In connection with the Annual Report of U.S. Xpress Enterprises, Inc. (the “Company”) on Form 10-K for the year ending December 31, 2006 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned hereby certifies, pursuant to 18 U.S.C. § 1350 (as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002) that he is the Chief Executive Officer of the Company and that: (1) the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and (2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.