A regional American Airlines jet and a Black Hawk military helicopter collided over Washington, D.C., Wednesday night in the first major commercial airline crash since 2009. Three emergency care providers in the Washington, D.C., region have confirmed with ABC News that they have not yet received any patients from the crash.

An airspace cluttered with passenger planes and military aircraft. A history of near-crashes. And a growing shortage of air traffic controllers available to manage it all. Some experts, politicians and airport managers have been warning for years of the risks posed by the crowded airspace and volume of flights at Ronald Reagan Washington National Airport (DCA).

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

Chuck Smith says he has made that approach and landing hundreds of times in his career. He shared a video showing what it looks like to fly near Washington, D.C., and over the Potomac River. He says the airspace is notoriously busy with commercial,

Officials say there are no survivors after an American Airlines jet collided with an Army helicopter in Washington.

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 the Potomac River,

Nearly 70 people were killed in an aircraft collision Wednesday night near Washington, D.C. Are flights being delayed or canceled?

Air traffic controller 'left shift early' before American Airlines disaster - None of the 67 passengers and crew are believed to have survived, as investigators work on ‘black boxes’ found in the ruin

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.

NPR's reporting will continue to focus on what happened and learning what we can about the victims and telling their stories.