| 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 quarterly report on Form 10-Q for the quarterly period ended March 31, 2007 (the “Periodic Report”) which thisstatement accompanies 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:  May 9,2007                                |                  | **/s/ James B.Ream                          ** |
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|                                                                                                                                                                                    | James B. Ream President and Chief Executive Officer |

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