It's dirty and it's old, but a piece of cloth found in a Washington field might hold the key to solving one of the FBI's most enduring mysteries.
On Nov. 24, 1971, an unassuming man wearing a business suit and appearing to be in his mid-40s allegedly hijacked and threatened to blow up a Northwest Orient Airlines plane traveling from Portland, Ore., to Seattle if he did not get four parachutes and a $200,000 ransom.
When the plane landed in Seattle, the suspect, known only as Dan Cooper or...
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