New York (AP) — U.S. stock indexes are falling in morning trading Wednesday, as Wall Street’s tumultuous month continues to churn. The S&P 500 was 0.6% lower after giving up an earlier gain, the latest erratic trading for a market dominated by several sudden turns of momentum recently. The Dow and the Nasdaq were also down. Nike jumped to one of the biggest gains in the S&P 500 after reporting stronger profit than analysts expected. Airlines and other companies that would benefit from a reopening economy rose slightly. But several Big Tech stocks are weakening, the latest drops in their September swoon.