The staffing at the air control tower at Reagan National Airport was "not normal" when an American Airlines plane and Army helicopter collided on Wednesday night, a report shows.

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.

David Freeman caught a flight to International Airport on Thursday from Reagan National Airport after a American Airlines jet collided with a military helicopter over the Potomac River on Wednesday night.

The deadly mid-air collision over Washington, D.C., has reignited concerns over air traffic congestion and safety risks at Ronald Reagan Washington National Airport, a tightly packed aviation hub that shares airspace with military and government flights.

The crash near Reagan National Airport has renewed questions about the airport's flight load, considering its small size, among other issues.

Lawmakers have expressed concerns about congestion in at Ronald Reagan Washington National Airport amid a constricted space.

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

Investigators analyze flight data to understand the crash between an American Airlines jet and a military helicopter and exactly what was going on before disaster struck.

If changes aren't made, that near-miss becomes a mid-air collision,” one aviation safety expert said. “Unfortunately, that's what we had last night.”

A view of emergency response to Wednesday night’s fatal crash of a passenger jet landing at Reagan National Airport and an Army helicopter. The body of the plane was found upside-down in three sections in waist-deep water in the Potomac River.

Authorities are investigating an apparent crash involving a regional jetliner and a helicopter