Between the volume of air traffic and the variety of aircraft, the airspace in the Washington area remains among the most complicated and restricted in the country.

Late Friday night, a small jet crashed in northeast Philadelphia, killing all 6 on board and one person on the ground. This comes just two days after an Army helicopter collided with a passenger jet ...

In the weeks and months ahead, as the mid-air collision that killed 67 on board American Eagle Flight 5342 and a U.S. Army UH ...