Wikipedia had some more interesting info https://en.m.wikipedia.org/wiki/D._B._Cooper https://en.m.wikipedia.org/wiki/D._B._Cooper The Bureau were more skeptic

Wikipedia had some more interesting info https://en.m.wikipedia.org/wiki/D._B._Cooper https://en.m.wikipedia.org/wiki/D._B._Cooper The Bureau were more skeptical, concluding that Cooper lacked crucial skydiving skills and experience. "We originally thought Cooper was an experienced jumper, perhaps even a paratrooper," said Special Agent Larry Carr, leader of the investigative team from 2006 until its dissolution in 2016. "We concluded after a few years this was simply not true. No experienced parachutist would have jumped in the pitch-black night, in the rain, with a 200-mile-an-hour wind in his face, wearing loafers and a trench coat. It was simply too risky. He also missed that his reserve 'chute was only for training, and had been sewn shut—something a skilled skydiver would have checked."[83] He also failed to bring or request a helmet, chose to jump with the older and technically inferior of the two primary parachutes supplied to him,[53] and jumped into a −70 °F (−57 °C) wind chill without proper protection against the extreme cold.[110][111]