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United Airlines

United Airlines (UA/UAL) is a U.S. network airline headquartered in Chicago, with a hub-and-spoke operation built around airports including Chicago O’Hare, Denver, Houston Intercontinental, Newark, San Francisco and Washington Dulles, plus United Express regional feed for smaller-city connections. United is a Star Alliance member and runs the MileagePlus frequent-flyer program. For travelers, it is most relevant as a full network carrier for U.S. domestic connections, transatlantic and transpacific flying, and Star Alliance crediting or status recognition; always check the operating carrier, fare type and booking class before crediting, because partner earning can vary by eligible fare class.