Cluster of potential UFOs

In the middle of the day (sparse cloud coverage but otherwise bright, blue sky) my friend and I were down at the park near my house and we were just looking at the clouds and we see this collection of about 8/9 tiny dots in the sky.  They were too small to capture on camera and we didn’t have a telescope or binoculars.  They were above cloud level and sort of bright/reflective and a couple seemed to have red lights on the bottom.  There were two more close by but not part of the cluster.  As we watched them the would move closer together and then spread out again and at one point formed a triangle formation (like birds or airplanes might).  They eventually moved out of sight behind the clouds and we didn’t see them any more.  The whole event lasted about 30 minutes.  Afterwards we saw a couple planes fly past that were much, much closer to earth.