How do planes make so much noise after they have flown over / away?

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I live near some flight paths so a lingering sound is normal but recently somewhere else a military style jet flew over head and the sound lasted much longer at a very high volume, long after we could see it anymore – why?

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Anonymous 0 Comments

Same reason a motorcycle is louder after it passes by. The exhaust and the majority of the noise is directed rearward.

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