In the 1970s, the International Apfelpfeil Organization (IAO) organized the so-called "Apfelfahrten" ("Apple Trips"), nostalgic trips throughout Europe with special trains. In 1976, the IAO took over the well-known "Rheingold" vista dome cars and other cars from the TEE car pool of the German Federal Railroad. For several years the easily-identifiable trains were symbols of comfortable, exciting travel at reasonable prices. Later, faced with increasing competition from flat-rate travel with charter aircraft, this concept could no longer be sustained economically. In 1979 the IAO had to discontinue operations and declare bankruptcy. These special cars were sold to other tour operators and are still in use today. Some of them have been rebuilt.