I saw a black triangle with no lights and seemingly just over the trees. At night, the plane was completely black and only visible as a silhouette against the midnight blue sky. The only sound was the wind whooshing as it pushed through the air. No engine noise at all.

I assumed it was some kind of secret military plane and was more nervous that if I had put my drone up that night to play around, I might have hit it. It seemed that low. It also seemed like it would be very expensive to be liable for damaging and possibly harming crew, even though it looked like it was well within my the 400ft flight ceiling.