The principal activities of Hong Kong Aircraft Engineering (Haeco) are the maintenance, modification, repair and overhaul of commercial aircraft and their components. These activities are carried out through three divisions: line maintenance, base maintenance, and components and avionics overhaul. Under its line maintenance division, it provides a comprehensive range of technical and non-technical services to airlines operating through Hong Kong International Airport. Through its base maintenance division, it provides customers comprehensive support with a full range of scheduled maintenance checks. The component and avionics overhaul division provides warranty and repair services. It is also involved in trading of aviation products. The company is principally based at Hong Kong International Airport and its operations are carried out mainly in Hong Kong.