Document:

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                                                                    EXHIBIT 10.8

                      AMENDMENT NO. 3 TO RIGHTS AGREEMENT

     THIS AMENDMENT NO. 3 TO RIGHTS AGREEMENT (the "Amendment") is made and
entered into as of this 24th day of May, 2001, between AVIATION SALES COMPANY, a
Delaware corporation (the "Company"), and CONTINENTAL STOCK TRANSFER & TRUST
COMPANY, as Rights Agent (the "Rights Agent").

     WHEREAS, the Company and the Rights Agent are parties to a Rights Agreement
dated as of November 1, 1999, Amendment No. 1 to Rights Agreement dated as of
March 14, 2000 and Amendment No. 2 to Rights Agreement dated as of December 4,
2000 (collectively, the "Rights Agreement"); and

     WHEREAS, pursuant to Section 27 of the Rights Agreement, the Company may in
its sole and absolute discretion, and the Rights Agent shall if the Company so
directs, supplement or amend any provision of the Rights Agreement in any
respect without the approval of the holders of the Rights (as defined in the
Rights Agreement);

     NOW, THEREFORE, the Rights Agreement is hereby amended as follows:

     1. Amendment of Section 1(aa). Section 1(aa) of the Rights Agreement is
hereby amended and restated in its entirety to read as follows:

     "'Significant Holder' shall refer to each of (i) Robert Alpert and any
     Affiliate or Associate thereof (collectively, "Alpert"), for so long as
     Alpert is the Beneficial Owner of no more than 25% of the issued and
     outstanding Common Stock, and (ii) LJH, Corporation, a Texas corporation
     ("LJH"), for so long as Lacy J. Harber shall beneficially own 100% of the
     capital stock of LJH, Lacy J. Harber and any Affiliate or Associate thereof
     (including, without limitation and solely for purposes of this Agreement,
     Roy T. Rimmer and any Affiliate or Associate thereof) (collectively,
     "Harber"), for so long as Harber is the Beneficial Owner of no more than
     35% of the issued and outstanding Common Stock; provided, however, that
     shares of Common Stock beneficially owned by Roy T. Rimmer solely through
     the grant of stock options (or upon the exercise thereof) by the Company to
     Roy T. Rimmer as a member of the board of directors of the Company shall be
     excluded from the calculation of such percentage; provided, further, that
     at the time the Agreement, dated as of March 10, 2000, by and among the
     Company, Lacy J. Harber and LJH, is terminated or expires in accordance
     with the terms thereof, Harber shall thereupon, and without any further
     action whatsoever, no longer be a "Significant Holder" for purposes of this
     Agreement."

     2. Binding Effect. This Amendment shall be binding upon, and shall inure to
the benefit of, the parties hereto and their respective successors and assigns.

     3. Execution in Counterparts. This Amendment may be executed in
counterparts, each of which shall be deemed an original, but all of which shall
constitute one and the same instrument.
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     4. Governing Law. This Amendment shall be governed by, and interpreted in
accordance with, the laws of the State of Delaware, without regard to principles
of conflict of laws.

     5. Effectiveness. Except as amended hereby, the Rights Agreement shall
remain in full force and effect and shall be otherwise unaffected hereby.

                            [SIGNATURE PAGE FOLLOWS]
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     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed as of the day and year first above written.

                                    AVIATION SALES COMPANY

                                    By: /s/ Dale S. Baker
                                        ------------------------------------
                                    Name: Dale S. Baker
                                    Title: Chairman of the Board and CEO

                                    CONTINENTAL STOCK TRANSFER & TRUST COMPANY,
                                    Rights Agent

                                    By: /s/ Roger Bernhammer
                                        ------------------------------------
                                    Name:  Roger Bernhammer
                                         -----------------------------------
                                    Title:  Vice President
                                           ---------------------------------<PAGE>

                                                                 Exhibit 4.6
                           CERTIFICATE OF TRUST OF
                         ALLEGIANT CAPITAL TRUST II
                         --------------------------

          THIS Certificate of Trust of Allegiant Capital Trust II (the "Trust"),
is being duly executed and filed by Bankers Trust (Delaware), a Delaware
banking corporation, as trustee, to form a business trust under the Delaware
Business Trust Act (12 Del. Code, Section 3801 et seq.) (the "Act").
                       ---------               -- ---

          1. Name. The name of the business trust formed hereby is Allegiant
             ----
Capital Trust II.

          2. Delaware Trustee. The name and business address of the trustee of
             ----------------
the Trust in the State of Delaware is Bankers Trust (Delaware), 1011 Centre
Road, Suite 200, Wilmington, Delaware 19805-1266.

          IN WITNESS WHEREOF, the undersigned, being the sole trustee of the
Trust, has executed this Certificate of Trust in accordance with Section
3811(a) of the Act.

                                          BANKERS TRUST (DELAWARE),
                                            not in its individual capacity but
                                            solely as trustee of the Trust.

                                          By:    /s/ Elizabeth B. Ferry
                                              --------------------------------
                                          Name:  Elizabeth B. Ferry
                                          Title: Trustee<PAGE>

                                                                 Exhibit 4.7

                               TRUST AGREEMENT
                               ---------------

     This TRUST AGREEMENT, dated as of June 6, 2001 (this "Trust
Agreement"), by and between Allegiant Bancorp, Inc., a Missouri corporation
(the "Depositor"), and Bankers Trust (Delaware), a Delaware banking
corporation (the "Trustee"). The Depositor and the Trustee hereby agree as
follows:

          1. The trust created hereby (the "Trust") shall be known as "Allegiant
Capital Trust II" in which name the Trustee, or the Depositor to the extent
provided herein, may engage in the transactions contemplated hereby, make
and execute contracts, and sue and be sued.

