NEW YORK (Standard&Poor's) Dec. 13, 2013--Standard&Poor's Ratings Services today said it has assigned its preliminary 'B+ (sf)' rating to American Airlines Inc.'s series 2013-2 Class C pass-through certificates with an expected maturity of Jan. 15, 2017. The preliminary rating is based on: The consolidated credit quality of American and its parent, American Airlines Group Inc. (both rated 'B'); The substantial collateral coverage by good-quality aircraft; and The legal and structural protections available to the pass-through certificates. The company will use the offering proceeds to acquire additional equipment notes, together with the previously issued Class A equipment notes issued July 31, 2012, and Class B equipment notes issued Nov. 21, 2013, to refinance the series 2009-1A pass-through