EXHIBIT 99

                            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 the Comair Savings and Investment Plan
(the "Plan") on Form 11-K for the year ended December 31, 2002, as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), Linda
E. Noble, Chairman of the Administrative Committee of the Plan, who performs the
functions equivalent to a chief executive officer and chief financial officer of
the Plan, hereby certifies, that, on the date hereof:

(1)      such Report fully complies with the requirements of Section 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 Plan.



Date: June 27, 2003                      /s/ Linda E. Noble
                                         --------------------------------------
                                         Linda E. Noble
                                         Chairman, Administrative Committee
                                              Comair Savings and Investment Plan

A signed original of this written statement required by Section 906 has been
provided to the Savings Plan and will be retained by the Savings Plan and
furnished to the Securities and Exchange Commission or its staff upon request.