United Airlines (UAL) is an airline holding based in Chicago, USA. It is a parent company for United Airlines and United Express that are engaged in carrying air passengers, property and mail across the USA and internationally. Incorporated on 30 December 1968, United Continental operates 339 destinations in 54 countries with approximately 143 million people transported annually. The company offers over 4,500 daily flights and has hubs in Chicago, Los Angeles, New York, San Francisco, Washington, D.C., Denver and Houston. United Continental has been listed on the New York Stock Exchange (NYSE) since 1 October 2010.