Final answer:
Hayward Executive Airport is surrounded by Class D airspace, requiring two-way radio communication with the control tower before entry.
Step-by-step explanation:
The airspace surrounding Hayward Executive Airport is designated as Class D airspace. This type of airspace is generally characterized by airspace from the surface up to 2,500 feet above the airport elevation (charted in MSL) surrounding those airports that have an operational control tower. The configuration of Class D airspace is individually tailored and when the associated control tower is not in operation, the airspace reverts to a Class E or G airspace. It has a radius of several miles and encompasses the air traffic pattern for the airport. These areas are depicted on aeronautical charts, which Hayward Executive would be included on, and pilots are required to establish two-way radio communication with the tower before entering.