Given an avoidance of a major slowdown in the global economy, the aviation industry looks set for another good year. The commercial jet order book stands at nine years' worth of last year's delivery rates, and aluminium supplier Alcoa just forecast 8% to 9% global sales growth for the industry. Meanwhile, a leading industry body, the International Air Transport Association (IATA), recently predicted 10% net profit growth for the worldwide airline industry in 2016. However, many leading aerospace companies are giving modest outlooks for 2016. Why is this so, and could there be hidden upside in the sector?