private void removeAllTraffic(){
  List<AirMapTraffic> removed=new ArrayList<>(allTraffic);
  allTraffic.clear();
  notifyRemoved(removed);
}

private void removeAllTraffic ( ) { List < AirMapTraffic > removed = new ArrayList < > ( allTraffic ) ; allTraffic . clear ( ) ; notifyRemoved ( removed ) ; }
removes all traffic from the list and notifies the listener
