Document:

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                                                                    Exhibit 4.24

                              CLASS D CERTIFICATE

                            REGISTERED $137,268,000
                         Fractional Undivided Interest

No. R - 1                                                 CUSIP NO. 909317 BD 0

     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE TRUSTEE OR ITS
                                                   ---
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IN EXCHANGE FOR THIS CERTIFICATE IS REGISTERED IN THE NAME OF CEDE & CO.
OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC
(AND ANY PAYMENT HEREON IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER
USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS
THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

     TRANSFERS OF THIS CERTIFICATE SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT
NOT IN PART, TO NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR'S
NOMINEE AND TRANSFERS OF PORTIONS OF THIS CERTIFICATE SHALL BE LIMITED TO
TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN SECTION 3.05 OF
THE PASS THROUGH TRUST AGREEMENT REFERRED TO HEREIN.

     EITHER: (A) THE HOLDER IS NOT ACQUIRING THIS CERTIFICATE OR AN INTEREST
HEREIN WITH PLAN ASSETS OF ANY PLAN OR AN INDIVIDUAL RETIREMENT PLAN SUBJECT TO
TITLE I OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED
("ERISA"), OR SECTION 4975 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE
"CODE"); OR (B) THE HOLDER'S PURCHASE AND HOLDING OF THIS CERTIFICATE OR AN
INTEREST HEREIN ARE EXEMPT FROM THE PROHIBITED TRANSACTION RESTRICTIONS OF
SECTION 406(A) OF ERISA AND SECTION 4975 OF THE CODE BY AN ADMINISTRATIVE CLASS
PROHIBITED TRANSACTION EXEMPTION GRANTED BY THE DEPARTMENT OF LABOR.
<PAGE>

              UNITED AIRLINES 2001-1D ENHANCED PASS THROUGH TRUST

                     UNITED AIRLINES ENHANCED PASS THROUGH
                          CERTIFICATE, SERIES 2001-1D

          Final Expected Regular Distribution Date: September 1, 2006

evidencing a fractional undivided interest in a trust, the property of which
includes certain equipment notes each secured by an Aircraft owned by United Air
Lines, Inc.

     THIS CERTIFIES THAT CEDE & CO., for value received, is the registered owner
of a ONE HUNDRED THIRTY-SEVEN MILLION TWO HUNDRED SIXTY-EIGHT THOUSAND DOLLAR
($137,268,000) Fractional Undivided Interest in the United Airlines 2001-1D Pass
Through Trust (the "Trust") created by State Street Bank and Trust Company of
Connecticut, National Association, as trustee (the "Trustee") pursuant to a Pass
Through Trust Agreement, dated as of August 22, 2001 (the "Basic Agreement"), as
supplemented by Trust Supplement No. 2001-1D (collectively, the "Agreement")
between the Trustee and United Air Lines, Inc., a Delaware corporation (the
"Company"), a summary of certain of the pertinent provisions of which is set
forth below. To the extent not otherwise defined herein, the capitalized terms
used herein have the meanings assigned to them in the Agreement. This
Certificate is one of the duly authorized Certificates designated as "United
Airlines Enhanced Pass Through Certificates, Series 2001-1D" (the
"Certificates"). This Certificate is issued under and is subject to the terms,
provisions and conditions of the Agreement.

     By virtue of its acceptance hereof, the Certificateholder of this
Certificate assents to and agrees to be bound by the provisions of the
Agreement, the Intercreditor Agreement and the Note Purchase Agreement. The
property of the Trust includes (i) certain Notes and all monies at any time paid
thereon and all monies due and to become due thereunder, (ii) funds from time to
time deposited in the related Escrow Account, the related Certificate Account
and the related Special Payments Account and (iii) all rights of such Trust and
the Trustee, on behalf of such Trust, under the Intercreditor Agreement and the
Note Purchase Agreement, including all rights to receive certain payments
thereunder and all monies paid to such Trustee on behalf of such Trust pursuant
to the Intercreditor Agreement and the Note Purchase Agreement (the "Trust
Property"). Each issue of the Notes is secured directly or indirectly by, among
other things, a security interest in the Aircraft owned by the Company.

