NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed the 'AA-' rating on approximately $3.1 billion in toll-supported revenue bonds of regional authorities in Texas, based on the enhancement provided by toll equity loan agreements (TELA) between the issuer and the Texas Department of Transportation (TxDOT): --$1.776 billion in Grand Parkway Transportation Corporation (GPTC) Grand Parkway System toll revenue bonds, series 2013B and 2013E; --$1.313 billion in North Texas Tollway Authority (NTTA)