Airlines and aircraft manufacturers are doing everything they can to lower their costs, including lightweighting every component possible, which can improve fuel efficiency. The industry spends more than a hundred billion dollars on fuel every year. While the price of oil is relatively low today, manufacturers and airlines must look ahead to the more than 25-year life span of the average airplane, assuming someday prices will rise again. Cost is a major driver, but the industry is also committed to reducing emissions during flight, and reducing fuel burn from the engine helps achieve this goal. Lightweighting, then, is one of the most important trends in the aerospace industry, and using composites, that can offer the required strength but at lower weight than metals, in manufacturing is a key strategy.