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Since 1952, business class passengers on KLM have been given miniature Delft houses filled with gin. Now KLM has a very nice microsite you can use to find out more about the 91 different miniatures. It also offers a mobile app you can use to find the houses in the real world. The KLM houses are apparently a big deal in the Netherlands; according to the Wall Street Journal, they are considered a real status symbol.