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For what it's worth:
I was told several years ago by someone I trust that there is a US military aircraft that has an alternative propulsion system that allows it to disable it's conventional engines and cruise at speed totally "dark", no heat signatures and no noise, and that the method of propulsion involved something like applying a significant electrical charge to the leading and trailling edges of the aircraft. I know this guy had a job in the military that would have exposed him to this information in the course of his work, and he was a smart, level headed person.
I've always been interested in secret government projects, especially planes, and the coincidental evidence I've dug up over the years seems to point to electro-gravitics or something similar being a well-developed and classified technology.
I'm leaning towards the drone thing being true.
Incidentally, while we're talking about it, I think that some of the most high-profile UFO sightings of the past and also recently (most notably the USS Nimitz "tic tac" videos) are this technology: https://www.otherhand.org/home-page/area-51-and-other-strange-places/bluefire-main/bluefire/particle-beams-and-saucer-dreams/
Publicly acknowledged (though in a different scope) here: https://www.militarytimes.com/news/your-military/2019/07/19/pentagon-scientists-are-making-talking-plasma-laser-balls-for-use-as-non-lethal-weapons/
Applying a significant electrical charge to leading and trailing edges of a wing can get you silent thrust, but it's not antigravity, it's just a form of ion thruster that uses the atmosphere itself as reaction mass:
https://hackaday.com/2016/07/13/expanding-horizons-with-the-ion-propelled-lifter/
And it's hard to make useful, because the catch is that you'd need about a million times more thust if you even wanted to lift your own power supply rather than be tethered to it. I suppose maybe you could combine the idea with beamed power, but you'd still need line-of-sight to a powerful ground station, and regardless your craft wouldn't resemble an airplane so much as a spiderweb.
You'll notice I didn't use the word "antigravity" in my post, and in general I think the posters here missing the forest for that specific tree and getting a little fixated on it as a literal term.
I think that the tech being public in a more rudimentary form makes it much more likely that it exists in a more capable form on classified projects.
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Check out this video that discusses how an early versions of this tech is potentially used on the B2.
B2 chapter about 30 min in.
https://youtube.com/watch?v=RTEWLSTyUic?si=qczONxEQgg6XfIiP
I'm going to check this out, thanks for posting. FWIW I once straight-up asked a B-2 engineer in a casual setting about this, and he denied it. But perhaps he misunderstood, or was doing his job.
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Bingo.
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