Document:

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                                                                    Exhibit 4.13

                               AMENDMENT NO. 1 TO
                    AMENDED AND RESTATED CONSORTIUM AGREEMENT

     Amendment No. 1 to Amended and Restated Consortium Agreement, dated as of
December 13, 2005 (this "Amendment"), by and among Aeroports de Paris ("ADP") a
French state-owned entity with legal capacity and its own assets, Aeroinvest,
S.A. de C.V. ("Aeroinvest"), a sociedad anonima de capital variable organized
under the laws of the United Mexican States ("Mexico"), Vinci Airports, S.A.S.
("VASA"), a corporation organized under the laws of France, Constructorao ICA,
S.A. de C.V. ("CICASA") and Controladora de Operaciones de Infraestructura, SA,
de C.V. ("COINSA"), as joint and several obligors of Aeroinvest, and Vinci, S.A.
("VINCI") as obligor of VASA, with the acknowledgment and agreement of Servicios
de Tecnologia Aeroportuaria, S.A. de C.V. ("SETA").

     WHEREAS, as of the date of this Amendment ADP, Aeroinvest and VASA are the
shareholders (the "Shareholders") of SETA, with ownership interests of 25.50%,
37.25% and 37.25%, respectively, in the capital stock of SETA, with shareholder
loans against SETA in the principal outstanding amounts of US$5,526,041.50,
US$8,072,353.37 and US$8,072,353.37, respectively, and with contributions made
for future capital increases in SETA in the amounts of $58,041,570 Mexican
pesos, $84,786,215 Mexican pesos, and $84,786,215 Mexican pesos, respectively,

     WHEREAS, the Shareholders, CICASA, COINSA, and VINCI are bound by the
Amended and Restated Consortium Agreement, dated as of July 6, 2004 (as amended
or supplemented to the date hereof, the "ARCA") which, among other things
establishes rules regarding the governance of SETA and Grupo Aeroportuario del
Centro Norte, S.A. de C,V, ("GACN").

     WHEREAS, SETA Is the Strategic Partner of GACN with an ownership interest
of 15% of the capital stock of GACN, held through a Mexican trust with Banco
Nacional de Comercio Exterior, Sociedad Nacional de Credito, Division
Fiduciaria.

     WHEREAS, in a proposed transaction (the "VASA Transaction") COINSA wishes
to purchase from VASA, and VASA Is willing to sell to COINSA, all of VASA's
interest in SETA consisting of a 37.25% ownership interest in SETA, a loan
against SETA In the principal outstanding amount of US$8,072,353.37 and a
contribution In the amount of $84,786,215 Mexican pesos for future capital
increases in SETA (together, the "VASA Interest"), in the terms and subject to
the conditions set forth in that certain Stock Purchase Agreement dated as of
September 14, 2005, between VASA and COINSA, a true and complete copy of which
is attached hereto as Annex A (the "VASA Transaction Documents").

     WHEREAS, immediately following the acquisition of the VASA Interest by
COINSA, COINSA will transfer the VASA Interest to Aeroinvest (the
"COINSA/Aeroinvest Transaction"), in the terms and subject to the conditions set
forth in that certain Stock Purchase Agreement to be dated and effective
concurrently with the closing of the VASA Transaction, a true and complete copy
of which is attached hereto as Annex B, which will result in an increase of
Aeroinvest's ownership interest in SETA to 74.5% of the capital stock of SETA.

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     WHEREAS, In a proposed transaction (the "NAFIN Transaction") Aeroinvest
wishes to purchase 36% of GACN's capital stock from the Mexican Government
through National Financiera, Sociedad Nacional de Credito, Direccion Fiduciaria
("NAFIN"), as trustee of a Mexican trust holding and controlling 85% of GACN's
capital stock, pursuant to the exercise of the option set forth in Section 3.4
of the Participation Agreement to purchase 36% of GACN capital stock (the "36%
Option"), which 36% Option was assigned by SETA to Aeroinvest in the terms and
subject to the conditions set forth in that certain Rights and Obligations
Assignment Agreement dated as of June 14, 2005, by and among SETA, as assignor,
Aeroinvest, as assignee, ADP and VASA, as amended, a true and complete copy of
which is attached hereto as Annex C.

     WHEREAS, CICASA and COINSA are the joint and several obligors of the
obligations of Aeroinvest under the ARCA, as amended by this Amendment and as
may be further amended or supplemented from time to time.

