I used to work overnights at a warehouse near the twin cities but in the suburbs with my father. Random day in the late fall at around 3AM or so my father comes running in the warehouse from outside screaming at everyone to come out there and check this out. We stared up in the sky way into the distance and saw a very weird set of lights. Tough to describe on text but this object was HUGE almost like the size of an air craft carrier way out in the sky so it was small. The lights stayed still for about a min and my father , myself and a couple co workers just gazed in awe. This thing ended up angling in way that resembled a helicopter when it moves aggressively forward... and it slowly flew off out of sight. No sound and decent amount of visibility in the sky to notice it was something pretty crazy. All of us pretty much agreed we saw something out of this world but honestly who knows. This was unfortunately before cell phones had good cameras. Won't forget what I saw though.