The disclosure relates to an arrangement comprising a flyable unmanned transporting device and a movable catch arm, which is provided at a ground station, for holding the transporting device at the ground station, wherein at least one recess is provided on the transporting device, and the catch arm, at its end facing away from the ground station, has at least one expansion element which can be introduced into the at least one recess and, in the introduced state, can be expanded in order to produce a form fit between the at least one recess and the at least one expansion element.