General Electric Company, doing business as GE Aerospace, is a global aerospace propulsion, services, and systems company. It has an installed base of over 50,000 commercial and 30,000 military aircraft engines. Its segment includes Commercial Engines & Services and Defense & Propulsion Technologies. Commercial Engines & Services segment designs, develops, manufactures and services jet engines for commercial airframes, as well as business aviation and aeroderivative applications. Its services include maintenance, repair and overhaul of engines and the sale of spare parts and offers services under a variety of arrangements such as long-term service agreements, spare parts agreements or time and material contracts. Defense & Propulsion Technologies segment provides defense engines and critical aircraft systems and consists of Defense & Systems and Propulsion & Additive Technologies businesses. Its portfolio of brands includes Avio Aero, Unison, Dowty Propellers and Colibrium Additive.