A familiar humming sound on a sunny day draws many people to the sky. WDL operates the world's only blimp, a non-rigid airship, in Mülheim an der Ruhr. "Theo" is a true landmark of the Ruhr region and will be up close and illuminated for visitors on the day of the ExtraSchicht (Extra Shift) event. The WDL Group has been based on Lilienthalstraße for 65 years, offering sightseeing flights over the region – by day and even by night!