     The Certificates represent Fractional Undivided Interests in the Trust
and the Trust Property, and have no rights, benefits or interest in respect of
any assets or property of any trust of another class.

     The Certificates shall not have the benefit of any liquidity facility.

     Interest applicable to this Certificate will be payable at a rate equal
to 7.371%.

     Subject to and in accordance with the terms of the Agreement, the
Intercreditor Agreement and the Note Purchase Agreement, from and to the extent
of funds then available to the Trustee, there shall be distributed on each March
1 and September 1 (a "Regular Distribution Date"), commencing on March 1, 2002,
to the Person in whose name this
<PAGE>

Certificate is registered at the close of business on the 15th day preceding
such Regular Distribution Date, an amount in respect of the Scheduled Payments
on the Notes due on such Regular Distribution Date, the receipt of which has
been confirmed by the Trustee, equal to the product of the percentage interest
in the Trust evidenced by this Certificate and an amount equal to the sum of
such Scheduled Payments. Subject to and in accordance with the terms of the
Agreement, the Intercreditor Agreement and the Note Purchase Agreement, if
Special Payments on the Notes are received by the Trustee, from funds then
available to the Trustee, there shall be distributed on the applicable Special
Distribution Date, to the Person in whose name this Certificate is registered at
the close of business on the 15th day preceding the Special Distribution Date,
an amount in respect of such Special Payments on the Notes, the receipt of which
has been confirmed by the Trustee, equal to the product of the percentage
interest in the Trust evidenced by this Certificate and an amount equal to the
sum of such Special Payments so received. If a Regular Distribution Date or
Special Distribution Date is not a Business Day, distribution shall be made on
the next Business Day with the same force and effect as if made on such Regular
Distribution Date or Special Distribution Date and interest shall accrue during
the intervening period. The Trustee shall mail notice of each Special Payment
and the Special Distribution Date therefor to the Certificateholder of this
Certificate.

     Except as otherwise provided in the Agreement and notwithstanding the
above, the final distribution on this Certificate shall be made after notice
mailed by the Trustee of the pendency of such distribution and only upon
presentation and surrender of this Certificate at the office or agency of the
Trustee specified in such notice.

     THE AGREEMENT AND THIS CERTIFICATE SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK (WITHOUT REGARD TO THE
PRINCIPLES OF CONFLICTS OF LAWS THEREOF (OTHER THAN SECTION 5-1401 OF THE NEW
YORK GENERAL OBLIGATIONS LAW)) AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE
HOLDER OF THIS CERTIFICATE UNDER THE AGREEMENT SHALL BE DETERMINED IN ACCORDANCE
WITH SUCH LAWS.

     Reference is hereby made to the further provisions of this Certificate set
forth in the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

     Unless the certificate of authentication hereon has been executed by the
Trustee, by manual signature, this Certificate shall not be entitled to any
benefit under the Agreement or be valid or obligatory for any purpose.
<PAGE>

     IN WITNESS WHEREOF, the Trustee, on behalf of the Issuer and not in its
individual capacity, has caused this Certificate to be duly executed.

                                      UNITED AIRLINES 2001-1D PASS
                                      THROUGH TRUST

                                      By:  STATE STREET BANK AND TRUST COMPANY
                                           OF CONNECTICUT, NATIONAL ASSOCIATION,
                                           not in its individual capacity but
                                           solely as Trustee

Dated: August 22, 2001                By: /s/ John G. Correia
      ---------------------              -------------------------------
                                      Name: John G. Correia
                                           -----------------------------
                                      Title: Assistant Vice President
                                            ----------------------------
<PAGE>

                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

         This is one of the Certificates referred to in the within-mentioned
Trust Agreement.

