More than 100,000 Lufthansa passengers face delays and disrupted flights this week after German services union Verdi called its ground staff out on a 27-hour strike starting on Tuesday. Lufthansa said on Sunday that it was working on an emergency schedule. Airports in Frankfurt, Munich, Hamburg, Berlin, Dusseldorf, Cologne-Bonn and Stuttgart will be hit. Ground staff are to walk off the job at 4 am (0300 GMT) on Tuesday and return to work at around dawn on Wednesday, Verdi announced in Berlin. All ground staff, including maintenance and check-in personnel have been called out, with the result …