United Express is the brand name for the regional branch of United Airlines, under which five individually owned regional airlines operate short- and medium-haul feeder flights.

UAL Corporation is the former name of United Airlines Holdings, an airline holding company, incorporated in Delaware with headquarters in Chicago, Illinois. UAL held a 100 percent controlling interest in United Airlines, Inc., one of the world's largest air carriers, and is a founding member of the Star Alliance. It was announced on May 3, 2010, that UAL Corporation and Continental Airlines, Inc. would pursue a merger pending government approval. UAL Corporation would acquire Continental Airlines, Inc. and change its name to United Continental Holdings (UCH). On October 1, 2010, UCH, formerly UAL Corporation, announced completion of the merger. On Thursday June 27, 2019 United changed the name of its parent company from United Continental Holdings to United Airlines Holdings.