The New York Stock Exchange LLC filed with the Securities and Exchange Commission for immediate effectiveness proposed amendments to Rule 15A.50, which reflect certain changes made to NYSE trading systems in order to comply with the Order Protection Rule of Regulation NMS (Rule 611). NYSE Rule 15A.50 currently describes NYSE’s order routing practices under the Intermarket Trading System (ITS) Plan, which is expected to terminate on the Trading Phase Date of Regulation NMS. As revised, Rule 15A.50 describes the circumstances under which NYSE will automatically route orders to prevent trade-throughs under Rule 611 and consistent with the anticipated elimination of the ITS Plan. NYSE has requested limited no-action relief to postpone its obligation under the revised rule to route orders to protected quotations of NASD Alternative Display Facility participants and to the International Stock Exchange until April 5.

http://www.sec.gov/rules/sro/nyse/2007/34-55387.pdf