The UAV(Unmanned Aerial Vehicle) have managed to come a long way in a very short time, all because of advanced printed circuit boards. The UAV as with Space/Satellites and Avionics, small devices require low weight and offer minimal space to design on.
PCB solution is often a Rigid-Flex to be able to avoid space demanding contacts and keep the weight down. Also Some UAV PCBs even need to be able to perform in outer space and must be extremely durable. Boards made with lightweight materials such as aluminum are also beneficial for use in aerospace.