NY -- Standard&Poor's CreditWire 7/20/98 NY -- Standard&Poor's CreditWire 7/20/98 – Standard&Poor's today assigned its single-'A'-plus rating to San Francisco Airport Commission, Calif.'s $250 million second series revenue bonds issue series 18A, 18B, and 19 dated July 1, 1998 due May 1, 2029. The bonds are scheduled to sell July 21, 1998. At the same time, Standard&Poor's affirmed its single-'A'-plus rating on the commission's outstanding revenue bonds. The rating on issues 18A, 18B and 19 bonds reflects the following strengths: -- Greater certainty associated with completion of Near Term Master Plan (NTMP) project budgets, --ýDemonstrated and expected solid economic underpinnings and positive traffic trends projected to slow somewhat in fiscal 1998 over 1997, and -- Strong financial performance and