From what altitude does a Control Zone (CTR) typically start?

A Control Zone (CTR) typically starts at surface level because it is designed to provide air traffic control services to all aircraft operating in that area, ensuring safe and orderly flow of traffic near airports. The airspace within a CTR is essential for managing aircraft operations during takeoff and landing phases, which occur at low altitudes, right from the ground level.

Starting the CTR at surface level allows air traffic controllers to monitor and manage all relevant air traffic, including arrivals, departures, and any other flights operating close to or within the airspace around an airport. This is particularly important in busy airspace to prevent collisions and maintain the safety of all aircraft involved.

In contrast, starting a CTR at higher altitudes, such as 1,000 feet or above, would limit its effectiveness in managing the critical phases of flight occurring at and near the airport. It is important for those studying air law to understand the foundational purpose and operational requirements of controlled airspace, especially in the context of its proximity to airports.