Which type of airspace requires pilot communication with ATC?

Class D airspace is characterized by its requirement for pilots to communicate with Air Traffic Control (ATC) prior to entering. This type of airspace generally surrounds an airport with an operational control tower and has a defined vertical and lateral boundary. The communication with ATC is crucial for maintaining safety, as it allows for the coordination of aircraft movements in the vicinity of the airport and helps to prevent collisions.

In contrast, Class G airspace is uncontrolled, meaning that pilots do not need to communicate with ATC to operate within it. Class E airspace, while it often requires communication with ATC under certain conditions, does not universally demand it for all operations. This makes Class D unique in its specific requirement for pilot-ATC communication, ensuring both safety and orderly flight operations in areas with more complex air traffic situations.