U.S. stock benchmarks on Thursday were trading modestly higher as a trade meeting between President Donald Trump and China's leader Xi Jinping was set to get under way. A stumble in shares of Boeing Co. on reports that additional computer issues with the aeronautics and defense contractor's controversial 737 MAX fleet was dragging down the broader market. The Dow Jones Industrial Average was flat at 26,548, the S&P 500 index climbed 0.3% at 2,922, while the Nasdaq Composite Index advanced 0.5% at 26,537. HealthEquity Inc. is buying WageWorks Inc. in a deal the companies are valuing at about $2 billion. In economic reports, a final reading of gross domestic product for the first quarter showed that growth remained at a strong 3.1% annual rate, while initial jobless claims, a proxy were a seasonally adjusted 227,000 in the week ended June 22, up 10,000 from the week before, the Labor Department said.