NEW YORK--(BUSINESS WIRE)--Fitch Ratings has assigned a 'AA' rating to the following bonds of the Loudoun County (the county), VA Economic Development Authority (EDA): --$195 million Loudoun County Economic Development Authority, VA metrorail service district improvement revenue bonds (silver line phase 2 project), series 2014. The series 2014 bonds are being issued to provide funds to enable the County to meet its obligation to the Metropolitan Washington Airports Authority to fund a portion o