What is the hierarchy of Canadian airspace from highest to lowest?

The hierarchy of Canadian airspace from highest to lowest indeed starts with Controlled Airspace, which is designated airspace where air traffic control (ATC) services are provided. This type of airspace is critical for maintaining safety and order among aircraft, especially in crowded areas, and includes various classes like Class A, B, and C airspace.

Next in the hierarchy is Restricted Airspace, which may be established for security or safety reasons and where entry is limited or prohibited without specific permissions. This classification reflects the need to protect sensitive areas or activities that may pose a danger to aviation if violated.

Following Restricted Airspace are Airports, which serve as critical infrastructure for both passenger and cargo flights. Airports are the facilities where aircraft are able to take off and land, providing necessary services for the operation of air traffic.

Lastly, Heliports, while essential for rotorcraft operations and often located near urban environments for quick access, represent the lowest level in this hierarchy. They allow for the landing and departure of helicopter traffic but operate under different regulations and typically less controlled environments compared to airports.

This sequence underscores the organized structure that prioritizes safety and efficiency in aviation operations across Canadian airspace.