Originally Posted by
jugofpropwash
Question. If he did indeed work in the industry, and had in-depth knowledge of the aircraft - is there anywhere on the plane where he might have hidden, and been overlooked when it was searched after landing?
On the last page of this document collection that I linked to earlier, page 77 of 77:
https://true.ink/story/d-b-cooper-fbi-files-released/
there is a discussion of two areas behind panels near the aft stairs that might be big enough to hide a man.
However, the conclusion was that the stairs had to be 100% down to access these areas and the wind blast presumably kept the stairs from fully extending in flight.