(CNBC) Stocks posted strong weekly gains as investors cheered renewed optimism on the U.S.-China trade front on Friday.
The Dow Jones Industrial Average was up 136 points as Boeing shares turned around to trade 1.6 percent higher. Boeing's turnaround was sparked by a report saying the company planned to roll out a software upgrade for its 737 Max aircraft. The stock had been under pressure all week after an Ethiopian Airlines flight using a 737 Max plane crashed on Sunday, which prompted several countries to ground flights involving the plane.
Gains in the tech and materials sectors pushed the S&P 500 up 0.5 percent. Tech shares also bolstered the Nasdaq Composite, which climbed 0.9 percent.
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