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302 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.

Case Description

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Summary based on the NamUs case record (MP21546) and 9 other sources
On the morning of July 4, 1977, a day meant for celebration, 57-year-old John B. Block and his wife Jean embarked on a journey that would become an enduring mystery. An experienced pilot with 23 years of flying, John was at the controls of their privately owned, green and white Cessna 150J, with the tail number N50935. They departed from Macomb Airport in Macomb County, Michigan, with a plan to meet one of their sons in the northern part of the state at the Lost Creek Sky Ranch Airport in Luzerne. John, a veteran pilot, was not instrument-rated and relied on visual navigation, often following major highways. The weather was clear upon their 11:10 a.m. departure, but a powerful storm system, later identified as 'The Independence Day Derecho of 1977,' was moving across the state, bringing with it destructive winds.

The flight, which should have taken less than two hours, stretched into an unnerving silence when the Blocks failed to arrive at their destination. They had not filed a formal flight plan, which complicated initial search efforts. A single radio transmission was picked up by the Civil Air Patrol in Bay City around 1:00 p.m., in which John requested a car be ready for them at the Lost Creek airstrip. This was the last known communication from the couple. An extensive ten-day search was launched by the United States Air Force, Coast Guard, and various law enforcement agencies, covering land and water, but no trace of the plane or its occupants was found. The search was further complicated by a report of a possible sighting at an airstrip in Charlotte, Michigan, far from their intended route, where a pilot believed he saw the couple attempting to refuel.

Decades have passed since John and Jean Block vanished from the sky, leaving their family with unanswered questions. Their son, John Block Jr., has continued the search for his parents, hoping that hunters or hikers in the dense woodlands of the Huron National Forest or the Atlanta State Forest might one day stumble upon the wreckage. The plane's aluminum fuselage would not have rusted, making it potentially identifiable even after all these years. The prevailing theory is that John may have become disoriented due to the severe weather or experienced a medical emergency, as Jean did not know how to fly. The disappearance of John and Jean Block is a poignant reminder of how quickly a routine flight can turn into a lasting tragedy, leaving a family to grapple with the uncertainty of their loved ones' fate. The case remains open, a silent testament to a holiday journey that never reached its destination.

Last Seen: Jul 4, 1977

Possible Unidentified Matches (10)

Unidentified remains cases whose details are consistent with this person, ranked by how closely they compare. Fields that are unknown in either case are left out of the score.

79%Possible
John Doe — Cleveland, Ohio - unidentified case UP15655
John Doe — Cleveland, Ohio
UP15655 • Found Dec 15, 1986
View case
Sex ✓Male
Age 100%Est. 50–65 vs 57 when missing
Race 100%White
Location 74%104 mi away
TimingFound 9 years after last seen
Height 100%5'6" vs 5'6"
Weight 86%164 lb vs 140 lb
Hair 100%Gray vs Gray
Eyes 100%Brown vs Brown
79%Possible
John Doe — Detroit, Michigan
UP81207 • Found Nov 19, 1985
View case
Sex ✓Male
Age 84%Est. 35–55 vs 57 when missing
Race 100%White
Location 98%19 mi away, same state
TimingFound 8 years after last seen
Height 100%5'6" vs 5'6"
Weight 100%148 lb vs 140 lb
Hair 100%Gray vs Gray
Eyes 0%Blue vs Brown
79%Possible
John Doe — Hamtramck, Michigan - unidentified case UP11696
John Doe — Hamtramck, Michigan
UP11696 • Found Jan 30, 2009
View case
Sex ✓Male
Age 100%Est. 45–60 vs 57 when missing
Race 100%White
Location 98%16 mi away, same state
TimingFound 32 years after last seen
Height 100%5'6" vs 5'6"
Weight 100%147 lb vs 140 lb
Hair 100%Gray vs Gray
Eyes 0%Blue vs Brown
78%Possible
John Doe — Romulus, Michigan - unidentified case UP8211
John Doe — Romulus, Michigan
UP8211 • Found Apr 21, 1988
View case
Sex ✓Male
Age 84%Est. 35–55 vs 57 when missing
Race 100%White
Location 94%33 mi away, same state
TimingFound 11 years after last seen
Height 100%5'7" vs 5'6"
Weight 91%160 lb vs 140 lb
Hair 70%Brown vs Gray
78%Possible
John Doe — Detroit, Michigan - unidentified case UP11895
John Doe — Detroit, Michigan
UP11895 • Found Jul 28, 1985
View case
Sex ✓Male
Age 60%Est. 50–99 vs 57 when missing
Race 100%White
Location 97%20 mi away, same state
TimingFound 8 years after last seen
Height 100%5'6" vs 5'6"
Weight 100%130 lb vs 140 lb
Hair 100%Gray vs Gray
Eyes 100%Brown vs Brown
77%Possible
John Doe — Detroit, Michigan - unidentified case UP115564
John Doe — Detroit, Michigan
UP115564 • Found Jan 26, 2024
View case
Sex ✓Male
Age 100%Est. 58–72 vs 57 when missing
Race 100%White
Location 97%21 mi away, same state
TimingFound 47 years after last seen
Height 68%5'9" vs 5'6"
Weight 100%137 lb vs 140 lb
Hair 100%Gray vs Gray
77%Possible
John Doe — Detroit, Michigan
UP13149 • Found Mar 11, 1997
View case
Sex ✓Male
Age 85%Est. 40–65 vs 57 when missing
Race 100%White
Location 97%20 mi away, same state
TimingFound 20 years after last seen
Height 100%5'6" vs 5'6"
Hair 100%Gray vs Gray
76%Possible
John Doe — Cleveland, Ohio - unidentified case UP15811
John Doe — Cleveland, Ohio
UP15811 • Found Oct 3, 1981
View case
Sex ✓Male
Age 86%Est. 45–55 vs 57 when missing
Race 100%White
Location 74%104 mi away
TimingFound 4 years after last seen
Height 100%5'7" vs 5'6"
Weight 100%130 lb vs 140 lb
Hair 100%Gray vs Gray
Eyes 0%Gray vs Brown
76%Possible
John Doe — Detroit, Michigan
UP12287 • Found Jul 8, 1991
View case
Sex ✓Male
Age 85%Est. 40–60 vs 57 when missing
Race 100%White
Location 97%20 mi away, same state
TimingFound 14 years after last seen
Height 68%5'3" vs 5'6"
Weight 100%154 lb vs 140 lb
Hair 70%Brown vs Gray
Eyes 60%Hazel vs Brown
76%Possible
John Doe — Detroit, Michigan
UP12004 • Found Oct 29, 1983
View case
Sex ✓Male
Age 85%Est. 50–70 vs 57 when missing
Race 100%White
Location 97%20 mi away, same state
TimingFound 6 years after last seen
Height 68%5'3" vs 5'6"
Hair 100%Gray vs Gray

These comparisons are generated automatically from public NamUs case data and are not confirmed identifications. Only DNA, dental or fingerprint comparison by investigators can confirm an identity. If you believe two cases are connected, contact the agency handling the unidentified case.

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