Definition
An air traffic control position, and the associated radio frequency, responsible for issuing IFR clearances (and certain VFR clearances) to departing aircraft before taxi. On instrument approach charts and airport diagrams, CLNC DEL appears in the communications strip alongside the frequency a pilot uses to request and receive their clearance.
Plain English
The controller you call before you start moving to get permission for your flight, including your route, altitude, and any special instructions. CLNC DEL is just the short form of that controller's name and the frequency you use to talk to them.
Context Anchor
Seen in the communications information on instrument approach charts and airport information, usually as a radio frequency used before taxi or takeoff.
Derivation
Clearance comes from clear, meaning permission has been granted to proceed with no obstacles in the way. Delivery simply means handing it over. So clearance delivery is the position that hands the pilot their permission to fly the planned route.
Why Pilots Care
Obtaining clearance from this position prevents route deviations, airspace violations, and departure delays by ensuring the pilot has the exact ATC-approved plan before taxi.
Intuition Check
Clearance delivery is not a package-delivery service or a physical place on the airport. In this context, it means the radio source for receiving air traffic control clearance and departure instructions.
Example Sentence 1
Before starting the engines, the pilot tuned 121.85 and called Clearance Delivery to receive the IFR clearance to Denver.
Example Sentence 2
At Class B airports, pilots contact CLNC DEL before ground control to avoid blocking the taxi frequency with long clearance readbacks.