     WHEREAS, SETA wishes to acknowledge and agree to the transactions
contemplated by this Amendment and has been authorized to that effect pursuant
to the Unanimous Shareholders Resolution attached hereto as Annex D.

     WHEREAS, in a proposed transaction (the "West LB Existing Loan
Transaction") Aeroinvest has agreed to advance funds to SETA to repay the
outstanding principal amount owing to West LB AG New York Branch under the
Amended and Restated Senior Secured Credit Agreement, dated as of December 19,
2002 (the "Existing West LB Loan Agreement"), among SETA, WestLB AG, ADP, VASA
and COINSA, which outstanding principal amount as of the date hereof is
US$11,907,000, pursuant to a Loan Agreement between Aeroinvest as lender and
SETA as borrower in the form attached hereto as Annex E (the "Aeroinvest
Unsecured Loan Agreement").

     WHEREAS, WestLB AG has given its written consent to the VASA Transaction,
the COINSA/Aeroinvest Transaction, the NAFIN Transaction, the WestLB Existing
Loan Transaction and to the transactions contemplated in this Amendment, a true
and correct copy of which is attached hereto as Annex F.

     WHEREAS, in connection with the VASA Transaction, the COINSA/Aeroinvest
Transaction, the NAFIN transaction and the WestLB Existing Loan Transaction, the
parties hereto have determined that It is in their mutual interest to amend the
terms of the ARCA on the same terms and subject to the conditions set forth
herein.

     NOW THEREFORE, in consideration of the foregoing premises, the parties
hereto each hereby consents to the following:

                                    AGREEMENT

     SECTION 1. CAPITALIZED TERMS. Capitalized terms used but not otherwise
defined herein shall have the meanings specified in the ARCA, as amended and
supplemented by this Amendment.

     SECTION 2. CONDITIONAL AMENDMENTS. The NAFIN Transaction shall not take
place prior to the purchase by Aeroinvest of all the shares directly or
indirectly held by VASA in

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SETA. The following amendments to the ARCA shall become effective, without the
need of any further action by the parties hereto, only upon the completion of
the purchase or other acquisition, directly or indirectly, by COINSA, Aeroinvest
or any Related Party of COINSA or Aeroinvest of all the shares directly or
indirectly held by VASA in SETA or any interest or voting or other rights
attached to such shares:

          2.1. All references to the terms "VASA" and "VINCI" throughout the
     ARCA shall be deleted, and VASA shall cease to be a Party to the ARCA and
     from and after the completion of the VASA Transaction VASA and VINCI shall
     be released from their respective obligations under the ARCA and the
     Transaction Documents. Notwithstanding the preceding sentence, the parties
     hereto agree that (a) VASA and VINCI shall retain any obligations, duties
     and liabilities of any type and nature whatsoever accrued or arising under
     or pursuant to the ARCA or, the Transaction Documents in respect of events
     occurring prior to the completion of the VASA Transaction and (b) VASA and
     VINCI shall remain bound by the provisions of Clause XII of the ARCA for a
     term of five years following the date of this Amendment.

          2.2. The term "Parties" as used in the ARCA is hereby amended to mean
     collectively ADP and AEROINVEST.

          2.3. The following terms as used in the ARCA are hereby amended as
     follows:

          2.3.1. The term "Deadlock" as follows;

          "Deadlock" shall mean the event of an unresolved matter or
          impossibility to reach a resolution (i) at the Board of SETA with
          respect to a Major Decision, under the provisions and percentage of
          affirmative vote required under Clause 3.2.4. hereof or (ii) at the
          Shareholders Meeting of SETA in respect of the matters listed in
          Clause 3.1.4 (a), (d) or (e) or (iii) at the Shareholders Meeting of
          SETA when the unanimous consent is required, in each case for lack of
          quorum on a second call, or for lack of the required affirmative votes
          to validly resolve such matter or reach such resolution in such Board
          or Shareholders Meeting as the case may be, held in first or
          subsequent call."

          2.3.2. The term "Interest" or "Shares" as follows:

          "lnterest" or "Shares" shall mean, as the case may be, a capital
          interest participation in the outstanding and fully paid issued
          capital stock of the Strategic Partner, as well as any loans which the
          shareholders of the Strategic Partner may have granted or may grant to
          the latter, whether in Mexican Pesos, legal tender of the United
          Mexican States, or any other legal tender different therefrom, but
          expressly excluding any participation in the Secured Credit Agreement
          or any substitution or refinancing thereof and excluding the loan
          given by Aeroinvest to SETA in the principal amount of US$11,007,000
          dollars to repay the Secured Credit Agreement pursuant to an unsecured
          loan agreement between Aeroinvest as lender and SETA as borrower (the
          "Aeroinvest Unsecured Loan.").

