During WW2 & afterwards, extensive fighter-plane research continued & was eventually picked up by, Avro. Then by the early 1960s the Avro projects were shut down.
http://www.youtube.com/watch?v=cjWHrPYvUo0
The Avrocar_(aircraft) story. http://www.avrocar.com/synopsis.html, http://www.avroland.ca/al-vz9.html
The Silverbugs. http://www.youtube.com/watch?v=ogg10GjyLR4&feature=fvw,
http://www.virtuallystrange.net/ufo/mufonontario/avro/avrocar.html, http://www.nationalmuseum.af.mil/factsheets/factsheet_media.asp?fsID=10856,
http://en.wikipedia.org/wiki/Avrocar_(aircraft)#Operational_history
http://www.avroarrow.org/Avrocar/Avrocar.html,
http://upload.wikimedia.org/wikipedia/en/f/fc/Avrocar_schematic.jpg, http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=10856
By developing disk-jet & helicopter disk crafts, a cover and diversion was established.
Wright-Patterson_Air_Force_Base#Project_Blue_Book_and_Hangar_18,
http://www.kopp-verlag.de/Ufos.htm?websale7=kopp-verlag&ci=000099
Eventually there is a transition from rotors & jets to Electrogravitics.
http://www.youtube.com/watch?v=D5QdrXkMeMI&feature=related, http://www.abovetopsecret.com/forum/thread18541/pg1
Dr. Paul LaViolette,
http://www.etheric.com/LaVioletteBooks/Book-ES.html, http://www.theorionproject.org/en/movingbeyond_laviolette.html, http://www.starburstfound.org/downloads/aerospace/NASA-SEOP.pdf, http://www.etheric.com/LaViolette/mythology.html
Developing crafts that can withstand the pressures of the deepest oceans, as well as the cold vacuum of space has been a long term goal.
http://www.newscientist.com/article/mg20727671.000-from-sea-to-sky-submarines-that-fly.html?full=true#.UdwPGfmceSo
Operation Seahorse
http://jfvrinfo.blogspot.ca/2009/07/operation-seahorse-etc.html