This book presents, for the first time, a comprehensive analysis and assessment of the sustainability of the contemporary civil air transport system, examining its three main components: airports, air traffic control, and airlines. It offers an in-depth examination and quantitative insight into the system's current and prospective structure and operations, as well as the related effects and impacts. The sustainability of the air transport system is considered along a global trajectory of growing effects and diminishing and/or stagnating impacts on society and environment under conditions of continuous growth. In doing so, the author examines the situations of users of the system (passengers and freight shippers), air transport operators (airports, air traffic control and airlines), aerospace manufacturers, local and national communities, policymakers and the general public. The book possesses the unique and distinctive feature of providing an analysis and assessment of the air transport system's sustainability through elaboration of its technical/technological, operational, economic, social, environmental and institutional performances and their causality. It is written for advanced graduate and post-graduate students, researchers, planners, stakeholders, and policymakers dealing with the various sustainability issues of the contemporary air transport system.