The first concerted attempt at codification on an international scale took place before 1910, when German balloons repeatedly made flights above French territory.2 The French Government was of the opinion that for safety reasons it would be desirable for the two governments involved to try and reach an agreement to resolve the problem. As a result the Paris Conference of 1910 was convened, the tendency of the conference did not adopt the idea of ‘freedom of the air’ but was in favor of the sovereignty of states in the space above their