Since its creation, NASA has steadily advanced flight within the atmosphere, repeatedly influencing aviation's evolution by extending the rich legacy of its predecessor, the National Advisory Committee for Aeronautics or NACA. The first volume in a two-volume set includes case studies and essays on NACA-NASA research for contributions such as high-speed wing design, the area rule, rotary-wing aerodynamics research, sonic boom mitigation, hypersonic design, computational fluid dynamics, electronic flight control and environmentally friendly aircraft technology. The second volume includes case studies and essays on NACA (National Advisory Committee for Aeronautics) --NASA research for contributions including wind shear and lightning research, flight operations, human factors, wind tunnels, composite structures, general aviation, aircraft safety, supersonic cruise aircraft research adn atmospheric icing.