UFO Sighting flying at about 30,000 feet, approx. 3,000 mph. No aviation strobe lights or wingtip lights. UFO moving very fast. no airplanes overhead verified with flight tracker app. No sound. No sonic boom. No contrails, no heat signature, or glowing fuselage. Consistently appears as a hexagon with a black hole center. Very well-defined features. Possible gravity-bending warp drive or propulsion system that bends light. Mutual UFO Network CMS# 118602 Harlington Texas 10/08/21. This region has had 6,442 Reported UAP UFO Sightings to date.