Which of the following is not a function of the Clearance Delivery position in the tower?

The Clearance Delivery position in the control tower primarily focuses on issuing IFR clearances, providing flight plan information, and coordinating with ground control to ensure safe and efficient aircraft operations prior to takeoff.

Issuing IFR clearances is essential for guiding pilots on their routing and altitude, ensuring that aircraft can enter controlled airspace safely. Providing flight plan information helps inform pilots about their flight paths and any relevant adjustments or considerations. Coordinating with ground control is also crucial as it maintains communication between various positions in the tower, ensuring a smooth transition from the ground to the air.

Compiling statistical data, on the other hand, falls outside the regular duties of Clearance Delivery. This task is generally associated with positions that deal with operational oversight, analysis, or maintenance of records, rather than the immediate operational functions of issuing clearances and coordinating takeoffs. Hence, it is not considered a core responsibility of the Clearance Delivery position.