Which of the following is a source of non-aeronautical revenue for airports?

Non-aeronautical revenue for airports refers to income generated from activities and services that do not directly relate to the operation of aircraft or air travel. Customer Facility Charges are fees collected from rental car companies to help cover the expenses associated with rental car facilities at airports. This charge is typically passed on to customers who rent vehicles, and it serves as a source of revenue for the airport, contributing to its financial sustainability without relying on air traffic or aviation operations.

In contrast, landing fees pertain directly to the use of airport facilities by aircraft; government grants are typically designated for specific project funding rather than ongoing revenue; and passenger ticket sales are directly tied to airline operations and thus represent aeronautical revenue. This distinction helps clarify why Customer Facility Charges stand out as a clear example of non-aeronautical revenue sources.