Which statement best describes the difference between a Control Zone (CTR) and a Control Area (CTA)?

• A. CTR extends from the surface upward; CTA extends from a limit above the earth
• B. CTR is above the atmosphere; CTA is near the surface
• C. CTR is for military operations; CTA is for civil flights
• D. CTR and CTA are the same thing

Answer: (A)

The main idea is how these airspaces start vertically. A Control Zone is the airspace around an airport that begins at the surface and extends upward to a defined top. This setup protects aircraft during the critical phases of flight near the ground, like takeoff and landing. A Control Area, on the other hand, starts at a higher lower limit above the surface and continues upward to its upper limit, making room for en-route traffic at higher altitudes. So the statement that a CTR extends from the surface upward and a CTA starts from a limit above the earth rightly captures the fundamental difference: CTRs are surface-based, while CTAs begin higher up.