Which airspace class requires a two-way communication with ATC before entry for VFR flights?

For VFR (Visual Flight Rules) flights, Class C airspace is the class that mandates a two-way communication with Air Traffic Control (ATC) before entry. Class C airspace typically surrounds airports with a significant level of air traffic, where ATC services are provided, and involves both a surface area and a vertical column extending upwards.

Pilots flying in or through Class C airspace must establish and maintain communication with ATC prior to entering, ensuring that they can receive essential traffic advisories and instructions, which helps enhance safety in this busier airspace environment. This requirement makes it crucial for pilots to understand how to contact and communicate effectively with ATC to ensure a safe flight operation.

Classes A and D airspace also have specific communication requirements, but Class A is reserved for IFR (Instrument Flight Rules) flights only, while Class D requires communication when within the airspace but does not demand two-way communication prior to entry. Class F does not exist in the context of requiring two-way communication for VFR flights, as it primarily represents advisory airspace rather than controlled airspace.