Passengers were set to face more disruptions on Friday due to strikes by aviation security staff at six German airports. Thousands of passengers were set to be affected after trade union verdi called for further strikes by aviation security staff at the Hanover, Dortmund, Weeze, Dresden, Leipzig and Karlsruhe/Baden-Baden airports. The first employees went on strike in Hanover late on Thursday. Verdi is trying to increase pressure on the employers ahead of the next round of negotiations on 20 March. Strikes by security staff at five other German airports brought operations to a virtual standsti…