This freedom is also known as stand-alone cabotage:

Stand-alone cabotage refers to the concept of allowing foreign carriers to operate domestic flights within a country, typically for the purpose of transporting passengers or goods between two points within that country. This is particularly significant in the context of international aviation and trade regulations. The term "freedom" in this context is derived from the "freedoms of the air," which are a set of international aviation rights granting specific privileges to airlines.

The ninth freedom specifically encompasses the right for an airline to transport passengers or goods between domestic points within a country other than its own, without needing to have rights to any international legs before or after these domestic flights. Hence, it allows airlines to operate stand-alone cabotage services without requiring prior connections to international routes.

Understanding this concept is crucial for those involved in aviation management and international trade, as it directly pertains to market access, competition, and regulatory frameworks within the aviation sector.