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What Sarettah said.
Sound travels at 332 meters per second (about 720 miles per hour) which sounds fast, but not if its a super sonic jet. The sound you hear is seconds old, and the jet is probably out of visual range by the time you hear it.
Do this: Pickup up an SDR Radio (about $30 on Amazon), connect it to your PC and grab one of the free SDR Softwares out there and you'll be able to hear the aircraft coming soon enough for you to run outside and see it for yourself.
If you hear something like this at the same time, better head to your bunker.
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