The document summarizes some key facts about the airline industry: - Airlines have very high fixed costs that make up 70-80% of their total costs, and it is difficult for airlines to quickly adjust their costs when demand decreases. - Profit margins in the industry are thin or nonexistent due to competitive pressures and the commodity nature of air travel. - Government regulation has had and continues to have an enormous influence on the industry through infrastructure, taxation, foreign investment rules, and other policies. - Price has emerged as the main driver of consumer choice in deregulated markets as the industry struggles with differentiating its commodity product and service.