SEATTLE (AP) - It's been a rich year for students of D.B. Cooper, the mysterious skyjacker who vanished out the back of a Boeing 727 wearing a business suit, a parachute and a pack with $200,000 in ransom money 40 years ago Thursday.
An Oklahoma woman came forward to say Cooper may have been her uncle, now deceased. A new book publicized several theories, including one that Cooper was a transgendered mechanic and pilot from Washington state. A team that includes a paleontologist from Seattle's Burke Museum released new findings this month that particles of pure titanium found in the hijacker's clip-on tie suggest he worked in the chemical industry or at a company that manufactured titanium - a discovery that could narrow the field of possible suspects from millions of people to just hundreds.
Nevertheless, no one's been able to solve the puzzle, or even determine whether Cooper survived his infamous jump.
"This case is a testament in a way to our enduring fascination with both a good mystery and a sense of wonderment - mystery because we still don't know who this guy was, and wonderment that a guy could do something this bold - or stupid," says Geoffrey Gray, whose book, "Skyjack: The Hunt for D.B. Cooper," came out in August.
On Nov. 24, 1971, the night before Thanksgiving, a man described as being in his mid-40s with dark sunglasses and an olive complexion boarded a Northwest Orient Airlines flight from Portland to Seattle-Tacoma International Airport. He bought his $20 ticket under the name "Dan Cooper," but an early wire-service report misidentified him as "D.B. Cooper," and the name stuck.
He sat in the back of the plane and handed a note to a flight attendant. She was so busy she didn't read it until after takeoff: "Miss, I have a bomb and would like you to sit by me."
He opened his briefcase, displaying a couple of red cylinders, wires and a battery, and demanded $200,000 in cash plus four parachutes. His demands were granted at Sea-Tac, where he released the 36 passengers and two of the flight attendants. The plane took off again at his direction, heading slowly to Reno, Nev., at the low height of 10,000 feet. Somewhere, apparently over southwestern Washington, Cooper lowered the aircraft's rear stairs and dove into a freezing rainstorm - a jump so daring that even some of the police who scoured the area reportedly said they hoped he got away.
No sign of Cooper has ever emerged, but a boy digging on a Columbia River beach in 1980 found three bundles of weathered $20 bills - Cooper's cash, according to the serial numbers.
A few events are planned for Saturday to mark the anniversary, including a Cooper symposium (http://huntfordbcooper.com/) at a Portland, Ore., hotel, where sleuths will present their latest findings and theories - and serve as jurists for a Cooper-themed poetry contest.
Carol Abraczinskas, a scientific illustrator at the University of Chicago, said she plans to present the results of her three-year study of the French comic "Dan Cooper," a series about a test pilot in the Royal Canadian Air Force which may have been the source of the hijacker's pseudonym.
In one issue from 1963, she noted, the character boards an airliner wearing a dark suit and a mask over his eyes and sits in the back of the plane. He demands to be given a briefcase that's in the cockpit, and then, wearing a military parachute, he jumps out of the plane - over a wooded area, at night, in the rain.
"I'm looking at this as, are these comics a possible blueprint for the hijacker?" Abraczinskas says.
The cartoon was published in French Canada and in Europe and was never translated into English. That raises questions about whether the hijacker was a francophone, she said.
Also among those planning to attend is Marla Cooper of Oklahoma City, who disclosed this year that she had provided a tip to the FBI about her deceased uncle. Relying on childhood memories, she recalled that her uncle Lynn Doyle Cooper had arrived at a family home in Oregon with serious injuries and that she overheard him talking about the hijacking.
Cooper says she's optimistic the FBI will be able to match her uncle's fingerprints to those involved in the case. The agency has said DNA testing did not match samples on the hijacker's necktie, but that the finding did not necessarily rule out the lead.
"It looks rather promising that this case could very well be solved in the next few months," Marla Cooper said.
Other Cooper enthusiasts aren't so sure. Agents discovered numerous partial fingerprints on an in-flight magazine, but it's unknown if any of those was Cooper's. He appeared to be careful not to leave fingerprints and demanded the flight attendant return the bomb note he had given her.
Partial DNA samples were recovered from the plane, including on the clip-on tie that was left on the hijacker's seat, but no one knows if the samples came from Cooper. The items that might have provided a definite DNA profile - the eight filter-tipped cigarette butts he chain-smoked during the flight - apparently went missing while in FBI storage in Las Vegas.
Many people, including Ralph Himmelsbach, the FBI's lead agent on the case until his retirement in 1980, believed Cooper could not have survived. The temperature at 10,000 feet was 7 below zero, not including the minus-70 wind chill, and even if he survived the jump, he probably landed in the Columbia River or in rugged, wooded mountains at the onset of winter with no outdoor gear.
Tom Kaye, a paleontologist at the University of Washington's Burke Museum, said his presentation at the symposium will suggest Cooper lived. The three bundles of money that were found on the Columbia River beach at Tena Bar were about 20 miles east - that is, upstream - of what Kaye believes was the plane's flight path. If that's so, the bundles couldn't have gotten there "without mechanical or human intervention," he said.
That the bundles of money were found together suggests they didn't wash down to that spot from a tributary upstream, as others have suggested, he argues.
With the FBI's blessing, Kaye's team (http://www.citizensleuths.com) tested the tie and discovered the microscopic slivers of pure titanium. At the time, he said, titanium was much rarer than it is today. Titanium alloys were used in aircraft parts, but pure titanium was found only at companies that made pure titanium or at chemical companies which used it because of its corrosion resistance.
Of course, that doesn't mean the hijacker worked at one of those companies. He could have purchased the tie at a thrift shop just before the flight.
Following the symposium, some participants plan to head 39 miles north to a familiar stomping ground - the Ariel Store and Tavern in Ariel, Wash., in the heart of Cooper country. The store, which has hosted an annual Cooper celebration for 22 years, has a replica of the chute Cooper used hanging from its ceiling. It also has the sign from the aft stairwell warning not to open it during flight; the sign ripped off when Cooper opened the door and was found by a hunter many years later.
Bryan Woodruff, the 52-year-old son of the owner, said that a week before the 20th anniversary, a man stopped in the store and looked around. He was a dead ringer for the FBI's composite sketch of the suspect.
"There were 7 or 8 of us sitting there, and this guy come in and got a pop and a candy bar," Woodruff recalled. "The guy said he was travelling from Portland to Seattle for business, but why would he come out 10 miles from the highway to get a pop and a candy bar? We just all sit here going, wow, was that him?"
The man hasn't been back since.
AP writer Mike Baker contributed from Olympia, Wash.