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Watching tv thought i heard what was a high altitude jet outside but the sound was not dissipating, our dog barked at the door and went outside to listen. sound sustained above our house and went away in about 10 minutes. characteristic was a humming pulsing jet-like sound that lasted approximately 10 minutes in duration. came back inside and my wife said she heard it from our bedroom upstairs. the sound was more distinct listening to it outside.