NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed its 'A' rating to approximately $6.3 billion in outstanding joint improvement revenue bonds, issued by the cities of Dallas and Fort Worth, Texas for Dallas - Fort Worth International Airport (DFW). The Rating Outlook is Stable. RATING RATIONALE The rating reflects the strong demand for air travel in an expanding market, the strategic location of Dallas-Ft Worth to serve as a hub, stability from the recent American Airlines-US Airways merger