.S. Xpress, the company's largest subsidiary, is a premium truckload carrier that specializes in serving customers that require time-definite and expedited services. These capabilities help customers operate just-in-time manufacturing or distribution systems efficiently and keep inventories low, thereby increasing customers' asset utilization. The company operates over 4,400 company-owned tractors and 9,000 dry van trailers. Over one-half of the company's tractors are operated by driver teams, enabling expedited service over long distances.