What is the primary purpose of calling the Chicago Department of Aviation's operations number?

Answer: B — To report a fuel spill

The primary purpose of calling the Chicago Department of Aviation's operations number is to report a fuel spill. This is crucial for ensuring safety and environmental protection at the airport. Fuel spills can pose significant hazards, including fire risks and potential environmental contamination. Reporting such incidents immediately allows the appropriate response teams to take action swiftly, mitigating any danger to both people and the surrounding environment. In contrast, while inquiring about airport facilities, booking parking, or applying for a job are important functions, they do not fall under the immediate operational concerns managed through the operations number. Each of those functions typically has dedicated channels or departments that handle such queries and requests, emphasizing the focus of the operations number on urgent safety-related matters like fuel spills.