Alcoa Inc. (from Aluminum Company of America) is an American public company best known for its work with lightweight metals and advanced manufacturing techniques. The worlds third largest producer of aluminum, behind Chinalco and Rusal, the company has corporate headquarters in New York City. From its operational base in Pittsburgh, Pennsylvania in the United States, Alcoa conducts operations in 30 countries. It is one of the worlds largest lightweight metal manufacturers of products made of alu...