Circular object with multiple red, blue and green flashing lights making very tight turns at a fast rate of speed.I was sitting at a park near Pomona California at approximately 8:35pm with a friend and my dog watching a music video on my phone, when my friend frantically kept telling me to look at this object flying to the west of us. He asked me if it was a drone. When I did look I saw a circular object with multiple red, blue and green flashing lights moving NW just above the flight path of jets taking off from Ontario Airport in the San Bernardino County.I told my friend it can’t be a drone because it’s too close to the airport and that’s when the object stopped and went back heading SE for about 5 seconds, and then started making very tight circles at a fast rate of speed.As the object was doing these maneuvers in the sky there were jets taking off from the Ontario airport and knowing that when the jets do take off they hold at 5,000 ft until cleared to make their turn away from the airport. This object was above the jets at about an altitude of 15,000 ft. There is also a flightpath going west to LAX and those jets fly at 30,000 ft. These jets were definitely very high above this object.The object continued moving NW to East and South in tight maneuvers including going up and down about 5,000ft. Judging by the flashing lights of the object compared to the jets that were taking off and other jets that were very high up the object had flashing lights that did not resemble the lights on the jets plus the lights were very bright.We watched this object for about a good 5 minutes, until it started going SW at a very steep angle up, and it was out of sight in about 6 seconds.