Drone / Plane - did not look normal

Stepped outside to have a cigarette around midnight. Right above the tree line I see what at first I think is a very large drone. I think my brain registered it as a drone because of the flight path and height. It appeared to be very low to the ground and moving slow. It almost hovered or drifted like a drone would. However as it approached it appeared to be the size of a large plane... The lights on the bottom of the craft were similar to a plane. White and red lights. But it looked more like a large triangle. It seemed to be moving slowly at a steep assent yet the trajectory doesn't make scene with airports in the area. It was maybe a 1/4 to a 1/2 mile from me moving west.
First time I have seen something so close that I could not explain.