Where was the first convention for the reservation of sovereignty of airspace held?

The first convention for the reservation of sovereignty of airspace was held in Paris. This convention, known as the Paris Convention of 1919, established the legal framework surrounding air navigation and laid down the principle that states have complete and exclusive sovereignty over the airspace above their territory. This foundational idea is critical for the aviation industry, determining how nations control and regulate air traffic, as well as the responsibilities and rights of both states and international airspace.

The significance of the Paris Convention extends beyond the establishment of air sovereignty; it also contributed to the development of international air law and the creation of organizations that facilitate international cooperation in aviation. This is pivotal in ensuring safe and efficient air travel across different jurisdictions.

In contrast, the other options correspond to different historical events or conventions unrelated to the initial establishment of sovereignty over airspace. For example, the Warsaw Convention of 1929 focuses on international air transport and liability, while conventions held in Rome and Guadalajara pertain to other aspects of aviation law and regulations, not the issue of airspace sovereignty that was first addressed in Paris.