NEW YORK--(BUSINESS WIRE)--Lightweight metals leader Alcoa (NYSE:AA) today reported solid second quarter 2015 results as the Company’s transformation showed strong progress. Profitability from Alcoa’s growing aerospace and automotive businesses increased year-over-year as mid and downstream investments delivered positive impact. In the upstream, the Primary Metals business was resilient in the face of market headwinds and the Alumina business delivered its strongest first half results in eight


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