On July 4, 1977, 57-year-old pilot John B. Block and his wife Jean departed Macomb Airport in a green and white Cessna 150J, tail number N50935, bound for Lost Creek Sky Ranch Airport in Luzerne to meet a son. John had 23 years of flying experience but was not instrument-rated and navigated visually. Weather was clear at an 11:10 a.m. departure, but a powerful storm later known as the Independence Day Derecho of 1977 moved across Michigan during their flight.

Around 1:00 p.m. the Civil Air Patrol in Bay City recorded a radio call in which John asked that a car be ready at Lost Creek; that was the last confirmed communication. A multiagency, ten-day search by the Air Force, Coast Guard and local authorities found no trace of the aircraft or its occupants. A possible sighting at an airstrip in Charlotte, Michigan, was reported but not confirmed. Their son, John Block Jr., has continued to seek answers, and searchers note an aluminum fuselage could still be identifiable in forested terrain. The disappearance remains unsolved.

If anyone has knowledge of wreckage or sightings from that region and time, please share information with investigators.