6 rectangular lights in a straight line moving across the sky

I was elk hunting in the mountains near Rollinsville, CO on Monday the 25th of September. At around 2110 hours, I stepped outside of the cabin to brush my teeth. It was a clear dark night with all the stars visible. I was looking at the big dipper when I saw 6 or so rectangular lights appear in a linear formation equidistant apart. They were moving west to east at commercial airliner cruising altitude but faster. I watched them for about 5 seconds or so then they started to disappear one by one. Unfortunately, it happened too fast for me to retrieve my cell phone and take a picture or video.
An investigator can contact me if they wish.