Pilots handling cargo flights for Lufthansa Cityline, a Lufthansa Group subsidiary, will join an ongoing pilot strike at Discover, another subsidiary of the German airline, and walk off the job on Thursday at 6 pm (1600 GMT). The German pilots’ union VC said the strike at Cityline is a solidarity action with the Discover pilots. Eight cargo flights will be affected by the strike, although it’s unclear whether Lufthansa will cancel those flights or use other pilots to continue operations. The strike at Discover entered its third day on Thursday, but has so far caused only a limited number of ca…