Final answer:
The Fentress NALF Airport (NFE) is located within Class G airspace, which is uncontrolled airspace not requiring air traffic control services.
Step-by-step explanation:
The Fentress NALF Airport (NFE) is in Class G airspace. Class G is uncontrolled airspace that does not require the services of air traffic control (ATC) and has the least amount of requirements for aircraft operating within it. Airports within Class G airspace typically do not have an operating control tower or it is not operational at all times, and pilots are responsible for seeing and avoiding other aircraft and for determining their own takeoff and landing patterns in visual flight rules (VFR) conditions.