NEW YORK (Standard&Poor's) April 3, 2014--Standard&Poor's Ratings Services today assigned its 'A- (sf)' rating to United Airlines Inc.'s series 2014-1 class A pass-through certificates, which have an expected maturity of April 11, 2026. At the same time, we assigned our 'BB+ (sf)' rating to the company's series 2014-1 class B pass-through certificates, which have an expected maturity of April 11, 2022. The final legal maturities will be 18 months after the expected maturity. United Airlines is issuing the certificates under a Rule 415 shelf registration. Our ratings on the series 2014-1 pass-through certificates reflect the credit quality of United Airlines's parent, United Continental Holdings Inc.; the substantial collateral coverage by good-quality aircraft; and the legal and