On October 22, 1981, 31-year-old Billy Ray Corbitt departed Anchorage in a Cessna 170B, tail number N4640C, bound for McGrath and was never seen again. The aircraft was orange, brown, and white. Corbitt was described as a Caucasian male with brown hair and brown eyes, wearing a brown down jacket, blue jeans, brown suede shoes, a brown plaid baseball hat and glasses; he had an L-shaped scar on his lower back.

The flight would have crossed extremely remote Alaskan terrain. Search and rescue efforts followed his disappearance, but no trace of Corbitt or the airplane was ever officially reported found.

Did anyone in the McGrath or Anchorage aviation community or anyone who flew that route in 1981 have contact with Corbitt or remember seeing his Cessna before it disappeared?