Nancy Elizabeth Branch, 29, vanished without a trace during a small-plane flight on December 6, 1992. A Stanford graduate with a promising career, she was returning from a weekend trip to Santa Barbara with her fiancé Kevin Clarke and friends Alan and Amy Stewart in a single-engine Piper Archer. Shortly after takeoff the plane lost contact and sent no distress signals, even though weather was described as treacherous.

An extensive search looked for a crash near the Big Basin area but turned up no wreckage or remains. The four passengers are presumed deceased, yet because the aircraft and bodies were never recovered they remain classified as missing persons and the Menlo Park Police Department continues to investigate.

Does anyone have information about that December 1992 flight, the route near Big Basin, or sightings from that day that could help fill in what happened?