FILE -- A helicopter takes off from search headquarters, in this Oct. 28, 1976 file photo, to scour the area where hijacker Dan Cooper might have parachuted into two days earlier, in Woodland, Wash. The past has 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, Nov. 24, 2011. (AP Photo, File)