NEW YORK (TheStreet) -- A pair of Wall Street upgrades allowed American International Group and Southwest Airlines to buck the bearish trend and end trading as the best-performing stocks in the S&P 500 on Wednesday. The S&P 500 dropped 14.42 points, or 1.02%, Wednesday to 1,398.96, as the Federal Reserve's "no new quantitative easing" message and renewed Eurozone worries sent the markets into selloff mode. Shares of American International Group rose 5.34% to $32.52.