[Kackikat]

I think that documentary on the ‘flying saucer’ being tested might have been the Discovery channel.

http://www.popularmechanics.com/technology/aviation/military/declassified-americas-secret-flying-saucer-15075926

[MHGinTN]

The technology of flight on Earth has been use of air pressure (for lift) or rocket propulsion. A circular craft such as those registered in the 40s and 50s by our radar and observations by our pilots is not using either of those technologies.