Reliable estimates on the expansion possibilities in international travel based on the disposable income available to the American people. available leisure time. and on standards for expected international travel established as far back as 1929 show that there is a potential of 1.300.000 United States overseas travelers per year and that expenditures of this number of travelers would be at least $1.300.000.000 more than the 1953 expenditure. or at least $2.500.000.000 a year. It is estimated. for example. that the current travel volume of 332.000 to Europe and the Mediterranean in 1952 can be increased to 800.000. The impediments to travel are official restrictions on visas. customs. and similar regulations for the traveler and for the carrier such as port taxes. excessive documentary requirements. and landing rights. and other operating restrictions. inadequacy of hotel accommodations. inadequacy of development of recreation and sightseeing areas and the costs of transportation. The most remarkable advances have been made in bringing down the costs of transportation. particularly by aircoach fares and reduced offseason travel rates to Europe on ships and planes. This has made for the most extraordinary stimulus to international travel in the postwar era.