I think these are foo fighters which have been around since world war 2. The bomber pilots used to see them next to their planes and sometimes they would make the electrical instruments in the planes go haywire.
Its likely they are simply electronically ionizing the air around the sphere and then accelerating it past the sphere cause near frictionless motion. Pretty much everyone has known how they worked since Thomas Townsend brown in the 1960's.
The lifter project even shows you how to make a flying triangle electric vehicle as a school project using tinfoil and a high voltage source.
The hissing and the glow people talk about at night is from the high voltage which ionizes the air. Its also why they look a little out of focus. The air around them literally bends the little like air over hot pavement.
It think all the jet powered military planes we see are very last generation and most actual airciraft are electrically "jetted" in this way. The usa military just hasn't admitted it yet. But I think now everyone knows about this tech and so its starting to appear everywhere so maybe finally the US military will release it to the public so it can be used in civilian life.
It has good radar deflecting effects too since ionized air bends radar so that's another reason the is military probably hasn't declassified it. But I think its pretty well known around the world now thanks to the internet unlike in the 1960'-80's. Lifters were a frequent topic on the internet in the 1990's.
(((duckduckgo)))
Get nose-surgery.
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