LMI Aerospace, Inc. provides design engineering services, structural assemblies, kits, and components to the aerospace, defense, and technology markets primarily in the United States. It operates in two segments, Aerostructures and Engineering Services. The Aerostructures segment assembles, kits, fabricates, machines, finishes, and integrates close tolerance aluminum and specialty alloy components, and sheet metal products primarily for commercial, corporate, regional, and military aircraft. Its aerospace products include leading edge wing slats and flapskins; winglets and related wing modification kits; fuselage and wing skins; helicopter cabin and aft section components and assemblies; wing panels; door components, assemblies, and floorbeams; thrust reversers and engine nacelles/cowlings; cockpit window frames and landing light lens assemblies; interior components; structural sheet metal and extruded components; auxiliary power units; housings and assemblies for gun turrets; and various components and assemblies.This segment also offers value-added services related to the design, production, assembly, and distribution of aerospace components, as well as delivers kits of products. The Engineering Services segment provides wing/wingbox, fuselage, and empennage design; winglet design; nacelle, engine cowl, and thrust reverser design; weight improvement engineering; aircraft modification engineering; systems design and integration; tool design and fabrication; aviation training system; aviation maintenance engineering; and aviation system software engineering. It produces components and assemblies for laser equipment used by semiconductor and medical equipment manufacturers in the technology industry, as well as provides prototyping and design capabilities to support new product development. The company was founded in 1948 and is headquartered in St. Charles, Missouri.