NEW YORK--(BUSINESS WIRE)--Fitch Ratings has assigned an 'AA' to the following bonds issued by the Board of Regents of the University of North Texas System (UNTS): --$146.4 million revenue financing system refunding and improvement bonds, series 2015A; --$75.7 million revenue financing system refunding bonds, taxable series 2015B. Proceeds will fund capital improvements, advance refund a portion of the 2007 bonds, refund the series 2014 bonds, refund a portion of outstanding commercial paper no