This small aircraft is built through the blueprint menu for the old base, along with its docking station. There, the drone recharges, it always returns to the station after the death of your character. Flight controllers and hydraulic parts for this station can be found in the depths of the laboratory, in the corpse of one of the bosses.
Please note that the blueprint of the docking station (at the entrance of the Transport Hub) can only be found if you have completed all the available missions of the Survivor’s Path and have started performing tasks in search of a mysterious signal.