STATE STREET BANK AND TRUST                  STATE STREET BANK AND TRUST
COMPANY OF CONNECTICUT,                      COMPANY OF CONNECTICUT,
NATIONAL ASSOCIATION, not in its             NATIONAL ASSOCIATION, not in its
individual capacity but solely               individual capacity but solely
as Trustee                                   as Trustee

By: /s/ John G. Correia                      By: /s/ John G. Correia
   ----------------------------                 -------------------------------
                                                     Authenticating Agent

                                             By: /s/ John G. Correia
                                                -------------------------------
<PAGE>

                           [REVERSE OF CERTIFICATE]

     The Certificates do not represent a direct obligation of, or an obligation
guaranteed by, or an interest in, the Company or the Trustee or any of their
Affiliates. The Certificates are limited in right or payment, all as more
specifically set forth on the face hereof and in the Agreement. All payments or
distributions made to Certificateholders under the Agreement shall be made only
from the Trust Property and only to the extent that the Trustee shall have
sufficient income or proceeds from the Trust Property to make such payments in
accordance with the terms of the Agreement. Each Certificateholder of this
Certificate, by its acceptance hereof, agrees that it shall look solely to the
income and proceeds from the Trust Property to the extent available for
distribution to such Certificateholder as provided in the Agreement. This
Certificate does not purport to summarize the Agreement and reference is made to
the Agreement for information with respect to the interests, rights, benefits,
obligations, proceeds and duties evidenced hereby. A copy of the Agreement may
be examined during normal business hours at the principal office of the Trustee,
and at such other places, if any, designated by the Trustee, by any
Certificateholder upon request.

     The Agreement permits, with certain exceptions therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Certificateholders under the Agreement at any time
by the Company and the Trustee with the consent of the Certificateholders
holding Certificates evidencing Fractional Cumulative Interests aggregating not
less than a majority in interest in the Trust. Any such consent by the
Certificateholder of this Certificate shall be conclusive and binding on such
Certificateholder and upon all future Certificateholders of this Certificate and
of any Certificate issued upon the transfer hereof or in exchange hereof or in
lieu hereof whether or not notation of such consent is made upon this
Certificate. The Agreement also permits the amendment thereof, in certain
limited circumstances, without the consent of the Certificateholders of any of
the Certificates.

     As provided in the Agreement and subject to certain limitations therein set
forth, the transfer of this Certificate is registrable in the Register upon
surrender of this Certificate for registration of transfer at the offices or
agencies maintained by the Trustee in its capacity as Registrar, or by any
successor Registrar, at its Corporate Trust Office, duly endorsed or accompanied
by a written instrument of transfer in form satisfactory to the Trustee and the
Registrar duly executed by the Certificateholder hereof or such
Certificateholder's attorney duly authorized in writing, and thereupon one or
more new Certificates of authorized denominations evidencing the same aggregate
Fractional Undivided Interest in the Trust shall be issued to the designated
transferee or transferees.

     The Certificates are issuable only as registered Certificates without
coupons in minimum denominations of $1,000 Fractional Undivided Interest and
integral multiples of $1,000 in excess thereof. As provided in the Agreement and
subject to certain limitations therein set forth, the Certificates are
exchangeable for new Certificates of authorized denominations evidencing the
same aggregate Fractional Undivided Interest in the Trust, as requested by the
Certificateholder surrendering the same.
<PAGE>

     No service charge shall be made for any such registration of transfer or
exchange, but the Trustee shall require payment by the Certificateholder of a
sum sufficient to cover any tax or governmental charge payable in connection
therewith.

     The Trustee, the Registrar, and any agent of the Trustee or the Registrar
may treat the person in whose name this Certificate is registered as the owner
hereof for all purposes, and neither the Trustee, the Registrar, nor any such
agent shall be affected by any notice to the contrary.

     The obligations and responsibilities created by the Agreement and the Trust
created thereby shall terminate upon the distribution to Certificateholders of
all amounts required to be distributed to them pursuant to the Agreement and the
disposition of all property held as part of the Trust Property.<PAGE>
                                                                    EXHIBIT 10.1

                           ENCORE ACQUISITION COMPANY

2000 INCENTIVE STOCK PLAN

SECTION 1.        Purpose; Definitions.

         The purpose of the Plan is to attract, motivate and retain selected
employees of the Company and to provide the Company with the ability to provide
incentives more directly linked to the profitability of the Company's businesses
and increases in shareholder value.

