Final answer:
The SOS comprises two subsystems: CARTS and STARS, which work together to enhance the safety and efficiency of air traffic control.
Step-by-step explanation:
The Standard Terminal Automation Replacement System Operational Site (SOS) is an essential component in air traffic management, and it comprises two main subsystems.
These are the Common Automated Radar Terminal System (CARTS) and the Standard Terminal Automation Replacement System (STARS) subsystems. CARTS delivers air traffic control services for both en-route and terminal air space, while STARS is designed to replace CARTS by providing a more advanced air traffic control capability. Both subsystems work together to enhance the safety and efficiency of the National Airspace System (NAS) by providing air traffic controllers with the tools needed to manage air traffic flow effectively.