Originally Posted by
chiefkays
Backup plan is to pay the Skytrain fare and activate the pass at the Düsseldorf Flughafen.
My $0.02: take the S11 to Düsseldorf Hbf and get your pass activated there.
(EDIT: having said that, there is a DB Reisezentrum presence at the airport - see
http://www.vrr.de/de/service/kundenc...041/index.html - so it might be worth asking there)