         For purposes of the Plan, the following terms are defined as set forth
below:

                  a. "Awards" mean grants under this Plan of Stock Options or
         Restricted Stock.

                  b. "Board" means the Board of Directors of the Company.

                  c. "Code" means the Internal Revenue Code of 1986, as amended
         from time to time, and any successor thereto.

                  d. "Commission" means the Securities and Exchange Commission
         or any successor agency.

                  e. "Committee" means the Board unless, and until, a
         Compensation Committee of the Board, or a subcommittee thereof, any
         successor thereto or such other committee or subcommittee, shall be
         designated by the Board to administer the Plan.

                  f. "Common Stock" or "Stock" means the $0.01 par value Common
         Stock of the Company.

                  g. "Company" means Encore Acquisition Company, a corporation
         organized under the laws of the State of Delaware, and its
         subsidiaries.

                  h. "Exercise Period" means the 60-day period from and after a
         Change in Control.

                  i. "Exchange Act" means the Securities Exchange Act of 1934,
         as amended from time to time, and any successor thereto.

                  j. "Fair Market Value" means, as of any given date, the
         closing sale price of the Common Stock for such date on The New York
         Stock Exchange or, if no such sale price of Common Stock is reported on
         such date, the fair market value of the Common Stock as determined by
         the Committee in good faith. Under no circumstances shall the Fair
         Market Value be less than the par value of the Common Stock.

                  k. "Incentive Stock Option" means any Stock Option that
         complies with Section 422 of the Code.

                  l. "Nonqualified Stock Option" means any Stock Option that is
         not an Incentive Stock Option.

                  m. "Plan" means this 2000 Incentive Stock Plan, as amended
         from time to time.

                  n. "Restricted Period" means the period during which an Award
         may not be sold, assigned, transferred, pledged or otherwise
         encumbered.

                  o. "Restricted Stock" means an Award of shares of Common Stock
         pursuant to Section 5(c).

                  p. "Spread Value" means, with respect to a share of Common
         Stock subject to an Award, an amount equal to the excess of the Fair
         Market Value, on the date such value is determined, over the Award's
         exercise or grant price, if any.

<PAGE>

                  q. "Stock Option" means an option granted pursuant to Section
         5(a).

         In addition, the terms "Business Combination," "Change in Control,"
"Change in Control Price," "Incumbent Board," "Outstanding Company Stock,"
"Outstanding Company Voting Securities" and "Person" have the meanings set forth
in Section 6.

SECTION 2.        Administration.

         The Plan shall be administered by the Committee, which shall have the
power to interpret the Plan and to adopt such rules and guidelines for carrying
out the Plan as it may deem appropriate. The Committee shall have the authority
to adopt such modifications, procedures and subplans as may be necessary or
desirable to comply with the laws, regulations, compensation practices and tax
and accounting principles of the countries in which the Company, a subsidiary or
an affiliate may operate to assure the viability of the benefits of Awards made
to individuals employed in such countries and to meet the objectives of the
Plan.

         Subject to the terms of the Plan, the Committee shall have the
authority to determine those employees eligible to receive Awards and the
amount, type and terms of each Award.

         The Committee may delegate its authority and power under the Plan to
one or more officers of the Company, subject to guidelines prescribed by the
Committee and approved by the Board, with respect to participants who are not
subject to Section 16 of the Exchange Act.

         Any determination made by the Committee or pursuant to delegated
authority in accordance with the provisions of the Plan with respect to any
Award shall be made in the sole discretion of the Committee or such delegate,
and all decisions made by the Committee or any appropriately designated officer
pursuant to the provisions of the Plan shall be final and binding on all
persons, including the Company and Plan participants.

SECTION 3.        Eligibility.

         All directors and all full time regular employees of the Company and
its subsidiaries and affiliates are eligible to be granted Awards under the
Plan.

SECTION 4.        Common Stock Subject to Plan.

         The total number of shares of Common Stock reserved and available for
distribution pursuant to the Plan shall be 1,802,000 shares, and the maximum
number of shares that can be issued to any participant is 250,000 shares. If any
Award is exercised, cashed out, or terminates or expires without a payment being
made to the participant in the form of Common Stock, the shares subject to such
Award, if any, shall again be available for distribution in connection with
Awards under the Plan. Any shares of Common Stock that are used by a participant
as full or partial payment of withholding or other taxes or as payment for the
exercise or conversion price of an Award shall be available for distribution in
connection with Awards under the Plan.

