river and a mile north of where the accident took place was right off haines point where the anticosti river and the potomac river come together and aircraft and you see some continuing to land when they fly north to south and fly a river route that is called because of restrictions and security. they fly a meandering path down, and when they get to gravelle point, they take a hard land and the other way, and it's a hard landing, runway 33, and go over joint base anticosti and take a significant left hand turn and coming shorthand final for the runway and that's where the helicopter and the regional jet track include met at 100 feet of height. sandra. >> i'm sandra smith and you are looking live at washington. and we're going to see the jarring moment the aircraft collideed and a warning that this is hard to watch. and that is the spark and that is when the collision took place. when you saw it blow up in the sky, the american airlines flight was coming from wichita, kansas, and it was making its final approach into reagan national airport, and as we know now, 60 passengers and 4 crew