Final answer:
The Platte Valley Airport (18V) in Colorado is surrounded by Class G airspace, which is uncontrolled airspace usually found in rural areas with limited air traffic.
Step-by-step explanation:
The Platte Valley Airport (18V) is located in Colorado, USA. The airspace surrounding the airport at the surface is classified as Class G airspace.
In the United States, airspace is divided into different classes based on factors such as air traffic density and instrument flight rules. Class G airspace, also known as uncontrolled airspace, is typically found in rural areas with limited air traffic.
Class G airspace extends from the surface up to a specified altitude, usually 1,200 feet above ground level or higher, depending on the location. It does not have controlled or restricted access, so pilots operating within this airspace must rely on visual flight rules (VFR) and maintain appropriate separation from other aircraft.