ATLANTA — Fitch Ratings on Wednesday upgraded the long-term rating for $121 million of outstanding Series 2003B-1 bonds issued by South Carolina Transportation Infrastructure Bank to AA from A. Fitch also assigned an F1-plus short term rating.

The upgrade comes in connection with the conversion of the interest rate on the bonds to a weekly-rate mode from an auction-rate insured mode, according to a rating report written by Fitch analyst Steven Stubbs, andis based on the support provided by a letter of credit that was issued by Bank of America NA. The remarketing agent for the bonds is Banc of America Securities LLC.

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