UFO seen while I was in an outdoor yoga class staring up at the sky

While staring up at the sky in the savasana position (lying down) in Leahi Park, Honolulu (visiting from NYC) I noticed a dark shape (I think oval) but it had a fire on the undercarriage much like an air balloon would have but the fire was large and took up most of the object. The object was far higher than a plane (there was a plane not too far away) and did not remotely appear to be an air balloon which would explain the fire. Because of the fire, it was difficult to see the object. I had my phone with me so I tried to videotape it, but my iPhone 12 was not good enough to see the object, I could only see sky. The class was deeply silent because everyone was doing savasana so I thought it would be very inappropriate to call out to ask if anyone else saw it. I thought I would ask when the class ended. But then the fireball under the carriage of the object went out and the object (dark, sort of an oval-ish shape) began to fade. I couldn't tell if it was just fading or if it was retreating even higher into the sky. At that point, it disappeared. No sound, no "lights" but it was definitely fire. The nearby plane appeared to be a general commercial airline and had nothing to do with the object.
Investigator free to contact me but not necessary.