          2.3.3. The term "Representatives" by deleting the following words:

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               "c) VASA: Renaud de Matharel or his replacement as VASA may
                    solely decide from time to time."

          2.4. Clause 3.1.3 of the ARCA is hereby amended to read as follows:

          "3.1.3 Quorum & Voting Rules

               A quorum for the SETA Shareholders' Meeting installed in first or
               subsequent call shall exist where 90% of the issued Shares of
               SETA are present either physically or by proxy. However, a quorum
               of 100% of the issued Shares of SETA shall always be required for
               the Shareholder Meetings where decision regarding Clauses 3.1.5
               (c), (e), (g), (j) and (m) are to be taken. In case of non
               attendance of a Nominee due to unforeseeable reasons beyond his
               reasonable control, the meeting shall be rescheduled for the
               following week (but at least 4 Business Days later) at the
               earliest, unless otherwise agreed by all the Nominees.

               If the required quorum is not achieved in first call, a second or
               subsequent call will be issued for such meeting, in the
               understanding that there shall be at least ten natural days
               between the date of the meeting in which the quorum was not
               achieved and the date of the subsequent meeting.

               The resolutions in the ordinary and extraordinary shareholders
               meetings in first or subsequent call will be considered legally
               adopted when favorable vote of 90% of the capital stock is
               obtained, except for resolutions in respect of the matters listed
               in Clauses 3.1.5 (c), (e), (1), (g), (1) and (m) where the
               favorable vote of 100% of the capital stock shall be required.

               Each shareholder shall have the same number of votes as the
               number of Shares held by it in the capital stock of SETA."

          2.5. The second paragraph of Clause 3.1.4 and paragraph (e) thereof
     are hereby amended to read as follows:

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          "3.1.4 Ordinary Meetings

               _________________________________________________________________

               The following decisions shall require the affirmative vote of at
               least a 90% interest of the shareholders in the Strategic
               Partner:

               (a) _____________________________________________________________

               (b) _____________________________________________________________

               (c) _____________________________________________________________

               (d) _____________________________________________________________

               (e) approval of the dividend policy of GCN before it is proposed
               by the Operating Committee of GCN to the Board of GCN for
               approval or before it is proposed by the Board of GCN to the
               shareholders' meeting of GCN for approval, and any interpretation
               or application of such dividend policy; and

               (f) _____________________________________________________________

          2.6. Paragraph (a) of Clause 3.1.5 of the ARCA is hereby deleted and
     replaced with the words "Omitted".

          2.7. Paragraphs (a) and (d) of Clause 3.1.5 of the ARCA are hereby
     deleted and replaced with the following paragraphs:

               "(c) pledge or create any other security interest in any Shares
                    held in the Strategic Partner or pledge, create any other
                    security interest, sale or otherwise transfer any shares or
                    other shareholding interest held directly or indirectly by
                    the Strategic Partner or by AEROINVEST in GCN;

               (d)  resolution of a Deadlock in respect of matters not requiring
                    unanimous consent. In such circumstances, the prior written
                    notice referred to in Clause 3.1.1(c) shall be reduced to
                    one week;

          2.8. Paragraph (f) of Clause 3.1.5 of the ARCA is hereby deleted and
     replaced with the following paragraph:

               "(f) amend or terminate the by-laws of the Holding Company, or
                    the Participation Agreement, or the Shareholders Agreement
                    dated June 14 2000, or the Shareholders Agreement between
                    Aeroinvest and SETA regarding the governance of GCN, as
                    direct or indirect shareholders of GCN, or the Technical
                    Assistance and Technology Transfer Agreement or the Option
                    Agreement or the Operation Agreement;"

          2.9. The last paragraph of Clause 3.1.5 of the ARCA is hereby amended
     to read as follows:

               "Decisions regarding Clause 3.1.5 (c),(e), (f), (g), (j) and (m)
               shall be made by unanimous consent. Except for such decisions and
               as

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               otherwise provided in Clause 3.1.5 (d), all other decisions
               regarding Clauses 3.1.4 and 3.1.5 shall require a super majority
               approval of 90% of voting shares."

          2.10. The second paragraph of Clause 3.2.2 of the ARCA is hereby
     amended to read as follows:

          "3.2.2 Members

               _________________________________________________________________

               The Chairman of the Board shall be a Director designated by
               AEROINVEST. The Chairman shall not have a tie-breaking vote.

