knight-swift transportation holdings inc., together with its subsidiaries, provides truckload transportation services in the united states and mexico. the company operates through three segments: trucking, logistics, and intermodal. its trucking services include irregular route, dedicated, refrigerated, flatbed, expedited, dry van, drayage, and cross-border transportation of various products, goods, and materials. the company also provides logistics and intermodal services, such as brokerage, intermodal, and certain logistics; freight management; and non-trucking services. in addition, it offers various support services, including repair and maintenance shop services, warranty, insurance, and equipment leasing; and trailer parts manufacturing services, as well as engages in the driving academy activities. the company operates a total of 18,877 tractors, which comprises 16,432 company-owned tractors and 2,445 independent contractor tractors, as well as 58,315 trailers; and 643 tractors