EXHIBIT 21 USFREIGHTWAYS CORPORATION SIGNIFICANT SUBSIDIARIES OF THE COMPANY State of Parent and Significant Subsidiaries Incorporation USFreightways Corporation Delaware USF Bestway Inc. Arizona USF Dugan Inc. Kansas USF Holland Inc. Michigan USF Red Star Inc. New York USF Reddaway Inc. Oregon Logix Inc. Illinois USF Distribution Services Inc. Illinois Comet Transport Inc. Wisconsin USF Coast Consolidators Inc. California USF Caribbean Services Inc. Delaware USF Sales Corporation Delaware