UFOs amused by July 4th fireworks over Lincoln, NE?

We were at a friend's home a few miles outside of the city limits of Lincoln, Nebraska.  We were looking out at the night sky (there were fireworks going off above the city out in front of us).  
We then noticed a cluster of 5-7 lights high above us.  These were DEFINITELY NOT fireworks.  Nor were they stars.  And though I certainly could not completely rule out conventional aircraft, whatever were behind these lights moved (slow, hovering, basically in formation) unlike any conventional aircraft I'm aware of.  They also seemed to be very large.  
We watched them for a few minutes and then they were gone.  
My feeling has always been that these were 5-7 separate crafts...possibly amused -- or annoyed -- by the fireworks occuring on the ground.  Ironically, my nephew also claims to have saw a UFO on a more recent 4th of July.