The pre-columbian Quimbaya culture were expert Goldsmiths – look at this picture of the golden airplane! It is interesting that scale replicas of the golden flyer were built 5 times larger and tested precisely.
Vintner, J. “Quimbaya Gold Airplane Artifacts ~300CE.” MysteryPile Ancient Mysteries and Unexplained Phenomena of Our Ancestors. Web. 20 Apr. 2012.