There is an abundance of information available on the internet about the DB Cooper hijacking. Furthermore, there are many books about the case. This site is not intended to present all the information or evidence available.
FBI documents released in 2017 describing DB Cooper’s visit to Elsinore Skydive Center near Los Angeles in 1971.
Max Gunther wrote about this in 1985 (page 123 in his book). These documents were not released until 2017. How could Max have possibly known about this incident unless he actually spoke to DB Cooper?
FBI document showing a man pretending to be in the movie industry in order to get details of passenger aircraft performance.