US STOCKS-S&P 500 closes at 10-week high on vaccine hopes, stimulus pledge

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* Delta Air Lines to resume flying major routes in June

* S&P 500 notches best day in nearly 6 weeks

* Cyclicals lead gains among major S&P sectors

* Dow up 3.85%, S&P 500 up 3.15%, Nasdaq up 2.44% (Updates with volume data, market breadth)

By Chuck Mikolajczak

NEW YORK, May 18 (Reuters) – U.S. stocks jumped on Monday, and the S&P 500 closed at a 10-week high, on encouraging early-stage data for a potential coronavirus vaccine and on the promise of

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