Details of Disappearance
Donald disappeared with his wife, Karen Johnston
, and their friends, Monte Parrish
and his wife Linda Parrish
. They left Merrill Field in Anchorage, Alaska on June 29, 1997, flying in a yellow and white Cessna 182 airplane with the number N3186U. The group hadn't filed a flight plan, but may have planned a sightseeing flight over Denali National Park.
The Cessna was last sighted over the park. It vanished, along with its occupants, and there has been no sign of them or the aircraft since 1997. The Johnstons and the Parrishes are presumed to have crashed their plane, but no wreckage has ever been found.