Thomas Dunn and Dennis J. Collopy have died from illnesses connected to working on the site of the World Trade Center ...

There were 64 passengers aboard the plane, and three Army soldiers in the helicopter, according to officials. Here's a look ...

Camille Elemia contributed reporting, and Susan C. Beachy, Kitty Bennett and Jack Begg contributed research. Produced by ...

Nearly 70 people died in the fatal crash between an American Airlines regional jet and a Black Hawk Army helicopter Jan. 29.

Almost a week after a helicopter and airplane collision in Washington killed 67 people, investigators are still at work as ...