This book presents an original empirical investigation of the market structure of airline city pair markets, shedding new light on the workings of competitive processes between firms. Examining a cross-section of US airline city pairs, Tabacco proposes for the first time that the industry can be understood as a natural oligopoly, each airline market being dominated by one to three airline carriers regardless of market size. The author questions the extent to which airlines deliberately prevent head-to-head competition within city pair markets, and draws intriguing conclusions about...