Final answer:
Hayward Executive Airport is in Class D airspace, which is controlled and requires communication with the tower for all air traffic.
Step-by-step explanation:
The Hayward Executive Airport is located in Class D airspace. Airspaces are categorized from Class A to Class G, with each class having its own rules, regulations, and operational requirements. Class D airspace is generally airspace from the surface to 2,500 feet above the airport elevation (charted in MSL) surrounding those airports that have an operational control tower. It is designed to accommodate all types of air traffic, including student pilots, private pilots, and commercial airline operations that can communicate with the tower when entering, exiting, or flying within the airspace.