On the evening of Aug. 12, 1964, 41-year-old California businessman Charles Ogle climbed into a four-seat Cessna 210 and took off from Oakland International Airport without filing a flight plan. He was never seen again.

Rescuers searched for Ogle for 60 hours before giving up.

“This has hung over me my whole life,” Ogle’s son William told the San Francisco Chronicle in 2007. “I don’t remember the emotional impact because I was too young, but my teachers would complain to my mother because I would look out the windows all the time looking for his plane. I just thought he didn’t come down yet.”