NEW YORK (Standard&Poor's) March 11, 2013--Standard&Poor's Ratings Services said today that it has assigned its 'BBB-' (sf) rating to American Airlines Inc.'s 4% series 2013-1 Class A pass-through certificates with an expected maturity of July 15, 2025, and its 'B+' (sf) rating to American's 5.625% series 2013-1 Class B pass-through certificates with an expected maturity of Jan. 15, 2021. The final legal maturities will be 18 months after the expected maturity. The ratings are based on: The consolidated credit quality of American's parent, AMR Corp. (both rated 'D'); Our expectations regarding AMR's and American's likelihood of emerging from bankruptcy; Substantial collateral coverage by good-quality aircraft; and The legal and structural protections available to the pass-through certificates.