Current developments in the field of air navigation services have been comprehensively described in this well-structured book. The division of air navigation services entered a new era of performance scheme that aims to meet requisite targets in four fundamental performance areas of safety, capacity, eco-friendliness and cost-efficiency. While it is highly expected that the targets are completely achieved, it is not recommended how; this being characteristic of performance based and goal oriented regulations. These key performance regions are interconnected by proportional and inversely proportional interrelations. For instance; if one aspires to expand sector capacity using the existing human resources (constant staff costs) but does not invest in technology (constant support cost) to accomplish higher cost-efficiency of service provision, the consequent overloaded system might unlock the Pandora's box of underlying safety issues. Since there is no scope of failure, we - the common, migrating and traveling public, airspace users, airport operators, air navigation services providers and the economy - will only benefit from this system; achieving goals of performance scheme in the process. However, the fundamental question which remains unanswered is "What is the winning strategy?" This book provides an understanding of noteworthy oddities of the elements of new business models of air navigation services provision as advancement of the latter became vital.