         In the event of any merger, reorganization, consolidation,
recapitalization, stock dividend, stock split, split-up, or other change in
corporate structure affecting the Common Stock after adoption of the Plan by the
Board, the Board is authorized to make substitutions or adjustments in the
aggregate number and kind of shares reserved and available for issuance under
the Plan, in the number, kind and price of shares subject to outstanding Awards
and in the Award limits set forth in Section 5; provided, however, that any such
substitutions or adjustments shall be, to the extent deemed appropriate by the
Board, consistent with the treatment of shares of Common Stock not subject to
the Plan, and that the number of shares subject to any Award shall always be a
whole number.

SECTION 5.        Awards.

         The types of Awards that may be granted under the Plan are set forth
below. Awards may be granted singly, in combination, or in tandem with other
Awards. Each Award will be set forth in a separate agreement with the person
receiving the Award and will indicate the type, terms and conditions of the
Award.

                                        2
<PAGE>

         (a) Stock Options. (i) A Stock Option represents the right to purchase
a share of Stock at a predetermined grant price. Stock Options granted under
this Plan may be in the form of Incentive Stock Options or Nonqualified Stock
Options, as specified in the Award agreement. The terms of each Stock Option
shall be set forth in the Award agreement. Subject to the applicable Award
agreement, Stock Options may be exercised, in whole or in part, by giving
written notice of exercise to the Company specifying the number of shares to be
purchased. Such notice shall be accompanied by payment in full of the purchase
price by certified or bank check or such other instrument as the Company may
accept (including a copy of instructions to a broker or bank acceptable to the
Company to deliver promptly to the Company an amount of sale or loan proceeds
sufficient to pay the purchase price). As determined by the Committee, payment
in full or in part may also be made in the form of Common Stock already owned by
the optionee valued at the Fair Market Value on the date the Stock Option is
exercised; provided, however, that such Common Stock shall not have been
acquired within the preceding six months upon the exercise of a Stock Option
Award granted under the Plan or any other plan maintained at any time by the
Company or any subsidiary.

         (ii) Incentive Stock Options will be designed to comply with the
provisions of the Code and will be subject to certain restrictions contained in
the Code. Among such restrictions, Incentive Stock Options must have an exercise
price not less than the Fair Market Value of a share of Common Stock on the date
of grant, must expire within a specified period of time following the optionee's
termination of employment, and must be exercised within ten years after the date
of grant; but may be subsequently modified to disqualify them from treatment as
Incentive Stock Options. In the case of an Incentive Stock Option granted to an
individual who owns (or is deemed to own) at least 10% of the total combined
voting power of all classes of stock of the Company, the exercise price must be
at least 110% of the Fair Market Value of a share of Common Stock on the date of
grant and the Incentive Stock Option must expire no later than the fifth
anniversary of the date of its grant. The aggregate Fair Market Value
(determined at the time the option was granted) of the Common Stock with respect
to which Incentive Stock Options are exercisable for the first time by a
participant during any calendar year shall not exceed $100,000 (or such other
limit as may be required by the Code).

         (iii) Nonqualified Stock Options will provide for the right to purchase
Common Stock at a specified price which, except with respect to Nonqualified
Stock Options intended to qualify as performance-based compensation under
Section 162(m) of the Code, may be less than Fair Market Value on the date of
grant (but not less than 85% of fair market value) and usually will become
exercisable (in the discretion of the Committee) in one or more installments
after the grant date.

         (b) Restricted Stock. Shares of Restricted Stock are shares of Common
Stock that are Awarded to a participant and that during the Restricted Period
may be forfeitable to the Company upon such conditions as may be set forth in
the applicable Award agreement (including, without limitation, a specified
period of employment or the satisfaction of pre-established performance goals,
when granted to executive officers). The Committee may grant Awards of
Restricted Stock to such persons, in such amounts and subject to such terms and
conditions as the Committee may determine in its sole discretion; provided,
however that shares of Restricted Stock granted to executive officers may only
vest upon the attainment of performance goals pre-established by the Committee
based on one or more of the following criteria; return on equity; pre-tax or
after tax income; reserve levels; revenues; return on assets; increases in
EBITDA: share price; increase in equity; debt reduction; or such other criteria
as the Company's stockholders may approve. Restricted Stock may not be sold,
assigned, transferred, pledged, or otherwise encumbered during the Restricted
Period. Except as provided in this subsection (b) and in the applicable Award
agreement, a participant shall have all the rights of a holder of Common Stock,
including the rights to receive dividends and to vote during the Restricted
Period. Dividends with respect to Restricted Stock that are payable in Common
Stock shall be paid in the form of Restricted Stock.

