White cigar shaped object over DIA or Buckley Air force base

My son I were driving at about 4pm on Sunday.  I looked out to the east close to the airport.  I saw a white cigar shaped object that did not appear to move.  Right above it was a half circle shape that was just as long as the cigar shape.  Since I was driving I had my son watch the object and we tried to get a video but we were not able to capture it before I had to turn in the opposite direction.  I thought it was plane but it was very long and should have appeared to move.  It was too long and the shape was even from end to end so It didn’t appear to be a plane coming at us, giving the affect of not moving.  I really wanted to see if anyone else might have seen the object .