Butler National Corporation operates in the Aerospace and Services business segments. The Services segment includes electronic monitoring of water pumping stations, temporary employee services and management services for Indian gaming enterprises. Aerospace includes the manufacture of switching equipment for Boeing aircraft, fuel tank protection devices for aircraft, and structural modifications to business and commercial aircraft. Butler National Corporation was established in 1968 through the merger of an aviation research firm owned by the Butler family and National Connector Corporation. Butler National combined resources of these two companies to develop one of the first commercial Area Navigation System (RNAV) used for airplane navigation.