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

Multiple fatalities have been reported after a horrific incident involving American Airlines flight 5342 and a U.S. Army UH-60 Black Hawk helicopter over

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

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.

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.

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

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

Leaders across the D.C., Maryland, and Virginia region, as well as federal lawmakers, are reacting to the tragic American Airlines plane crash near DCA.

Washington, D.C. fire chief said on Thursday that there are likely no survivors in the midair collision of a passenger plane and a helicopter near the Ronald Reagan Washington National Airport Wednesday night.

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.

Authorities believe there were no survivors after an American Airlines flight collided with an Army helicopter on Wednesday.