Strange Rumble Noise over City?

Its 2 AM and I heard a loud rumble noise pass over my house. It sounded like jet plane was flying 20 feet over my house. I look out the window and see nothing. I could hear the rumble for about 1min it woke up all the dogs in the area and make them bark. 30min later I hear it again and look out my window and see what looks like a fighter jet(Not sure it was pretty far away) flying about what looked like no more then 40 mph. It was a good 3/4 mile away and the noise was crazy loud. The noise does not really sound like a plane but it was close. It did not sound like anything I have ever heard. Anyone got any idea what it is?