Exhibit 32.1

                                AEROCENTURY CORP.

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


     In connection with this annual report of AeroCentury  Corp. (the "Company")
     on Form 10-KSB/A for the period ended December 31, 2004 (the "Report"),  I,
     Neal D. Crispin,  Chief  Executive  Officer,  hereby certify as of the date
     hereof,  solely for purposes of Title 18,  Chapter 63,  Section 1350 of the
     United States Code, that to the best of my knowledge:

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

          (2)  the information  contained in the Report fairly presents,  in all
               material  respects,  the  consolidated  financial  condition  and
               results  of  operations  of the  Company at the dates and for the
               periods indicated.

This Certification has not been, and shall not be deemed, "filed" with the
Securities and Exchange Commission.



Date:  August 19, 2005                 /s/ Neal D. Crispin
                                       President & Chairman