United Air Lines, Inc., operating as United Airlines, is a U.S. airline and the world’s largest airline with 86,852 employees and operating the second-largest fleet with 702 aircraft. It is a subsidiary of United Continental Holdings, Inc. formerly, UAL Corporation, with corporate headquarters in Chicago. United’s largest hub is George Bush Intercontinental Airport in Houston. United is a founding member of the Star Alliance, the largest airline alliance in the world, and offers connections to over 1,000 destinations in over 170 countries worldwide. The airline’s regional service is United Express.

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