               _________________________________________________________________

          2.11. The second paragraph of Clause 3.2.3 of the ARCA is hereby
     amended to read as follows:

          "3.2.3 Members

               Quorum & Voting Rules

               _________________________________________________________________

               The quorum for a second or subsequent Board meeting shall exist
               where 4 (four) of the Directors or their corresponding alternates
               are present, subject to Clause 3.2.4 hereof, where 6 (six) of the
               Directors or their corresponding attendees shall be required to
               be present to constitute legal quorum.
               _________________________________________________________________
               _________________________________________________________________
               _________________________________________________________________
               _________________________________________________________________
               _________________________________________________________________
               _________________________________________________________________
               _________________________________________________________________
               _________________________________________________________________

          2.12. The first paragraph of Clause 3.2.6 of the ARCA is hereby
     amended to read as follows:

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          "3.2.6 Attendance and Reporting of the Executive Committee of GCN

               The four Officers member of the Executive Committee of GCN shall
               attend each SETA Board meeting to jointly report to the Board on
               the activity of GCN since the last Board of SETA meeting or on
               any other matter which they deem important to report to the Board
               (each Officer acting individually in this latter respect). The
               structure and contents of the activity reports shall be decided
               by Simple Majority vote of the Board.
               _________________________________________________________________

          2.13. Clause 3.2.8 of the ARCA is hereby amended by amending paragraph
     (a) and adding a new paragraph (c) to read as follows:

               (a)  within three (3) Business Days of the occurrence of such
                    Deadlock, the Parties shall refer the matter subject of the
                    Deadlock to their respective Representatives, who shall meet
                    and use their best endeavors to resolve the Deadlock within
                    five (5) Business Days following such referral, and if the
                    Deadlock is resolved by the Representatives, such
                    Representatives shall vote at the Shareholders Meeting or
                    instruct their respective Directors in the Strategic Partner
                    to vote at the Board, as agreed by the Representatives;

               (b)  ____________________________________________________________

               (c)  if a Deadlock arises in connection with the matters listed
                    in paragraphs (a,) (d) or (e) of Clause 3.1.4 hereof and the
                    Representatives are unable to resolve the Deadlock pursuant
                    to paragraph (a) of this Clause 3.2.8, instead of convening
                    an Extraordinary SETA Shareholder Meeting as provided in (b)
                    above, the Parties agree to refer the matters subject of
                    such Deadlock, within ten (10) Business Days following the
                    referral of such Deadlock to the Representatives as provided
                    in (a) above, to the binding resolution of an independent
                    Mexican accounting firm (other than SETA's or GCN's external
                    auditors) member of a global accounting firm with
                    international recognition (such accounting firm to be chosen
                    by AEROINVEST out of two Mexican accounting firms proposed
                    by ADP) (the "Independent Expert"). The Independent Expert
                    shall decide in written resolution to be issued within 30
                    (thirty) calendar days following such appointment the
                    specific matters subject of such Deadlock by strictly
                    applying Mexican Generally Accepted Accounting Principles
                    ("Mexican GAAP"), and the terms of the engagement of the
                    Independent Expert shall require that such resolution be
                    issued by the Independent Expert within such period of 30
                    (thirty) calendar days. The Parties agree to be bound by the
                    terms of the resolution issued by the Independent Expert and
                    agree to reflect the resolution of the Independent Expert in
                    the financial statements of SETA or GCN, as the case may be,
                    and to approve such financial statements with all required
                    corporate formalities within 30 (thirty) calendar days
                    following the resolution of the Independent Expert. The
                    costs incurred in connection with the engagement of the

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               Independent Expert shall be borne equally by AEROINVEST and
               ADP."

          2.14. The definition of "Prepayment Parties" set forth in page 18
     paragraph (ii) of Clause 3.2.9 of the ARCA is hereby amended to read as
     follows:

               "(ii) Parties holding in the aggregate more than 90% of the
               Consortium interest (the "Prepayment
               Parties")________________________________________________________

          2.15. Subject to Section 2.1 of this Amendment, paragraph (b) of
     Clause 3.2.12 of the ARCA is hereby deleted and replaced with the words
     "Omitted".

          2.16. Paragraph (b) of Clause 4.1.1 of the ARCA is hereby amended to
     read as follows:

               "(b) AEROINVEST shall designate (2) two members and their
                    corresponding alternates."

