The worldÔÇÖs third largest aluminum producer, Pennsylvania-based Alcoa Inc, has announced surprise third quarter profits thanks to an increase in worldwide aluminum demand. The results beat the expectations of analysts, who predicted the Pittsburgh company to post a loss for the period ending September 30. AlcoaÔÇÖs total revenue was up nine percent from the previous quarter, with profits reaching $77 million. Alcoa said that rising demand across several industries, notably the automotive sector, had lifted its revenue compared with the preceding three months.