SECTION 6.        Change in Control Provisions.

         (a) Impact of Event. Notwithstanding any other provision of the Plan to
the contrary, in the event of a Change in Control, unless the Committee
otherwise determines prior to such change in Control:

                  (i) All Stock Options outstanding as of the date such Change
         in Control occurs shall become fully vested and exercisable.

                  (ii) The restrictions and other conditions applicable to any
         Restricted Stock, including vesting requirements, shall lapse, and such
         Awards shall become free of all restrictions and fully vested.

                  (iii) The value of all outstanding Stock Options and
         Restricted Stock shall, unless otherwise determined by the Committee at
         or after grant, be cashed out on the basis of the "Change in Control
         Price," as defined in Section 6(c), as of the date such Change in
         Control occurs or such other date as the Committee may determine prior
         to the Change in Control.

                                        3
<PAGE>
         (b) Definition of Change in Control. A "Change in Control" means the
happening of any of the following events:

                  (i) The acquisition by any individual, entity or group (within
         the meaning of Section 13(d)(3) or 14(d)(2) of the Exchange Act (a
         "Person")) of beneficial ownership (within the meaning of Rule 13d-3
         promulgated under the Exchange Act) of 40% or more of either (A) the
         then outstanding shares of Common Stock (the "Outstanding Company
         Common Stock") or (B) the combined voting power of the then outstanding
         voting securities of the Company entitled to vote generally in the
         election of directors (the "Outstanding Company Voting Securities");
         provided, however, that the following acquisitions shall not constitute
         a Change in Control: (1) any acquisition directly from the Company, (2)
         any acquisition by the Company, (3) any acquisition by any employee
         benefit plan (or related trust) sponsored or maintained by the Company
         or any corporation controlled by the Company or (4) any acquisition by
         any corporation pursuant to a transaction described in clauses (A), (B)
         and (C) of paragraph (iii) of this Section 6(b) or (5) any acquisition
         by a Person that owns on the date this Plan is adopted by the Board of
         Directors more than 20% of the outstanding capital stock of the Company
         at such date; or

                  (ii) Individuals who, as of the effective date of the Plan,
         constitute the Board (the "Incumbent Board") cease for any reason to
         constitute at least a majority of the Board; provided, however, that
         any individual becoming a director subsequent to such effective date
         whose election, or nomination for election by the stockholders of the
         Company, was approved by a vote of at least a majority of the directors
         then comprising the Incumbent Board shall be considered as though such
         individual were a member of the Incumbent Board, but excluding, for
         this purpose, any such individual whose initial assumption of office
         occurs as a result of an actual or threatened election contest with
         respect to the election or removal of directors or other actual or
         threatened solicitation of proxies or consents by or on behalf of a
         Person other than the Board; or

                  (iii) Approval by the stockholders of the Company of a
         reorganization, merger, share exchange or consolidation (a "Business
         Combination"), unless, in each case following such Business
         Combination, (A) all or substantially all of the individuals and
         entities who were the beneficial owners, respectively, of the
         Outstanding Company Common Stock and Outstanding Company Voting
         Securities immediately prior to such Business Combination beneficially
         own, directly or indirectly, more than 60% of, respectively, the then
         outstanding shares of common stock and the combined voting power of the
         then outstanding voting securities entitled to vote generally in the
         election of directors, as the case may be, of the corporation resulting
         from such Business Combination (including, without limitation, a
         corporation that as a result of such transaction owns the Company
         through one or more subsidiaries) in substantially the same proportions
         as their ownership, immediately prior to such Business Combination of
         the Outstanding Company Common Stock and Outstanding Company Voting
         Securities, as the case may be, (B) no Person (excluding any employee
         benefit plan (or related trust) of the Company or such corporation
         resulting from such Business Combination) beneficially owns, directly
         or indirectly, 40% or more of, respectively, the then outstanding
         shares of common stock of the corporation resulting from such Business
         Combination or the combined voting power of the then outstanding voting
         securities of such corporation except to the extent that such Person
         owned 40% or more of the Outstanding Company Common Stock or
         Outstanding Company Voting Securities prior to the Business Combination
         and (C) at least a majority of the members of the board of directors of
         the corporation resulting from such Business Combination were members
         of the Incumbent Board at the time of the execution of the initial
         agreement, or of the action of the Board, providing for such Business
         Combination; or

