Which type of airspace requires two-way radio communication with ATC?

In the context of airspace requirements, Class C airspace is defined as requiring two-way radio communication with Air Traffic Control (ATC) for any aircraft entering or operating within that space. This type of airspace is designed to manage traffic around airports that have a significant volume of air traffic, usually associated with a control tower.

Before entering Class C airspace, pilots must establish communication with ATC and receive an acknowledgment, ensuring that ATC is aware of their presence and intentions. This requirement is essential for maintaining safety and efficient traffic flow within the congested airspace near major airports.

In contrast, Class G airspace does not require communication with ATC, while Class E airspace has varying communication requirements depending on the specific operations being conducted. Class D airspace necessitates communication with the control tower, but the classification implies lower traffic density than Class C. This nuanced understanding of operational protocols is crucial for pilots navigating different air spaces.