The Dow Jones Industrial Average fell 27.88 points, or 0.10 percent, to 28,239.28. The S&P 500 fell 1.38 points, or 0.04 percent, to 3,191.14. The Nasdaq Composite Index rose 4.38 points, or 0.05 percent, to 8,827.73.
FedEx shares plunged more than 10 percent after the shipping giant reported weaker-than-expected quarterly earnings.
The company reported adjusted earnings per share of 2.51 U.S. dollars and revenue of 17.3 billion dollars, both lower than Wall Street's estimates.
U.S. airplane giant Boeing Company announced earlier this week that it would temporarily halt production of 737 Max jets beginning in January after U.S. regulators ruled out any clearance for the troubled planes for flight until next year.
Boeing said in a statement that the decision is driven by a number of factors, including the extension of the U.S. regulators' certification process into 2020, as well as the uncertainty about the timing and conditions of return to service.
Bank of America Global Research said in a report on Wednesday it estimates that the stoppage could amount to a 0.5-percentage-point drag on the first quarter U.S. GDP growth.
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