The witnesses whose testimony shaped the investigation gave honest accounts of what they observed under difficult conditions. The investigators who worked the case for forty-five years applied the methods available to them with apparent professionalism and thoroughness. The independent researchers who have contributed analyses from outside the FBI have added dimensions to the case that would otherwise be absent.
And yet the answer is still not there.
Dan Cooper—whoever he was—bought a ticket, hijacked a plane, took the money, and jumped. He did this in a way that left behind only the most limited physical traces. He chose an alias that told investigators nothing about him. He left no fingerprints that could be matched. He left no DNA that could be fully profiled. He left a tie whose microscopic contents suggest a background that has not been definitively connected to any known individual.
The bills he carried—or most of them—vanished as completely as he did. The $5,800 that turned up in the sand eight years later was enough to confirm the ransom was real but not enough to answer any of the central questions.
This is the case as it stands: documented, investigated, analyzed, and unresolved. The flight happened. The jump happened. The bills are real. The identity and fate of the man who made the flight and the jump remain unknown.
The case file is 66 volumes long. The mystery is one sentence: no one knows who he was or what happened to him.