When a contact is described as "High," what is its altitude relative to MSL?

In the context of aviation terminology, when a contact is described as "High," it specifically refers to an altitude that exceeds 40,000 feet Mean Sea Level (MSL). This classification is significant in air traffic control and aviation operations, as it helps pilots and air traffic controllers understand and manage aircraft flying at different altitude levels.

The term "High" is commonly used to distinguish between various types of air traffic and to ensure safe vertical separation among aircraft. Altitudes above 40,000 feet MSL often indicate operations in the higher airspace of the atmosphere, which typically involves jet traffic and specific air traffic control protocols. This demarcation is essential for maintaining safety and efficiency within the airspace system.

Understanding these altitude categorizations is crucial for effective communication and navigation in the aviation field. The incorrect options do not encapsulate the definition of "High" in aviation terms, as they indicate ranges or specific criteria that do not correspond to the established threshold of over 40,000 feet.