S&P Global Ratings assigned its 'BBB+' long-term rating to the Metropolitan Transportation Authority (MTA) of New York's proposed $700 million series 2021A transportation revenue bonds (TRBs), using its "Global Not-For-Profit Transportation Infrastructure Enterprises" (TIE) criteria (published Nov. 2, 2020). The outlook is negative. The 2021A bond proceeds will be used to finance existing approved transit and commuter projects; pay capitalized interest on the 2021A bonds; and pay certain financing, legal, and miscellaneous expenses. At the same time, we affirmed the following: 'BBB+' long-term rating and underlying rating (SPUR) on the MTA's TRBs outstanding; 'SP-2' short-term rating on the MTA's previously issued TRB bond anticipation notes (BANs); 'AA-/A-1+' dual ratings on various MTA variable-rate TRBs with enhancement by letters of credit