According to London’s Tanker Operator, the International Parcel Tankers Association (IPTA) has protested the Panama Canal "loyalty scheme" for containerships transiting the canal. In a submission to the Panama Canal Authority (ACPO public hearing, IPTA general manager Janet Strode said: "It is true chemical tankers are smaller, but there are those who have just as many, or more transits per year." Ms Strode said chemical tanker operators were listed in the top 50 in the ACP's customer rankings for January, which given the handicap of their smaller size where the rankings are concerned, shows a considerable commitment to the canal. Ms Strode stressed said that many IPTA members make between 25 and 75 canal transits per year and suggested that this represented a level of loyalty that is equal to the containership operators. The proposed tariff restructuring calls for each segment to be priced based upon different units of measurement, while aligning with customers' needs and requests and modifying pricing for all canal segments, ACP said. For example, containers will be measured and priced by TEU, drybulk carriers will be based on deadweight tonnage capacity and tonnes of cargo, passenger vessels will be based on berths, LNG will be based on cubic metres and tankers will be measured and priced on Panama Canal tons and metric tonnes.