Who Was Dan Cooper?

We won't be able to name him, but what can we figure out about the kind of man he was and who would make a good suspect? The fact the money never got reported argues against his survival. Some have suggested that cooper may have been a serviceman who encountered them while stationed in europe. On the other hand, they were sold in canada. So he could have spent time in canada, either as an american living there or if he was a canadian citizen.