This German aerospace engineer developed the design for delta wing aircraft.

The correct answer is Alexander Lippisch, who is renowned for his pioneering work in aerodynamics and his significant contributions to the development of delta wing aircraft. Lippisch’s designs were characterized by the use of a triangular wing shape, which offered enhanced performance at high speeds and improved stability and control. His concepts became influential during and after World War II, particularly as the aviation industry began to explore new configurations that could optimize flight characteristics.

Lippisch's delta wing design was instrumental not only in military applications but also in civilian aviation and space vehicles, showcasing the versatility and efficiency of this wing configuration. His innovative approaches to aircraft design laid the groundwork for many modern aircraft that incorporate delta wing features, demonstrating the lasting impact of his work in aerospace engineering.