Dec 18 (Reuters) - Wall Street securities analysts revised their ratings and price targets on several U.S.-listed companies, including Knight Transportation, Hibbett Sports and Pentair, on Friday. HIGHLIGHTS * Accenture : BMO raises price target to $110 from $105; rating market perform * Delta Air Lines Inc : Deutsche Bank, Evercore ISI raise price target * Dick's Sporting, Hibbett Sports : B. Riley starts coverage with neutral * Pentair : RBC, Canaccord Genuity c