EXHIBIT 21 SUBSIDIARIES OF WERNER ENTERPRISES, INC. ---------------------------------------- JURISDICTION OF SUBSIDIARY ORGANIZATION ---------------------------------------- ------------ 1. Werner Leasing, Inc. Nebraska 2. Werner Aire, Inc. Nebraska 3. Gra-Gar, LLC Delaware 4. Drivers Management, LLC Delaware 5. Werner Management, Inc. Nebraska 6. Drivers Management Holding, Inc. Nebraska 7. Frontier Clinic, Inc. Nebraska 8. Fleet Truck Sales, Inc. Nebraska 9. Professional Truck Drivers School, Inc. Nebraska 10. Werner Transportation, Inc. Nebraska 11. Werner de Mexico, S. de R.L. de C.V. Mexico