The trade union Verdi has called on Lufthansa’s ground staff to go on strike on Wednesday. Airports in Frankfurt, Munich, Hamburg, Berlin and Düsseldorf will be affected, a Verdi spokesperson said early on Monday. “As all ground staff from maintenance to passenger and aircraft handling are being called out on strike, there are likely to be major flight cancellations and delays,” Verdi wrote in a statement on Monday morning. The strike is in response to ongoing Lufthansa Group-wide wage negotiations for the approximately 25,000 ground crew employees at Deutsche Lufthansa, Lufthansa Technik and …