Pilots at Lufthansa (LHAG.DE) staged a fourth straight day of walkouts on Saturday, grounding almost half of the German airline’s lucrative long-haul flights in a protracted row over early retirement benefits and cost cuts. Lufthansa canceled 74 of a total 160 long-haul connections scheduled for Saturday, affecting about 20,000 passengers, and said it was scrapping almost 60 percent of cargo flights. The airline’s dispute with pilots involves early retirement benefits that the VC pilots’ union wants to keep but which Lufthansa wants to change for new hires.