What type of airspace typically extends 3 nautical miles over international waters?

The correct answer is related to the fact that a warning area is a designated airspace that warns pilots of potential hazards to aircraft operations, such as military activities. These areas can extend over international waters and are typically established to provide information on activities that may be hazardous to nonparticipating aircraft.

In the context of international waters, warning areas can extend up to 3 nautical miles from the baseline of the territorial sea as defined by international law. This helps ensure that pilots are aware of any ongoing activities or potential dangers in these regions, allowing them to navigate safely and avoid unwanted encounters.

The other airspace types, while established for specific purposes, do not have the same applicability or definition in international waters. Controlled airspace refers to the airspace in which air traffic control services are provided, but it is usually associated with specific operational requirements rather than geographical definitions over international waters. Restricted areas are designated to contain activities that could be hazardous to aircraft, but they may not be exclusive to international waters. Prohibited areas are designated for operations that are not permitted, again not uniquely tied to international waters in the same context as a warning area.