NEW YORK (Standard&Poor's) Aug. 14, 2013--Standard&Poor's Ratings Services today assigned its 'A- (sf)' rating to United Airlines Inc.'s series 2013-1 Class A pass-through certificates with an expected maturity of Aug. 15, 2025, and its 'BB+ (sf)' rating to United's series 2013-1 Class B pass-through certificates with an expected maturity of Aug. 15, 2021. The final legal maturities will be 18 months after the expected maturity. United is issuing the certificates under a Rule 415 shelf registration. The 'A- (sf)' and 'BB+ (sf)' ratings are based on the credit quality of United's parent, United Continental Holdings Inc. (United Continental; B/Stable/--); the substantial collateral coverage by good-quality aircraft; and the legal and structural protections available to the pass-through