Loud and very brief. Way too brief in my location for me to get outside. As a veteran of the Air Force, I have never heard any type of aircraft, no matter how fast its speed, that resulted in such a brief sound.
PS: perhaps one of those never seen chemtrail aircraft flying at low altitude so as not to produce a visible chemtrail? Who knows? Or it was experimenting with a newer cloaking device. We will never know.
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