German trade union Verdi has called for a three-day nationwide strike of Lufthansa ground staff starting from Wednesday as a wage fight with the German flag carrier goes on. Passenger flights will not be affected, the union said. The work stoppage in the collective bargaining dispute affects employees and trainees at Lufthansa Technik, Lufthansa Aviation Training and Lufthansa Technical Training, Verdi said on Tuesday evening. Employees of Lufthansa Technik Logistik and Lufthansa Technik Logistik Services would join the work stoppage at different times depending on the location, minimizing dis…