EXHIBIT 32.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the annual report of Yellow Roadway Corporation on Form 10-K
for the year ended December 31, 2003, as filed with the Securities and Exchange
Commission of the date hereof (the "Report"), I, William D. Zollars, Chief
Executive Officer of Yellow Roadway Corporation, certify, pursuant to 18 U.S.C.
Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of
2002, 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 Yellow
      Roadway Corporation.

Date: March 15, 2004             /s/ William D. Zollars
                                 -----------------------
                                 William D. Zollars
                                 Chairman of the Board of
                                 Directors, President & Chief
                                 Executive Officer