What is the difference between Class C and Class D airspace?

The distinction between Class C and Class D airspace primarily relates to the requirements for communication with Air Traffic Control (ATC) and the operational structure of these airspace classes. Class C airspace is characterized by the need for two-way radio communication with ATC at all times when operating within this airspace. This requirement ensures that pilots operating in Class C airspace are in constant communication with ATC, which helps manage traffic and maintain safety in areas with higher density of aircraft operations.

On the other hand, Class D airspace requires prior communication with ATC before entering, but it does not mandate continuous two-way communication while within the airspace. This makes the interaction slightly less stringent compared to Class C, reflecting the typically lower traffic volumes and operational complexities found in Class D airspace areas, which generally surround smaller airports.

The other choices inaccurately characterize the airspace. Class C areas do have control towers, which aid in managing air traffic, similar to Class D areas. Both classes are not restricted solely to commercial or private use, and there are no requirements for flight plans in either airspace category. Understanding these distinctions is crucial for pilots, particularly when it comes to adhering to communication protocols while navigating different airspace types.