          2.17. Paragraph (c) of Clause 4.1.1 of the ARCA and the last paragraph
     of Clause 4.1.1 of the ARCA are amended to read as follows:

               "(c) in the event that the Board of GCN is comprised by eleven
                    Directors, the eleventh Director shall be an independent
                    director to be designated by AEROINVEST, which must meet the
                    criteria in order to be considered to be an independent
                    member of the board pursuant to the US Sarbanes-Oxley Act of
                    2002.

          The Parties hereby agree that the directors of the board of GCN
          appointed by SETA shall not be Officers of GCN. The Parties further
          agree that at least three of such directors shall be Directors of the
          Board of SETA."

          2.18. Clause 4.1.2 of the ARCA is hereby amended by deleting the last
     two paragraphs.

          2.19. Clause 4.1.3 of the ARCA is hereby amended to read as follows:

          "4.1.3. The three Directors of GCN directly or indirectly appointed by
               SETA and all other Directors of GCN appointed directly or
               indirectly by AEROINVEST shall vote (including use of veto) at
               the board of GCN in strict compliance with the decisions made by
               the Shareholders or the Board of SETA to the extent the item on
               the agenda of the GCN board meeting falls within the powers of
               the Shareholders or the Board of SETA, as the case may be. For
               all other items (including use of veto), the three Directors of
               GCN appointed directly or indirectly by SETA and all other
               Directors of GCN appointed directly or indirectly by AEROINVEST,
               shall consult each other and decide on a common position before
               expressing their views on the board of GCN and before proceeding
               to any vote (including use of veto). In the event they are unable
               to reach a common

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               position, they will attempt to delay the decision on the board of
               GCN in order to obtain instructions from the shareholders of
               SETA,"

          2.20. Paragraphs (b) and (c) of Clause 4.2.1 of the ARCA are hereby
     amended to read as follows:

               "(b) the Chief Financial & Administration Manager of GCN shall be
                    appointed by AEROINVEST with the prior approval of ADP which
                    may not be unreasonably withheld, and

               "(c) As long as ADP continues to be a shareholder of SETA and the
                    Airport Operator (as the term "Socio Operador Aeroportuario"
                    is defined in the Participation Agreement), the Chief
                    Operations & Commercial Development Manager of GCN shall be
                    appointed by ADP, with the prior approval of AEROINVEST,
                    which may not be unreasonably withheld."

          2.21. Clause 4.2.2 of the ARCA Is hereby amended to read as follows:

          "4.2.2 The following three managers of GCN shall be appointed as
     follows:

               (a)  As long as ADP continues to be a shareholder of SETA and the
                    Airport Operator (as the term "Socio Operador Aeroportuario"
                    is defined in the Participation Agreement), the Chief Safety
                    & Quality Control Manager shall be appointed by ADP, with
                    the prior approval of AEROINVEST, which may not be
                    unreasonably withheld,

               (b)  the Chief Human Resources Manager shall be appointed by
                    AEROINVEST with the prior approval of ADP which may not be
                    unreasonably withheld, and

               (c)  the General Counsel shall be appointed by AEROINVEST with
                    the prior approval of ADP which may not be unreasonably
                    withheld.

          The Directors appointed by the Parties at the Board of GCN shall vote
          as regards such appointments in accordance with a decision taken by
          the Board of SETA in accordance with Clause 3.2.3 (a)."

          2.22. Paragraphs (b) and (d) of Clause 4.2.4 of the ARCA are hereby
     amended to read as follows:

               "(b) the managers of GCN appointed according to Clauses 4.2.1,
                    4.2,2 and 4.2.3 shall be Officers. Each Party shall use its
                    best efforts to maintain as much as possible the principle
                    of specialization in designating GCN's Officers;

               (c)  ____________________________________________________________

               (d)  at the written request of any Party, any Officer shall be
                    dismissed if such

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                    request is acknowledged as valid by the other Party. Any
                    such Officer so dismissed shall be replaced in accordance
                    with this Clause 4.2;"

          2.23. Clause 4.3.1 of the ARCA is hereby amended to read as follows:

          "4.3.1 Frequency and Notices

               The Executive Committee will meet at any location and as often as
               necessary. The members of the Executive Committee shall use their
               best efforts to work as a team and, therefore shall meet
               informally when necessary. However, the Committee shall meet upon
               request, whether written or oral of one of the members and the
               other three members shall use their best efforts to accommodate
               their agenda in order to allow the Committee meeting to be held
               as soon as possible, but in any event not later than within 5
               (five) Business Days following the date of the request."

