Washington plane crash: Everything we know so far after horror mid-air collision as details of victims emerge
Three people in the helicopter are also believed dead.Here is everything we know so far.Plane crashed into Army helicopter on descent to runwayAmerican Airlines Flight 5342 was inbound to the airport at an altitude of about 400 feet and a speed of about 140 miles per hour when it suffered a rapid loss of altitude over the Potomac River,