Below is a list of Delft Blue houses that KLM has presented to all of its World Business Class passengers since the 1950s.[1] Until 1994 the houses were issued irregularly. Since 1994, a new house has been presented each year on October 7, the anniversary of KLM's founding in 1919.[2]
^Zegeling, Mark (2015). Little Kingdom by the Sea: a Celebration of Dutch Cultural Heritage - Secrets of the KLM Houses Revealed. Markmedia & Art. ISBN 9081905627.
^ a b c"KLM Delft Blue houses". KLM. KLM.
^Zegeling, Mark (2016). Sterke Verhalen, Alle Geheimen achter de Gevels van de KLM-huisjes. Markmedia & Art. ISBN 978-90-819056-57. (in Dutch)
^"house#31". Gemeente Delft (in Dutch).
^"house#75". Beeldbank Haagse Gemeente (in Dutch).