'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.'
Source
Besides committing the obvious crime, ole' Dan Cooper ... erroneously labeled "D. B. Cooper," seems to have committed suicide in his attempt at hijacking?
Although the $200k, minus the $5.8k found in 1980, has probably been recycled a few times by Ma Nature and her critters; anyone living near the Columbia River in the area where this historical crime transpired could have an interesting Spring/Summer with an influx of "Indy Jones" types looking to "break the case."
