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The Al-Li products offer opportunities for significant improvements in aerostructural performance through density reduction, stiffness increase, increases in fracture toughness and fatigue crack growth resistance, and enhanced corrosion resistance. However, previous generations of Al-Li alloy products (e.g., 2090-T81 plate, 8090-T86 plate, and 2091-T84 sheet) exhibited significant in-plane and through-thickness anisotropy in mechanical properties. These yielded undesirable design and manufacturing characteristics such as crack deviation and microcracking during cold hole expansion. In addition, they showed low short-transverse fracture toughness, poor corrosion resistance, and poor thermal stability. In this article, the results of intense research and development (R&D) are discussed to demonstrate the understanding of the underlying metallurgical causes for the undesirable characteristics. This work has culminated in key alloy design principles that have led to the successful development and commercialization of the 3rd generation Al-Li alloys with highly desirable combinations of properties. The evolution of key properties for upper wing, lower wing, fuselage, and space applications is discussed. These new Al-Li products, in combination with advanced design concepts, offer opportunities for improved structural performance for next generation aerospace applications. 2b1af7f3a8