...S&P Global Ratings assigned its '##+' long-term rating to the Michigan Finance Authority's (MFA) series 2019B school loan revolving fund (SLRF) term rate revenue bonds. We have also affirmed our '##+' long-term rating on MFA's series 2010D, 2015A, and 2019A SLRF revenue bonds. At the same time, we affirmed our '##+' underlying rating (SPUR) on MFA's series 2010A, 2010B, 2010AC, and 2014A SLRF revenue bonds. These ratings are based on the application of our long-term municipal pool criteria. In addition, we affirmed our '##+' long-term rating on MFA's series 2010A-C and 2014A bonds based on the application of our joint criteria (assuming low correlation) among the authority, the obligor, and the letter of credit (LOC) providers. The outlook, where applicable, is stable. The LOC bank on the 2010A bonds is Bank of America N.A., for the 2010B bonds it is PNC Bank N.A., and for the 2010C bonds it is Bank of Montreal. The 'A-1' short-term rating assigned to the bonds reflects our short-term rating...