NEW YORK (Standard&Poor's) April 21, 2005--Standard&Poor's Ratings Services today lowered its ratings on selected equipment trust certificates (ETCs) and enhanced equipment trust certificates (EETCs) of AMR Corp. (B-/Stable/B-3) unit American Airlines Inc. (B-/Stable/--) as part of an industry-wide review of aircraft-backed debt. The ratings were removed from CreditWatch with negative implications, where they were placed on Feb. 24, 2005. "The rating actions reflect Standard&Poor's concern that repayment prospects for holders of aircraft-backed debt could suffer in a potential scenario of multiple, further bankruptcies of large U.S. airlines weakened by high fuel prices and intense price competition," said Standard&Poor's credit analyst Philip Baggaley. "Downgrades of ETCs and EETCs were focused on debt instruments