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By the end of the 1930s, NACA aerodynamicists had turned their attention to laminar-flow airfoils (laminar flow relates to the smooth flow of air over a structure). The laminar-flow airfoils (NACA's six series) were shaped with their maximum thickness far back from the leading edge. The first aircraft to use the laminar-flow airfoils for their low-drag qualities was North American's P-51 Mustang, and they are still used quite extensively today on many high-speed aircraft.