(Adds lawyer representing families of victims) By Emmanuel Jarry PARIS, Sept 5 (Reuters) - French judges have dropped charges against Air France and Airbus over a mid-Atlantic plane crash in 2009 that killed all 228 people on board, blaming the pilots for losing control of the plane. In their conclusions, seen by Reuters, the judges said the pilots of the Airbus A330 had failed to process all the warnings and instrument readings provided by the aircraft.