(b) The Charterers are to procure that all passenger tickets issued during the Charter Period for the carriage of passengers and their luggage under this Charter shall contain a paramount clause incorporating any legislation relating to carrier s liability for passengers and their luggage compulsorily applicable in the trade; if no such legislation exists, the passenger tickets shall incorporate the Athens Convention Relating to the Carriage of Passengers and their Luggage by Sea, 1974, and any