CHICAGO--(BUSINESS WIRE)--Fitch Ratings has affirmed Jackson Municipal Airport Authority's (MS) $38 million airport revenue bonds at 'BBB+'. The Rating Outlook remains Stable. KEY RATING DRIVERS The rating reflects a small enplanement base and operational performance vulnerable to carrier decisions. The airport's financial performance has generally been stable due to fee increases despite the recent loss of Southwest Airlines Co. (Southwest, rated 'BBB'/Positive Outlook by Fitch). The authority