Unmanned Aircraft Systems (UAS) have seen unprecedented levels of growth during the last decade in both military and civilian domains. However, it is anticipated that civilian applications will be dominant in the future, although there are still barriers to be overcome and technical challenges to be met. For example, integrating UAS into civilian space, fully autonomous navigation, see-detect-and-avoid systems, smart UAS designs, system integration, vision-based navigation, logistics and training, to name but a few areas, will be of prime importance in the near future. This special volume...