A brief but descriptive testimony of a "very large" craft with "three bright lights in the shape of a triangle" north of Dallas has been reported to NUFORC (case 133573).
Low Flying Triangle
Triangle UFOs have been reported constantly by people in Texas and the broader United States for nearly a year now (the waves began in the summer of 2016). Scroll down for a few recent reports.
Recent triangle UFO videos in the US: