Operations were brought largely to a halt at five German airports on Wednesday as airport ground staff walked off the job as part of an ongoing wage dispute with the country’s largest airline Lufthansa, The carrier had to cancel up to 90% of its approximately 1,000 scheduled flights on Wednesday due to the industrial action. The airline said 100,000 passengers were affected. At major hubs Frankfurt and Munich, less than half of the usual flights took place as Lufthansa is the main operator there. Trade union Verdi had called on ground staff in Frankfurt, Munich, Hamburg, Berlin and Düsseldorf …