Which frequency is used by Clearance Delivery?

Clearance Delivery is a specific function performed by air traffic control that is responsible for providing pilots with their flight plan clearances prior to departure. The communication established on this frequency allows pilots to receive essential information regarding their flight routes, squawk codes for transponders, and any relevant Notices to Airmen (NOTAMs) before they taxi and depart.

This process is critical as it ensures that pilots have the necessary permissions and instructions before proceeding with their flights. While other frequencies such as Ground and Tower are crucial for different phases of flight, Clearance Delivery is uniquely focused on the initial communication of the flight plan clearance. Understanding this distinction helps to clarify why this frequency is integral to the departure process and flight safety.