Weird Noise

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Hey all, a couple of days ago, I noticed a weird, low-pitched humming noise when I was sitting in my bedroom reading. It sounded like it was coming from out behind my house and that it was pretty loud. It lasted for maybe 10 seconds or so and then stopped. I couldn't decide what it was. Something mechanical. People doing some sort of landscaping work? It sounded like it could be a deep, rumbling engine noise. Some sort of big truck running? We live near a small airport that is owned by the city for the use of police and fire, and sometimes military stuff comes in. Could it be a plane or a helicopter? I heard it again, several more times. It sounded like it was cycling, so I eliminated vehicles, flying or otherwise, unless it was a truck idling. It seemed more likely to be some sort of equipment. Could be people working, still. But then I heard it later, at night, like LATE at night. Obviously not people working. And sometimes it would go for a lot shorter period of time, like just a couple of seconds. Of course, I did consider that it might be coming from something in my own house or even from my own ears. I've had tinnitus before, although that was a high-pitched noise, not a low one. However, I never heard the noise when I was in my studio (which doesn't face the rear of the house), in my car, or at my friend's house, where I went for gaming yesterday. And when I came back home from gaming, I heard it when I was downstairs, too, so that eliminated my thought that it might be something in my bedroom, like the fan or the hvac system. So, I'm flummoxed. I can't try to hunt down the noise when I hear it, because it doesn't last long enough for me to get up and go outside, especially if I'm upstairs. The only thing I could possibly think to do is to just hang out for a while outside and see if I hear it again and try to figure out where it's coming from. The one weird thing is that it seems like wherever it's coming from, it must be pretty loud, so I wonder how many other people in my neighborhood are also trying to figure out--what the heck is that NOISE?