Exhibit 99.1

Certification of the Principal Executive Officer
Pursuant to 18 U.S.C. 1350
(Section 906 of the Sarbanes-Oxley Act of 2002)

I, John W. Creighton, the Chairman and Chief Executive Officer of UAL Corporation (the "Company") certify that to the best of my knowledge, based upon a review of the Quarterly Report on Form 10-Q for the period ended June 30, 2002 of the Company (the "Report"):

(1)  The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)  The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

 

/s/ John W. Creighton
John W. Creighton
UAL Corporation
Chairman and Chief Executive Officer
August 14, 2002