In which city was the first convention for the reservation of sovereignty of airspace held?

The first convention for the reservation of sovereignty of airspace took place in Paris. This significant event was known as the Paris Convention of 1919. The convention established crucial principles concerning international air law, primarily affirming that each state has complete and exclusive sovereignty over the airspace above its territory. This principle laid the groundwork for future air traffic management and international aviation agreements. The location in Paris was symbolic, representing a pivotal moment in international relations and cooperation in civil aviation.

In contrast, while other cities may have hosted various international meetings and conventions related to aviation or international law, none were the site of this inaugural convention that standardized the concept of air sovereignty.