Many researchers believe that the Egyptians knew the aeronautics secrets and could fly but later the secrets were lost.
Egyptian Airplane
In 1898, a 6 inch model of what looks like a glider was found in the tomb at Saqquara. It has been exhibited in a museum in Cario. Was it just a toy or a scale down version of the real aircraft?
Carvings at Abydos
At Abydos, ancient temple built by Seti I and his son Ramses II, there were curious carvings on the stone slabs. They seemed to be the images of aircrafts.
Below are the self explanatory images from the temple wall.
The Wall
Close up from the wall 
Plane?
Plane with a man?
Helicopter ?
Submarine?
Central and South American Shuttle
Models of airplane made in gold were found in the Central and South America. These date back to 500 AD.
From our scriptures
Haven’t we all heard stories from our epics where the Gods and Demigods traveled in Vimanas. Ravana carried away Sita to Lanka in a Vimana, Remember!! Our ancient scriptures describe this aircrafts in depth to the very last technical detail. In “Vaimanika Shastra” (Aeronautical Science), talks about different flying machines and describes in depth the technical details of constructing and flying an airplane.
Interesting? You could read more here:
http://www.2atoms.com/weird/ancient/plane.htm
http://www.geocities.com/jirimruzek/abyhelic.htm
http://www.veling.nl/anne/templars/ancientaircraft_nf.html
