A fast-moving object with no audible sound appearing as a bright white light with a slight trail at or around FL150 traveling North.

I had been having trouble falling asleep, so I laid down and looked out my west facing window. I had been still for just a second when I saw a very bright white light in the shape of a sphere moving at a fast speed traveling north across the sky outside my window. I noticed a slight trail effect behind it as well. I did not hear any noise and lost sight of it behind a neighbor’s tree/house. It happened in an area near a large international airport, though I’m familiar with the area and would recognize a standard passenger aircraft. To double check, I opened my flight tracker just seconds after the sighting to confirm what I had just seen. As I found no planes moving that direction in the area, I concluded it wasn’t one. I opened my other app “stellarium” just to make sure it couldn’t have been a satellite. Knowing that I have never see a satellite at my location due to light pollution, I knew it wasn’t one but still checked. Again, I found no evidence to disprove what I saw.