NEW YORK (Standard&Poor's) March 24, 2014--Standard&Poor's Ratings Services today assigned United Airlines Inc.'s series 2014-1 Class A pass-through certificates (with an expected maturity of April 11, 2026) a preliminary 'A- (sf)' rating, and assigned the company's series 2014-1 Class B pass-through certificates (with an expected maturity of April 11, 2022) a preliminary 'BB+ (sf)' rating. The final legal maturities will be 18 months after the expected maturity. United is issuing the certificates under a Rule 415 shelf registration. We will assign final ratings upon the completion of our legal and structural review. We base the preliminary 'A- (sf)' and 'BB+ (sf)' ratings on the credit quality of United's parent, United Continental Holdings Inc. (B/Stable/--); substantial collateral