Triangular shape with 5 lights moving South steadily.

I was with a group of friends walking to a dinner location in Bricktown OKC. We were in a large wide alleyway when something made me look up at the sky. My location was overcast with a large amount of light pollution. When I looked up I saw 5 lights in a triangle/boomerrang form moving south. I had a hard time judging speed or size but I believe it to have been moving as fast as a normal plane and at least the size of a large passenger plane if not MUCH larger. There were no blinking lights and no changing of the color of the lights. The 5 lights appeared to be a single craft due to the uniformity of the flight path of the lights. I was only able to see it for roughly 10 seconds because as it moved South it disappeared incrementally into the overcast sky. By the time I realized what I was seeing and yelled to my friends it was entering the overcast sky and was hard to see before it completely went out of sight a couple seconds later. There was no sound that I could hear from my position, it was unlike any plane I have ever seen, and I have no idea why I looked up when I did. Our group was taking photos JUST prior to seeing the lights and all the photos were coming out blurry. Could have been a coincidence but the timing seems strange. I am a 36 year old male, father of two, college degree, mid-manager, and this is my first experience with something of this sort.