Then it should be easy for you to prove prove that all the ufos reported in the last century were nothing more than airplanes without flaps.
Otherwise it's just another BS theory. Right up there with ETs, interdimensionals and weather balloons.
Why do I have to prove ALL of them?
Most UFO are simply unidentified prosaic phenomenon like weather balloons, Swamp gas , radio controlled drones, meteors, ball lightning, etc.
Requiring ALL sightings to fall under one umbrella 🌂is extremely irrational.
By calling boundary layer control experiments “airplanes without flaps” , you betray your own ignorance of the technology, such as related sinterization processes and how it conquers skin friction drag.
Apply some rational thinking here, as well as some good common horse sense.
So... you ARE calling the aeronautical luminaries Ludwig Prandtl and Oscar Schrenk to be NAZIs. And all without reading the pertinent material.
With cognitive abilities as weak as you have demonstrated, it’s easy to see how you would fall for that nonsense extraterrestrial hypothesis.