One very good reason to fly KLM business class, apart from the obvious comfort, is to collect one of these complimentary Delft blue-and-white porcelain reproductions of old Dutch canal houses. As of 2008, KLM offered 88 different houses, enough to keep you flying for many years — and a new house is added on October 7 (KLM’s anniversary) every year. The houses vary in size from 2 to 4 inches, and are filled with Bols Jenever, a Dutch liqueur made from juniper berries. Prior to these houses, KLM used to give its passengers the iconic Delft blue tiles. The impetus for these houses came from a rule that limited the value of gifts given by airlines to its customers to 75 US cents. The Delft blue tiles previously given by KLM broke the rule, but these ‘liqueur containers’ didn’t, since there were no restrictions on serving duty-free alcohol!