What is the primary function of the Chicago Department of Aviation?

Answer: B — Operating airport facilities

The primary function of the Chicago Department of Aviation is to operate airport facilities. This encompasses the management of the physical infrastructure at airports, such as runways, terminals, parking areas, and other support facilities necessary for airport operations. By focusing on the operation of these facilities, the department ensures safe, efficient, and effective airport services to both travelers and airlines. This responsibility also includes overseeing maintenance, security, and services that facilitate the daily operations of the airport, providing a seamless experience for airport users.