Butler National Corporation, together with its subsidiaries, operates in the aircraft and related services market in the United States. The company operates in six segments: Aircraft Modifications, Avionics, Aircraft, Services, Corporate/Professional Services, and Gaming. The Aircraft Modifications segment includes the modification for customer and company owned business-size aircrafts, including passenger to freighter configuration; addition of aerial photography capability; and stability enhancing modifications for Learjet, Beechcraft, Cessna, and Dassault Falcon aircraft. The Avionics segment manufactures, sells, and services airborne electronic switching units used in DC-9, DC-10, DC-9/80, MD-80, MD-90, and the KC-10 aircraft; transient suppression devices for fuel tank protection on Boeing Classic 737 and 747 aircraft, and other Classic aircrafts; and airborne electronics upgrades for classic weapon control systems used on military aircraft and vehicles. This segment also offers consulting services with airlines and equipment manufacturers regarding fuel system safety requirements. The Aircraft segment involves in purchasing, modifying, and selling airplanes primarily Learjets. The Services segment principally provides monitoring and related repair services of water and wastewater remote pumping stations through electronic surveillance for municipalities and the private sector. The Corporate/Professional Services segment offers commercial and industrial building design, and aviation-related engineering consulting services. The Gaming segment offers business management services and advances to Indian tribes. The company was founded in 1960 and is headquartered in Olathe, Kansas.