                  (iv) Approval by the stockholders of the Company of (A) a
         complete liquidation or dissolution of the Company or (B) the sale or
         other disposition of all or substantially all of the assets of the
         Company, other than to a corporation with respect to which, following
         such sale or other disposition, (1) more than 60% of, respectively, the
         then outstanding shares of common stock of such corporation and the
         combined voting power of the then outstanding voting securities of such
         corporation entitled to vote generally in the election of directors is
         then beneficially owned, directly or indirectly, by all or
         substantially all of the individuals and entities who were the
         beneficial owners, respectively, of the Outstanding Company Common
         Stock and Outstanding Company Voting Securities immediately prior to
         such sale or other disposition in substantially the same proportion as
         their ownership, immediately prior to such sale or other disposition,
         of the Outstanding Company Common Stock and Outstanding Company Voting
         Securities, as the case may be, (2) less than 40% of, respectively, the
         then outstanding shares of common stock of such corporation and the
         combined voting power of the then outstanding voting securities of such
         corporation entitled to vote generally in the election of directors is
         then beneficially owned, directly or indirectly, by any Person
         (excluding any employee benefit plan (or related trust) of the Company
         or such corporation), except to the extent that such Person owned 40%
         or more of the Outstanding Company Common Stock or Outstanding Company
         Voting Securities prior to the sale or disposition and (3) at least a
         majority of the members of the board of directors of such corporation
         were members of the Incumbent Board at the time of the execution of the
         initial agreement, or of the action of the Board, providing for such
         sale or other disposition of assets of the Company or were elected,
         appointed or nominated by the Board.

                                        4
<PAGE>

         (c) Change in Control Price. "Change in Control Price" means the
highest closing price per share paid for the purchase of Common Stock on the New
York Stock Exchange at any time during the preceding 60-day period ending on the
date the Change in Control occurs, except that, in the case of Incentive Stock
Options, such price shall be based only on transactions reported for the date on
which such Incentive Stock Options are cashed out.

         (d) Notwithstanding any other provision of this Plan, upon a Change in
Control, unless the Committee shall determine otherwise at grant, an Award
recipient shall have the right, by giving notice to the Company within the
Exercise Period, to elect to surrender all or part of the Stock Option to the
Company and to receive in cash, within 30 days of such notice, an amount equal
to the amount by which the "Change in Control Price" on the date of such notice
shall exceed the exercise or grant price under such Award, multiplied by the
number of shares of Stock as to which the right granted under this Section 6
shall have been exercised.

         (e) Notwithstanding the foregoing, if any right granted pursuant to
this Section 6 would make a Change in Control transaction ineligible for pooling
of interests accounting under generally accepted accounting principles that but
for this Section 6 would otherwise be eligible for such accounting treatment,
the Committee shall have the ability to substitute the cash payable pursuant to
this Section 6 with Common Stock with a Fair Market Value equal to the cash that
would otherwise be payable hereunder.

SECTION 7.        Plan Amendment and Termination.

         The Board may amend or terminate the Plan at any time, provided that no
such amendment shall be made without stockholder approval if such approval is
required under applicable law, or if such amendment would: (i) decrease the
grant or exercise price of any Stock Option to less than the minimum price set
forth herein on the date of grant; or (ii) increase the total number of shares
of Common Stock that may be distributed under the Plan.

         Except as set forth in any Award agreement, no amendment or termination
of the Plan may materially and adversely affect any outstanding Award under the
Plan without the Award recipient's consent.

SECTION 8.  Transferability.

