The years between the two World Wars were marked by a continuous growth of civil aviation in both the technical and the commercial fields, even though flying was not yet opened to the masses but remained a rather exclusive means of personal transport. In fact, it was around 1930 when, after an ICAN Meeting, three prominent General Directors of Civil Aviation, met at the Paris Gare du Nord, and that the famous phrase was coined: "The layman flies, the expert takes the train", a phrase which perfectly reflected the uncertainties which surrounded flying at that time, especially during the bad weather periods in Europe. However, the search for higher speed, greater reliability and the covering of greater distances continued throughout this period in all industrialized States and each step forward in these fields brought the great potential inherent to air transport closer to reality.
It is needless to say that the aviation made during World War II not only resulted in horror and human tragedies but that its utilization also significantly advanced the technical and operational possibilities of air transport in a world which had finally found peace again. In fact, for the first time large numbers of people and goods had been transported over long distances and ground facilities had been developed to permit this in an orderly and expeditious manner. It was for this reason that, in 1943, the US initiated studies of post-war civil aviation problems which, once more, confirmed the belief that they either were to be tackled on an international scale or it would not be possible to use it as one of the principal elements in the economic development of the world and the first available means to start "healing the wounds of war" as President Roosevelt put it.