This book covers the physics of flight (basic), jet engine propulsion, principles and regulations of aircraft performance and other related topics, always with an innovative and simple approach to piloting and flight planning. This way, a traditionally complex study was made into something fun and easy. The book is focused on class A aircraft performance and is suitable for those who are unfamiliar with airplane performance, as well as for those with some previous background or experience who want to gain a more in-depth understanding of the subject matter. To sum up: pilots (professionals and students), flight dispatchers, aeronautical engineers and aviation enthusiasts. Happy reading!