New Era of jet fighters

After my last post I was thinking about generation of jet fighters… I wrote  about them last time, and the highiest of these is 5-th, but maybe 6th are now but we don’t now anything because they don’t tell us about them ? What if they contact with some aliens/UFO and change technology ? Of course it’s only one of many theories… I found some photos that can prove this:

BOEING “BIRD OF PREY”

X-47A “PEGASUS”

THE A-12 AVENGER II