Understanding the root causes of airspace constraints, developing strategies for mitigating their impact, and anticipating future airspace closures, are critical for the efficient and safe operation of any airline. This book uniquely examines the technological, geographic, regulatory, and political aspects of airspace closure, with a focus on how airlines continue to adapt to overcome these challenges, providing readers with a framework for identifying issues and solutions in a systematic manner. Filled with historical references and contemporary anecdotes, the book serves both as a practical guide and strategic resource for airline managers navigating their 21st century.