The world's highest PostNL mailboxes are blue

KLM passengers can send a postcard to their loved ones all around the world during the month of October.

In this month, PostNL can for once use the blue mailboxes that usually fly at an altitude of ten kilometers. The fun, colorful postcard has been developed by the Dutch duo BLOND. KLM cabin crew will distribute the postcard to all passengers on intercontinental flights and in business class in Europe. The dispatch of the card will be done by PostNL, anywhere in the world. This event is part of the 'From Holland' festival, where KLM passengers can enjoy products and articles with a Dutch touch in October and November.