Hawk helicopter on its approach to the airport.

Ronald Reagan Washington National Airport (DCA) remained shut down on Thursday morning after an American Airlines regional jet fatally collided mid-air with a military helicopter just outside the airp

An airplane collided with a helicopter while trying to land at the Ronald Reagan Washington National Airport on Wednesday night, officials said.

Extraordinary video captured the moment a fireball exploded in the sky as an aircraft crashed into a blackhawk helicopter at Ronald Reagan Washington Airport.

Flight operations not expected to resume until late Thursday morning, at the earliest, at Reagan National airport after plane crash Wednesday night.

The airport has resumed flight operations after a deadly crash involving a passenger jet and military helicopter halted all arrivals and departures.