         No Award shall be transferable or assignable, or payable to or
exercisable by, anyone other than the participant to whom it was granted, except
(i) by law, will or the laws of descent and distribution, (ii) as a result of
the disability of a participant or (iii) that the Committee may permit transfers
of Awards by gift or otherwise to a member of a participant's immediate family
and/or trusts whose beneficiaries are members of the participant's immediate
family, or to such other persons or entities as may be approved by the
Committee. Notwithstanding the foregoing, in no event shall Incentive Stock
Options be transferable or assignable other than by will or by the laws of
descent and distribution.

SECTION 9.  Award Agreements.

         Each Award under the Plan shall be evidenced by a written agreement
that sets forth the terms, conditions, and limitations for each Award. Such
terms may include, but are not limited to, the term of the Award, vesting and
forfeiture provisions, and the provisions applicable in the event the
recipient's employment terminates. The Committee may amend an Award Agreement,
provided that no such amendment may materially and adversely affect an Award
without the Award recipient's consent.

SECTION 10.  Effective Date; Term.

         The Plan shall become effective as of the date of its adoption by the
Board, March 8, 2001, subject to the approval by the holders of a majority of
the shares of common stock then outstanding. Except as otherwise provided by the
Board, no Awards shall be granted after March 8, 2011, but any Awards granted
theretofore may extend beyond that date.

SECTION 11.  General Provisions.

         (a) The Committee may require each person acquiring shares of Common
Stock pursuant to an Award to represent to and agree with the Company in writing
that such person is acquiring the shares without a view to the distribution
thereof. The certificates for such shares may include any legend that the
Committee deems appropriate to reflect any restrictions on transfer.

                                        5
<PAGE>

         All certificates for shares of Common Stock delivered under the Plan
shall be subject to such stock transfer orders and other restrictions as the
Committee may deem advisable under the rules, regulations, and other
requirements of the Commission, any stock exchange upon which the Common Stock
is then listed, and any applicable Federal, state or foreign securities law, and
the Committee may cause a legend or legends to be put on any such certificates
to make appropriate reference to such restrictions.

         (b) It is presently intended that the Plan constitute an "unfunded"
plan for incentive and deferred compensation. The Committee may authorize the
creation of trusts or other arrangements to meet the obligations created under
the Plan to deliver Common Stock or make payments; provided, however, that,
unless the Committee otherwise determines, the existence of such trusts or other
arrangements is consistent with the "unfunded" status of the Plan.

         (c) Nothing contained in this Plan shall prevent the Company, a
subsidiary, or an affiliate from adopting other or additional compensation
arrangements for its employees.

         (d) The adoption of the Plan shall not confer upon any employee any
right to continued employment nor shall it interfere in any way with the right
of the Company, a subsidiary, or an affiliate to terminate the employment of any
employee at any time.

         (e) No later than the date as of which an amount first becomes
includible in the gross income of the participant for Federal income tax
purposes with respect to any Award under the Plan, the participant shall pay to
the Company, or make arrangements satisfactory to the Company regarding the
payment of, any Federal, state, local, or foreign taxes of any kind required by
law to be withheld with respect to such amount. Unless otherwise determined by
the Committee, withholding obligations arising from an Award may be settled with
Common Stock, including Common Stock that is part of, or is received upon
exercise or conversion of, the Award that gives rise to the withholding
requirement. The obligations of the Company under the Plan shall be conditional
on such payment or arrangements, and the Company and its subsidiaries and
affiliates shall, to the extent permitted by law, have the right to deduct any
such taxes from any payment otherwise due to the participant. The Committee may
establish such procedures as it deems appropriate, including the making of
irrevocable elections, for the settling of withholding obligations with Common
Stock.

         (f) On receipt of written notice of exercise, the Committee may elect
to cash out all or a portion of the shares of Common Stock for which a Stock
Option is being exercised by paying the optionee an amount, in cash or Common
Stock, equal to the Spread Value of such shares on the date such notice of
exercise is received.

         (g) The Plan and all Awards made and actions taken thereunder shall be
governed by and construed in accordance with the laws of the State of Delaware.

         (h) If any provision of the Plan is held invalid or unenforceable, the
invalidity or unenforceability shall not affect the remaining parts of the Plan,
and the Plan shall be enforced and construed as if such provision had not been
included.

                                        6

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