VIENNA, Jan 20 (Reuters) - AMAG Austria Metall AMAV.VI has won a multi-year contract worth hundreds of millions of dollars to supply aircraft maker Boeing BA.N with aluminium sheets and strips, it said. "With the success of this contract, the years-long partnership with Boeing will be expanded on the basis of significantly greater supply volumes," it said on Monday. (Reporting by Georgina Prodhan; Editing by Michael Shields) ((georgina.prodhan@thomsonreuters.com; +431 5311 2256; Reuters Messaging: georgina.prodhan.thomsonreuters.com@reuters.net)) Keywords: AMAG BOEING/