3 bright white objects changed direction and shape formation, then merged into 1 oblong object

On 12/28/2020 at 2:45 pm, it was a bright and sunny day with no clouds in the sky.  I was walking outside in my neighborhood that has a lot of pine trees, and when I came to an incline with a clearing of trees that exposed the sky,  I looked up and noticed 3 distinct bright white round objects arranged in a straight line moving west.  As I continued walking, I noticed that the 3 objects began to move around each other as you would move shells in a shell game. They slowed down, almost stopping, then formed a perfect triangle. This is when I tried to take a video, which I got for a second or so until a tree branch obscured my view.  As I moved to an opening to keep watching, the 3 triangular objects merged into 1 oblong object that was now moving in the opposite direction (east). The object kept moving eastward as one oblong object. There was a passenger airplane in the vicinity, that was distinctly and obviously an airplane, unlike these 3 objects that moved, sl! owed, changed shape and direction. I watched the object(s) for about 5 minutes, then kept walking, while they were still present.