Wall Street flat amid mixed earnings reports

U.S. stocks were little changed on Thursday morning as weak earnings reports from index heavyweights Verizon and Travelers were offset by AmEx's strong showing. Verizon fell 2.8 percent, weighing the most on the S&P, after the wireless carrier reported a drop in quarterly revenue. The S&P 500 telecom services sector tumbled 2.2 percent, the biggest loser among the 11 major S&P 500 indexes.