WASHINGTON 3/14/01- The U.S. Postal Service has filed a case with the Postal Rate Commission seeking a three-year experimental classification for Priority Mail presort discounts. The filing includes discounts for three presortation options: ADC (area distribution center — a mail processing facility that represents a state or a large portion of a state), 3-digit prefixes, and 5-digit ZIP Code sorts. "We are seeking to make Priority Mail more affordable and offer our customers more options and greater value," noted John F. Kelly, President, Expedited/Package Services. In order to receive the discounts, mailers must meet certain containerization, preparation, and minimum quantity requirements. The containerization and preparation requirements may vary by mailer location. During the experiment, the Postal Service will determine if incentives provided by the discount structure are attractive and beneficial to the mailing community.