SEATTLE (AP) — This week marks the 40th anniversary of the infamous D.B. Cooper skyjacking case, and enthusiasts are coming to the Pacific Northwest to celebrate.

It was on Thanksgiving eve, 1971, when Cooper took $200,000 of ransom money and jumped out the back of a hijacked Boeing 727 into a freezing rain over southwestern Washington. The hijacker's identity and fate remain mysteries.

Nevertheless it's been a rich year for Cooper sleuths. An Oklahoma woman came forward to say it may have been her uncle. A new book publicized several theories, and a research team released findings suggesting Cooper worked in the chemical industry.

Some of the new findings will be presented during a symposium in Portland Saturday. The Ariel Store and Tavern in Washington also plans its annual bash later Saturday.