The father of U.S. Army Black Hawk pilot Ryan O'Hara said his son loved flying over Washington, D.C., never expressed concerns about the crowded skies and described the crew as "probably the most respected pilots that Ryan had ever flown with.

The soldiers on the helicopter that collided with an American Airlines jet on Wednesday night were from the 12th Combat Aviation Battalion based in Virginia.

There were 64 passengers aboard the plane, and three Army soldiers in the helicopter, according to officials. Here's a look at what we know about the victims.