UPDATE: Why Are People Hearing Strange Jet-like Sky Sounds, But Not Seeing Planes?

“I heard what sounded like a military powered jet engine at full power for about 5 seconds then it would abruptly stop.  The noise would start again every 5 seconds then stop again 5 seconds continuing like this for a couple minutes.” — U. S. government employee in Colorado, who requests anonymity “I took my …

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