Boeing B737-800 Planes flown by United Airlines

United Airlines, Inc. is a major airline in the United States headquartered in Chicago, Illinois that operates an extensive domestic and international route network across the United States and six continents with more destinations than any other airline. Regional service operated by independent carriers under the brand name United Express feeds its eight hubs and the Star Alliance, of which United was one of the five founding airlines, extends its network throughout the world.
SOURCE: Wikipedia