DEMAND for services operated by leisure airline and package holiday firm Jet2.com have shown an 'encouraging' uplift after a slow start to the summer shareholders in parent company the Dart Group have been told. Group chairman and chief executive Philip Meeson told the annual general meeting: "In the preliminary results statement of 26 June 2014, I stated that in the early summer months we had found demand for leisure travel to the markets we serve less buoyant than we would have hoped and market pricing weak.