Sources

Day, Philip J., director. The Skyjacker That Got Away: D.B. Cooper (Full Episode) | Undercover History. National Geographic, https://youtu.be/nKu_3kp_EIY?si=1xvitrxsC6laAzWR. Accessed 2022. 

YouTube, LEMMiNO, director. The Search For D. B. Cooper, 2020, https://youtu.be/CbUjuwhQPKs. Accessed 2020.