Discover Airlines, a Lufthansa subsidiary, faces more flight disruptions over the weekend following the extension of a strike by pilots and cabin crew. Originally scheduled to end on Friday, the strike will now continue until Sunday, the German pilots’ union VC announced on Thursday. The strikes, organized by the VC pilots’ union and the flight attendants’ union UFO, came after Lufthansa management reached a labour deal with the rival union verdi. Verdi represents only a small number of pilots and flight attendants at the Lufthansa Group, according to the VC and UFO trade unions, which are usi…