          2. The Depositor hereby assigns, transfers conveys and sets over to
the Trustee the sum of $10. The Trustee hereby acknowledges receipt of such
amount in trust from the Depositor, which amount shall constitute the
initial trust estate. The Trustee hereby declares that it will hold the
trust estate in trust for the Depositor. It is the intention of the parties
hereto that the Trust created hereby constitute a business trust under
Chapter 38 of Title 12 of the Delaware Code, 12 Del. C. Section 3801, et seq.
                                                -------               -- ---
(the "Business Trust Act"), and that this document constitutes the
governing instrument of the Trust. The Trustee is hereby authorized and
directed to execute and file a certificate of trust with the Delaware
Secretary of State in accordance with the provisions of the Business Trust
Act.

          3. The Depositor and the Trustee will enter into an amended and
restated Trust Agreement, satisfactory to each such party and substantially
in the form included as an exhibit to the 1933 Act Registration Statement
(as defined below), to provide for the contemplated operation of the Trust
created hereby and the issuance of the Preferred Securities and Common
Securities referred to therein. Prior to the execution and delivery of
such amended and restated Trust Agreement, the Trustee shall not have any
duty or obligation hereunder or with respect to the trust estate, except as
otherwise required by applicable law or as may be necessary to obtain prior
to such execution and delivery any licenses, consents or approvals required
by applicable law or otherwise.

          4. The Depositor and the Trustee hereby authorize and direct the
Depositor, as the sponsor of the Trust, (i) to file with the Securities and
Exchange Commission (the "Commission") and execute, in each case on behalf
of the Trust, (a) the Registration Statement on Form S-3 (the "1933 Act
Registration Statement"), including any pre-effective or post-effective
amendments to the 1933 Act Registration Statement, relating to the
registration under the Securities Act of 1933, as amended, of the Preferred
Securities of the Trust and possibly certain other securities and (b) a
Registration Statement on Form 8-A (the "1934 Act Registration Statement")
(including all pre-effective and post-effective amendments thereto) relating
to the registration of the Preferred Securities of the Trust under the
Securities Exchange Act of 1934, as amended; (ii) to file with The Nasdaq
National Market (the "Exchange") and execute on behalf of the Trust one or
more listing applications and all other applications, statements,
certificates, agreements and other instruments as shall be necessary or
desirable to cause the Preferred Securities to be listed on the Exchange;
(iii) to file and

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execute on behalf of the Trust such applications, reports, surety
bonds, irrevocable consents, appointments of attorney for service of process
and other papers and documents as shall be necessary or desirable to
register the Preferred Securities under the securities or "blue sky" laws
of such jurisdictions as the Depositor, on behalf of the Trust, may deem
necessary or desirable; and (iv) to execute on behalf of the Trust that
certain Underwriting Agreement relating to the Preferred Securities, among
the Trust, the Depositor and the several Underwriters named therein,
substantially in the form included as an exhibit to the 1933 Act
Registration Statement.

     In connection with the filings referred to above, the Depositor hereby
constitutes and appoints Shaun R. Hayes and Thomas A. Daiber, and each of
them, as its true and lawful attorneys-in-fact and agents, with full power
of substitution and resubstitution, for the Depositor or in the Depositor's
name, place and stead, in any and all capacities, to sign any and all
amendments (including post-effective amendments) to the 1933 Act Registration
Statement and the 1934 Act Registration Statement and to file the same, with
all exhibits thereto, and other documents in connection therewith, with the
Commission, the Exchange and administrators of state securities or "blue sky"
laws, granting unto said attorneys-in-fact and agents full power and authority
to do and perform each and every act and thing requisite and necessary to be
done in connection therewith, as fully to all intents and purposes as the
Depositor might or could to in person, hereby ratifying and confirming all
that said attorneys-in-fact and agents or any of them, or their respective
substitute or substitutes, shall do or cause to be done by virtue hereof.

          5. This Trust Agreement may be executed in one or more counterparts.

          6. The number of Trustees initially shall be one (1) and thereafter
the number of Trustees shall be such number as shall be fixed from time to
time by a written instrument signed by the Depositor which may increase or
decrease the number of Trustees; provided, however, that to the extent
required by the Business Trust Act, one Trustee shall either be a natural
person who is a resident of the State of Delaware or, if not a natural
person, an entity which has its principal place of business in the State of
Delaware and otherwise meets the requirements of applicable Delaware law.
Subject to the foregoing, the Depositor is entitled to appoint or remove
without cause any Trustee at any time. The Trustees may resign upon thirty
(30) days' prior notice to the Depositor.

                                     2

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          7. This Trust Agreement shall be governed by, and construed in
accordance with, the laws of the State of Delaware (without regard to
conflict of laws of principles).

          8. This Trust Agreement may be amended by written agreement of the
parties hereto.

                          [SIGNATURE PAGE FOLLOWS]

                                     3

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     IN WITNESS WHEREOF, the parties hereto have caused this Trust Agreement
to be duly executed as of the day and year first above written.

                                     ALLEGIANT BANCORP, INC.,
                                     as Depositor

                                     By: /s/ Thomas A. Daiber
                                        -----------------------------------
                                     Name: Thomas A. Daiber
                                     Title: Executive Vice President

                                     BANKERS TRUST (DELAWARE),
                                     as Trustee

                                     By: /s/ Elizabeth B. Ferry
                                        -----------------------------------
                                     Name: Elizabeth B. Ferry
                                     Title: Trustee

                                         4

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