User blog comment:ProfDraco2/I! HAVE! RETURNED!/@comment-31772644-20171104081254

I've found a solution to out Cooper parachute problem. When he hijacked tha plane, he asked for four parachutes but only jumped with two. What if one becomes an artifact in full, the second only contributes the ripcord?

Also apparently there's a comic character called Dan Cooper, who pre-dates the heist, and had a story that matches pretty much point for point.