United Continental Holdings, Inc. announced that it is notifying holders of the $155,640,000 outstanding principal amount of its 4.50% Senior Limited-Subordination Convertible Notes due 2021 that it has elected to effect an optional redemption of all of the outstanding Notes on February 10, 2014. Per the terms and conditions of the indenture and the notes, holders will retain the right to convert their notes (or portions thereof) into the company's common stock until February 6, 2014, which is the second business day prior to the redemption date.