| Exhibit 32.1 |
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| **SECTION 1350 CERTIFICATION OF EXPRESSJET HOLDINGS, INC.**                                                                                                                                                                                                              |
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| I, James B. Ream, President and Chief Executive Officer of ExpressJet Holdings, Inc., certify, pursuant to Section 906 of theSarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code) that based on myknowledge: |
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| (1)                                                                                                                                                                                                                                                            | the annual report on Form 10-K for the year ended December 31, 2006 (the “Periodic Report”) which this statementaccompanies fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and |
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| (2)                                                                                                                                                                                                                                                            | information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results ofoperations of ExpressJet Holdings, Inc. |
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| This certificate is being furnished solely for purposes of Section 906 and is not being filed as part of the PeriodicReport.                                                                                                                                             |
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|  Date:  February 22, 2007           |                  | **/s/ James B.Ream                           ** |
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|                                                                   | James B. Ream President and Chief Executive Officer |

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