Boeing reported quarterly earnings and revenue that beat analysts' expectations on Wednesday.
KFC parent Yum Brands on Tuesday said first-quarter sales at established restaurants in China, its top market, rose 9 percent.
Dow Chemical, the No. 1 U.S. chemical maker by sales, had a good quarter, reporting a better-than-expected rise in profit.
Delta saw its profit surge last quarter, as passengers defied the brutal winter and flocked to the aircraft carrier.
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