(2)(a)In the carriage of registered baggage and of cargo, the liability of the carrier is limited to a sum of two hundred and fifty francs per kilogramme, unless the passenger or consignor has made, at the time when the package was handed over to the carrier, a special declaration of interest in delivery at destination and has paid a supplementary sum if the case so requires. In that case the carrier will be liable to pay a sum not exceeding the declared sum, unless he proves that that sum is greater than the passenger’s or consignor’s actual interest in delivery at destination.
(b)In the case of loss, damage or delay of part of registered baggage or cargo, or of any object contained therein, the weight to be taken into consideration in determining the amount to which the carrier’s liability is limited shall be only the total weight of the package or packages concerned. Nevertheless, when the loss, damage or delay of a part of the registered baggage or cargo, or of an object contained therein, affects the value of other packages covered by the same baggage check or the same air waybill, the total weight of such package or packages shall also be taken into consideration in determining the limit of liability.