American Flyers Flight 280/D, a Lockheed Electra, crashed 2,4 km northeast of the Ardmore Municipal Airport, OK (ADM). Of the 93 passengers and five crewmembers aboard, 18 passengers survived, however, three of them later succumbed to injuries. The aircraft was destroyed by impact and subsequent fire. The aircraft operated on a Military Air Command contract Civil Air Movement Charter flight from Monterey, CA (MRY) to Columbus, GA via Ardmore, OK. Flight 280/D departed Monterey Peninsula Airport at 16:32. The crew missed a runway 08 ADF instrument approach to Ardmore, so they attempted a visual circling approach to runway 30. The aircraft struck a hill at an elevation of 963 feet (airport elevation being 762 feet msl). PROBABLE CAUSE: “The incapacitation, due to a coronary insufficiency, of the pilot-in-command at a critical point during visual, circling approach being conducted under instrument flight conditions.”