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Since 1952, KLM has presented its long-haul first-class passengers with small Delftware, blue-and-white porcelain reproductions of old Dutch canal houses, filled with jenever. In 1993, amidst the change-over from three to two cabins on its long-haul service, these canal houses (in Dutch, "huisjes") were made available to its "WorldBusiness Class" passengers.

Initially, these houses, ranging in size from 5 to 11 cm. (about 2 to 4 inches) were filled with Rynbende jenever (a Dutch liquor and precursor to gin made from juniper berries); once Rynbende (Simon Rynbende & Sons) was acquired by Henkes, the houses were filled with Henkes jenever, and, when that company was acquired by Bols, they became filled with Bols jenever.

The impetus for these houses was a rule aimed at curtailing a previously widespread practice of offering significant incentives to passengers by limiting the value of gifts given by airlines to 75 US cents; however, no limit was placed on the provisions of duty-free liquor, so KLM was able to provide this more-valuable gift, camouflaged as liquor. Prior to giving out these Delft-blue liquor-filled houses, KLM gave Delft-blue tiles as gifts, but these tiles broke the 75-cent limits.

There are 93 different houses as of late 2012, with an additional house added every year on 7 October; this being the anniversary of KLM's founding, each numbered and representing the number of years KLM has been in operation. Each year, a new house receives the next sequential number. All houses are reproductions of historic houses in the Netherlands or its overseas dependencies, although the specific location of every archetype of some of the first ten huisjes was not recorded.

In addition to the 93 standard houses, sealed and filled with jenever (with numerous variations on the wording on the bottom or back of the houses in different manufacturing batches and with different jenever manufacturer names), there are variants that are not filled with gin, which are distributed to passengers on certain long-haul flights to Islamic countries who forbid import or export of liquor. In 2006 when, in response to terrorist activities, liquids were banned or restricted on various flights, KLM's trans-Atlantic flights to the United States briefly also offered the same liquor-free huisjes. Until the early 1980s, the houses distributed on those routes were packaged as "ashtrays" with an open chimney and a semi-circular hole cut into the rear of the house, ostensibly for a cigarette.

Additional, larger, special Delftware have periodically been offered to VIPs and honeymoon couples; for most of the 1980s and 1990s, this was a model of the Royal Palace; since 2003, this was the "Waag". These are particularly prized by collectors.