CONCEPTS / SPECULATIVE
New aircraft under development, proposed designs that never were, and flying machines that may or may not exist…
(For spacecraft concepts, see Space)
Early Lockheed A-12 design (article link)
Northrop ATF competitor, production version (article link)
Northrop Grumman RQ-180 UAV (article link)
Boeing JSF competitor, production version (article link)
Lockheed stealth bomber proposal (article link)
Grumman Super Tomcat 21 proposal (article link)
Hermeus hypersonic aircraft
Images courtesy Hermeus Corp.