Some of those do sound like some sort of plane and it seems to be happening on cloudy days (the plane sounding ones) which could explain the warped sounds.
But some of them. Gosh. I don't know. I've always been a believer in the theory that "we are not alone". Why would we be. IMO it's just not logical that we would be the only living and breathing people-types in the galaxies. Or possibly even on our planet/dimension.
Interesting. Thanks for posting.
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