The 2016 resource redirection changed the dynamic somewhat. With active FBI investigation suspended, the bureau’s engagement with private researchers became more selective. The standing offer to examine physical evidence tied to the parachutes or ransom money remains in place, but the FBI is no longer maintaining a team that actively processes theoretical leads from the public.
This shift has led to a situation in which much of the ongoing investigative effort in the Cooper case is now being conducted outside the FBI, by researchers who have no official authority and no access to all of the case materials, but who in some cases have devoted years to careful analysis of the evidence.
Whether any of this independent work will eventually produce the breakthrough that the FBI’s forty-five-year official investigation did not is unknown. But the continuation of serious research into the case reflects the enduring fascination with a crime that, uniquely among American hijackings, remains entirely unsolved.
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## The 50-Year Mark and Beyond
November 24, 2021, was the fiftieth anniversary of the Cooper hijacking. News organizations marked the occasion with features and retrospectives. Former investigators were interviewed. The FBI’s public case page was updated to reflect the resource redirection. Researchers presented theories and analyses.
The anniversary did not produce any new evidence or any official announcement that the case had progressed. It was a marker of time passed rather than ground covered.
By the time of the fiftieth anniversary, nearly everyone who had been directly involved in the case—the crew of Flight 305, the FBI agents who ran the initial investigation, the airline officials who made the decision to pay—was either elderly or deceased. Tina Mucklow, the flight attendant who spent the most time with Cooper and was the last known person to see him alive, had largely withdrawn from public life. The witnesses whose memories were the foundation of the case’s physical description had aged well past the night they were trying to remember.