NEW YORK - The Ad Hoc Committee of passenger service agents in the Chapter 11 bankruptcy proceeding of AMR Corp., the parent company of American Airlines, on April 19 filed a brief in the U.S. Bankruptcy Court for the Southern District of New York, arguing that AMR should be restrained from making unilateral changes in the terms and conditions of employment (In Re: AMR Corporation, No. 11-15463, Chapter 11, S.D. N.Y. Bkcy.).