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 fell 17.99 points, or 0.05%, at the open to 35,013.08. The S&P 500 opened lower by 1.05 points, or 0.02%, at 4,513.02, while the Nasdaq Composite gained 9.43 points, or 0.06%, to 15,296.06 at the opening bell. (Reporting by Shreyashi Sanyal in Bengaluru; Editing by Anil D’Silva)