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The threshold of pain is about 125db.
140db will damage your hearing with brief exposure. So for BRIEF exposure it can hurt, but not do any damage.
140db, the damage threshold, is about 100 feet from a jet. You were probably at least a thousand feet away, so you're probably okay.
That assumes you heard engine noise, not the CRACK of a sonic boom from a jet going supersonic. A sonic boom can reach 200db.
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