English: The Power for Flight is a survey of NASA’s work in aircraft propulsion from its origins as the National Advisory Committee for Aeronautics (NACA) to the early 21st century. It introduces NASA’s role in the technology while taking into account economic, political, and cultural dimensions. In these pages, you will meet members of a national aeronautical community that shaped aircraft propulsion. The dramatic development and use of aircraft propulsion technology were the result of a communal response to challenges and concerns that tell us much about the priorities, goals, and determination of a society that needed engines and related systems for military, commercial, and general aviation.