An American Airlines jet and a U.S. Army helicopter plunged into the Potomac River after a midair collision Wednesday night ...
In order to enable safe flight, airspace is split into categories ranging from very tightly controlled areas around airports ...
The crash killed at least 28 people, with the rest aboard feared dead, after the plane collided with a U.S. Army helicopter ...
Through maps, videos, photos and radio transmissions, CNN is piecing together what occurred during the deadly, midair collision.