HAA

Height Above Airport

Height Above Airport (HAA) refers to the altitude of an aircraft or object above the elevation of a specific airport's reference point, typically the airport's runway threshold or a designated reference datum.

High-Altitude Airship

A High-Altitude Airship (HAA) is a type of unmanned aerial vehicle (UAV) that operates at extremely high altitudes, typically above 60,000 feet (18,288 meters). HAAs are designed to stay aloft for extended periods, often weeks or even months, and are used for a variety of applications, including communications, surveillance, and earth observation.