S&P Global Ratings assigned its 'AA-' long-term and underlying ratings (SPUR) to Washington Metropolitan Area Transit Authority, D.C.'s (WMATA or the authority) $200 million gross revenue transit bonds series 2017A-1 and A-2. In addition, S&P Global Ratings affirmed its 'AA-' rating on the authority's gross revenue transit bonds outstanding. S&P Global Ratings also affirmed its 'aa-' stand-alone credit profile (SACP) and 'AA-' issuer credit rating (ICR) on WMATA. The outlook is stable. The ratings reflect our view of WMATA's: Very low industry risk, with low cyclicality and volatility of earnings during economic cycles, and very low competition; Extremely strong economic fundamentals, with high per capita income and good growth in population and employment; Very strong financial flexibility, with a farebox