An aircraft for carrying at least one rigid cargo container includes a beam structure with a forward fuselage attached to the forward end of the beam structure and an empennage attached to the rearward end of the beam structure. The flexible walls of the cells bulge outwardly when initially filled with electrolyte and uncompressed. According to the invention the contours of the toothing systems are formed in such a way that only in the first axial direction can the friction plate be brought into engagement with the plate carrier via the predefined fitting end of the plate carrier. Embodiments include a CDR frequency offset adaptation loop that generates an adaptation signal, which can be monitored to detect an adaptation error arising from excessive frequency offset.