Wall Street’s main indexes opened higher on Thursday after weaker-than-expected producer prices data eased concerns about a faster pace of interest rate hikes from the Federal Reserve, while Delta Air Lines led gains among carriers on strong earnings. The Dow Jones Industrial Average rose 22.17 points, or 0.06 percent, at the open to 36,312.49. The S&P 500 opened higher by 7.21 points, or 0.15 percent, at 4,733.56, while the Nasdaq Composite gained 56.65 points, or 0.37 percent, to 15,245.04 at the opening bell.