The textbook provides answers to many questions related to airplanes and properties of air flight. The first chapter provides a description of aerodynamic forces and deals with concepts such as acceleration, velocity, and forces of flight. The second chapter is devoted to the discussion of properties of the atmosphere. How different characteristics of atmosphere help make flight possible, how man can harness the air for flights, and several other questions related to balancing of forces in the air are discussed in this and the third chapter. The discussion centers, in the fourth and fifth chapters, on how aircraft move through the air. The next two chapters discuss the aircraft structure and various kinds of instruments used to control the flight. A brief description of navigation instruments is also included. The book is to be used only in the Air Force ROTC program. (PS)