“D.B Cooper” was a made up name, made up by the FBI. The perp bought the ticket with the name Dan Cooper (no “B”).
The money went to Reno and Vegas to be laundered, some (most?) was lost when he bailed out.
The man’s name was Richard McCoy. He died long ago, but not while jumping out of airplanes.
Dan showed that the FBI actually went to D.B. Coopers house in Southern Oregon while the hijacking was still happening and he was sitting there watching TV at the time... so I can’t figure why that was the name that got attached instead of simply Dan Cooper if they really believed somebody planning to hijack a plane would board it using their real name...