DB Cooper: The Legendary Daredevil

The hijacking crisis crew on the ground, including Seattle cops, FBI agents, Northwest employees and Federal Aviation Administration officials, had roughly 30 minutes to meet Cooper's demands. The FBI scrambled to assemble the $200,000 cash while Seattle cops worked on the two sets of parachutes.

Cooper had specified $20 bills—an indication of his attention to detail in the planning. He apparently had calculated that 10,000 $20 bills would weigh just 21 pounds. Smaller denominations would add weight and danger to his skydive. Larger denominations would be more conspicuous and therefore more difficult to pass.

Cooper specified the bills should have random, not sequential, serial numbers. FBI agents followed his instructions but made sure each bill began with the code letter L, issued by the Federal Reserve office in San Francisco. Nearly all of the bills were dated 1969. Against a ticking clock, the agents held a hurried session in which each bill was photographed to create a microfilm record of all 10,000 serial numbers.

Meanwhile, the search for suitable parachutes was more difficult than acquiring $200,000 cash.

The task at first seemed simple. Authorities at Tacoma's McChord Air Force Base agreed to provide military-issue chutes. But Cooper—through a flight attendant messenger—rejected the military chutes, which have automatic opening mechanisms. Cooper insisted on civilian chutes, with user-operated ripcords. After a series of urgent phone calls, Seattle cops managed to make contact with the owner of a skydiving school. The business was closed, but the owner was pressed into service. He met officers at the school, and soon a police car with lights flashing and siren screaming raced to Sea-Tac Airport with a precious cargo of four parachutes.

Cooper's hijacking note did not spell out his plan to skydive with the loot, but the authorities were able to deduce his intentions. They puzzled over his request for two sets of chutes. Did he plan to take along a passenger or crew member as an airborne hostage? The question negated any thoughts of using dummy parachutes that would end the hijacking—and the hijacker's life—with a splat. To some, it was another brilliant detail of his plan.

Aboard the jet, Cooper drank a bourbon and water—and, oddly, offered to pay Mucklow for the highball. Cooper's manners and temperament have been the subject of some disagreement. By the FBI's account, he was boozy and rather raunchy. Ralph Himmelsbach, a lead FBI investigator on the case, has said the hijacker used "filthy language" and was "obscene."

Yet Mucklow, who spent more time with Cooper than any other crew member, has described him as a gentleman. She said, "He seemed rather nice. He was never cruel or nasty. He was thoughtful and calm." One example was Cooper's request that meals for the crew be brought on board once the jet was on the ground in Seattle.

Investigators surmised that Cooper was native to the Seattle area or was born in the Northwest and had spent some years around Puget Sound. The Northwest agent at Sea-Tac had discerned no regional accent when Cooper bought his ticket. Cooper had recognized Tacoma from the air while the hijacked jet was circling, and he knew that McChord Air Force Base was 20 minutes from Sea-Tac, based on a comment he made to Mucklow.

He was well-acquainted with skydiving and schooled in jet aerodynamics, including such details as the specs for wing flap angles and minimum air speeds for the Boeing 727. Some believe he was an active or retired airman who had spent time stationed at McChord.