This would have required a precisely timed jump—necessitating, in turn, cooperation from the flight crew. He also missed that his reserve 'chute was only for training, and had been sewn shut—something a skilled skydiver would have checked. The very best time for this is in front of a four-day weekend, which is the timing Dan Cooper chose for his crime. Tina Mucklow, another flight attendant, agreed. The author of an overview and comparison of World War II aircrew bail-outs with Cooper's drop asserts a probability for his survival, and suggests that like copycat Martin McNally, Cooper lost the ransom during descent.
Schaffner described him as calm, polite, and well-spoken, not at all consistent with the stereotypes enraged, hardened criminals or "take-me-to-Cuba" political dissidents popularly associated with air piracy at the time. In early , U. He amassed a voluminous collection of Cooper-related news articles, and told one of his wives that he knew enough about the case to "write the epitaph for D. Most published legal analyses agreed that it would make little difference,  as interpretation of the statute varies considerably from case to case and court to court, and a prosecutor could argue that Cooper had forfeited immunity on any of several valid technical grounds. Physical evidence was incompatible with geologic evidence: He was thoughtful and calm all the time. Some surmised that the money had been found at a distant location by someone or possibly even a wild animal , carried to the riverbank, and reburied there. Mitchell released the serial numbers to the general public. Although numerous broken treetops and several pieces of plastic and other objects resembling parachute canopies were sighted and investigated, nothing relevant to the hijacking was found. She also recalled that her uncle, who died in , was obsessed with the Canadian comic book hero Dan Cooper see Theories and conjectures , and "had one of his comic books thumbtacked to his wall"—although he was not a skydiver or paratrooper. While dying of cancer in , he told Lyle, "There is something you should know, but I cannot tell you. Scott, who was flying the aircraft manually because of Cooper's speed and altitude demands, later determined that his flight path was significantly farther east than initially assumed. The crew soon noticed a subjective change of air pressure, indicating that the aft door was open. Cooper countered that it was indeed safe, but he would not argue the point; he would lower it once they were airborne. Cooper, pilot Scott, flight attendant Mucklow, copilot Rataczak, and flight engineer H. Tina Mucklow, another flight attendant, agreed. The volume case file compiled over the year course of the investigation will be preserved for historical purposes at FBI headquarters in Washington, D. Their serial numbers remain available online for public search. Cooper came home wearing a bloody shirt—the result, he said, of an auto accident. Helens , a few miles southeast of Ariel, Washington , near Lake Merwin , an artificial lake formed by a dam on the Lewis River. The FBI has never commented publicly on Dayton, who died in The gravity-operated apparatus remained open until the aircraft landed. The animation also shows Cooper jumping off the airstair. Northwest's home office objected, on grounds that it was unsafe to take off with the aft staircase deployed. The sheriff of Cowlitz County proposed that Cooper accidentally dropped a few bundles on the airstair, which then blew off the aircraft and fell into the Columbia River. There is no evidence that Cooper requested or received any such help from the crew, nor that he had any clear idea where he was when he jumped into the stormy, overcast darkness. Two F fighter aircraft were scrambled from McChord Air Force Base and followed behind the airliner, one above it and one below, out of Cooper's view.
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