How many countries are known to have established ADIZs?

The correct choice is based on the fact that as of the latest data, approximately 20 countries worldwide have established Air Defense Identification Zones (ADIZs). An ADIZ is a designated area of airspace established by a country to monitor and control the entry of aircraft into a particular region. This is often done for national security reasons and is a critical part of maintaining air defense.

Countries that have created ADIZs include major powers such as the United States, Russia, China, and Japan, among others. Each of these nations sets up an ADIZ to better manage their airspace, particularly in response to potential aerial threats. The number can vary due to geopolitical changes, but generally, the figure is around 20 established ADIZs globally, recognizing the complexity and operational considerations that come into developing these airspace zones effectively.

Understanding the role and the jurisdictions of these zones is important for any pilot, including helicopter pilots, as it affects flight planning and compliance with international air traffic regulations.