In 1994 , American Eagle Flight 4184 encountered heavy air traffic and poor weather that postponed the arrival of this flight at Chicago 's O'Hare International Airport , where it was to have landed en route from Indianapolis , Indiana . The ATR-72 , a twin-engine turboprop carrying 68 people , entered a holding pattern southeast of O'Hare . As the plane circled , the freezing rain formed a ridge of glaze on the upper surface of its wings , eventually causing the aircraft 's autopilot to suddenly disconnect and the pilots to lose control . The ATR disintegrated on impact with a field below . All passengers and crew were killed
American Eagle Flight 4184
American Eagle Flight 4184
Glaze (ice)