The European civil aviation conference

Note: Extra LargeThe doctrine of national sovereignty over airspace, although not new at the time, was established in the first convention on air law in 1919.[...] Consequentlly, State exchange commercail traffic to enable their airlines to operate internaitonally.. The granting of routes forms an integral part of the exchange of traffic light and the whole has tended to become an importnat political factor in air commerce.[...