We are going to see even more sophisticated UAVs in the future. Currently, unmanned aerial vehicles have a limited range. To extend that range, it is possible to use another UAV to refuel or recharge. The below video shows how a UAV can be used for autonomous aerial refueling to achieve extended range:
The system has two autonomous aerial vehicles: a leader and a follower. Docking is attempted when the follower drone detects the correct position. Once recharged, the follower disconnects and resumes its mission. What do you think? Are you impressed?