S&P Global Ratings affirmed its 'A+' long-term rating on Charleston County Airport District, S.C.'s airport revenue bonds outstanding. The outlook is stable. We used our criteria, titled "U.S. And Canadian Not-For-Profit Transportation Infrastructure Enterprises," published March 12, 2018 on RatingsDirect, to evaluate the bonds. The rating reflects our opinion of the airport's very strong enterprise risk profile and strong financial risk profile. The enterprise risk profile assessment reflects the Charleston International Airport's (CHS) strong market position as a small-hub airport, with strong enplanement growth, but weakened by the modest competition of other regional airports. We also considered the airport's generally favorable enplanement trends, which have increased enplanements to levels we consider sustainable, as a result of serving a growing service