United Airlines

United Airlines is one of the major American and global airlines. It is headquartered at the Willis Tower in Chicago, Illinois. Being the third-largest airline in the world, it operates a large domestic and international route network. Hundreds of destinations across the world are served and these include 358 airports3. United Airlines has seven hub bases, while Chicago, O-Hare airport is the biggest. Founded in 1926 , it employs over 86,000 people.