New York Stock Exchange (NYSE) in Manhattan, New York City, U.S., August 19, 2021. REUTERS/Andrew Kelly Sept 9 (Reuters) - Wall Street"s main indexes opened nearly flat on Thursday after data showed weekly jobless claims fell to a near 18-month low. The Dow Jones Industrial Average (.DJI) fell 17.99 points, or 0.05%, at the open to 35,013.08. The S&P 500 (.SPX) opened lower by 1.05 points, or 0.02%, at 4,513.02, while the Nasdaq Composite (.IXIC) gained 9.43 points, or 0.06%, to 15,296.06 at the opening bell.