Which of the following is NOT included in controlled airspace?

Controlled airspace is defined as airspace in which air traffic control (ATC) service is provided to pilots. This includes areas where ATC has authority to manage the flow of air traffic in order to ensure safety and efficiency. The term "uncontrolled zones" refers to airspace where ATC does not provide the same level of oversight, allowing pilots to operate without needing to communicate with ATC.

The correct option is the one that identifies airspace not governed by ATC. Uncontrolled zones are specifically the regions where pilots operate independently and do not require clearance from ATC to enter or exit, which differentiates them from controlled airspace areas like Terminal Control Areas, Control Zones, and Transition Areas, all of which involve interaction with ATC for safe navigation and traffic management.

Understanding the nature of controlled versus uncontrolled airspace is crucial for pilots as it directly affects flight planning, compliance with regulations, and operational safety during flights.