FBI investigates a "credible" lead in the D. B. Cooper case

It has been four decades since a mysterious skyjacker known as D. B. Coooper bailed out of a 727 over the Pacific Northwest with $200,000 in cash. The case remains unsolved.

Kenny Christiansen was put forward as a possible suspect by New York Magazine in an October 21, 2007, article. That was around the time the FBI reopened the Cooper case, though the feds never seriously considered Christiansen as a prime suspect.

Not much has been learned since then, but the AP is reporting that the FBI is currently following up on a "credible" lead:

The recent tip provided to the FBI came from a law enforcement member who directed investigators to a person who might have helpful information on the suspect, FBI spokeswoman Ayn Sandalo Dietrich told The Seattle Times on Sunday. She called the new information the "most promising lead we have right now," but cautioned that investigators were not on the verge of breaking the case.

Authorities have followed up on 1,000 leads since the November 24, 1971, skyjacking.