          2.24. Clause 4.3.2 of the ARCA is hereby amended to read as follows:

          "4.3.2. Members

               (a)  The Executive Committee shall consist of the three Officers
                    appointed by the shareholders of SETA in accordance with
                    Clause 4.2.1 plus the Chief Safety & Quality Control Manager
                    appointed in accordance with Clause 4.2.2 (a).

               (b)  The chairman of the Executive Committee shall be the General
                    Director of GCN. The chairman of the Executive Committee
                    shall not have a casting vote."

          2.25. Paragraphs (a), (d) and (e) of Clause 4.3.3 of the ARCA are
     hereby amended to read as follows:

          "4.3.3 Quorum and Voting rules

               (a)  The Executive Committee will hold meetings only if all four
                    members are able to attend physically. Presence by proxy
                    shall not be permitted,

               (b)  ____________________________________________________________

               (c)  ____________________________________________________________

               (d)  However, should a disagreement arise on a matter discussed
                    during a meeting of the Executive Committee, a vote among
                    the four members shall take place. The decision to resolve
                    such matter shall be a decision approved by at least three
                    of the four Officers member of the Executive Committee. In
                    addition, the General Director will have the right to veto a
                    decision proposed by the three other Officers of the
                    Committee.

               (e)  If a decision to resolve a matter of disagreement cannot be
                    made such that it is supported by at least three of the four
                    Officers of the Committee (notwithstanding any veto of the
                    General Director), then such matter of

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                    disagreement will be referred to the Board of SETA who shall
                    proceed as follows:

                    i. _________________________________________________________

                    ii. ________________________________________________________

                    iii. _______________________________________________________

          2.26. Paragraph (c) and the second to last paragraph of Clause 4.3.6
     of the ARCA are hereby amended to read as follows:

          4.3.6 Powers of the Executive Committee

               _________________________________________________________________

               (a)  The Executive Committee will hold meetings only if all four
                    members are able to attend physically. Presence by proxy
                    shall not be permitted,

               (b) _____________________________________________________________

               (c) _____________________________________________________________

               (d)  recommend the policy related to the bank accounts of GCN or
                    the payments on behalf of GCN, it being understood that
                    signing powers should be delegated on the principle of
                    double signature, where the signature of the Chief Financial
                    Officer & Administrative Manager (or an employee of the
                    treasury department of GCN to whom his powers have been
                    delegated) will always be required. Further, any debit in
                    excess of:

               i.   US$6,000 for an airport with traffic below 0.5 million PAX
                    in the year preceding the year in which the debit is made
                    and for any expenses of the Holding Company or the Service
                    Company,

               ii.  US$15,000 for an airport with traffic comprised between 0.5
                    million and 1 million PAX in the year preceding the year in
                    which the debit is made,

               iii. US$30,000 for an airport with traffic comprised between 1
                    million and 3 million PAX in the year preceding the year
                    when the debit is made,

               iv.  US$60,000 for an airport with traffic above 3 million PAX in
                    the year preceding the year in which the debit is made,

                    shall require the sign-off of a member of the Executive
                    Committee appointed by ADP as long as ADP maintains a
                    shareholding participation in SETA of more than 10% of the
                    capital stock of SETA."

               (d) _____________________________________________________________

               (e) _____________________________________________________________

               (f) _____________________________________________________________

               (g) _____________________________________________________________

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               In the event the four members of the Executive Committee are
               unable to agree on a course of action, the provisions under
               Clause 4.3.3(d) and (e) hereof shall apply.
               _________________________________________________________________

          2.27. Clause 4.4.2 is hereby deleted and replaced with the following:

          "4.4.2 The Audit Committee of GCN shall be comprised by three (3)
               members. AEROINVEST shall have the right to appoint two members,
               one of which must meet the criteria in order to be considered to
               be an independent member pursuant to the US Sarbanes-Oxley Act of
               2002, and ADP shall have the right to appoint the third member."

          2.28. Paragraphs (b), (c) and (d) of Clause 7.1.4 of the ARCA are
     hereby amended to read as follows:

          "(b) Any one or more of the other SETA Shareholders shall thereupon be
               entitled to purchase the Offered Shares or nominate one or more
               proposed purchases of the Offered Shares, in each case on the
               same terms and conditions as specified in the Sale Notice,
               provided that, if more than one SETA Shareholder proposes to
               exercise this right and such SETA Shareholders together wish to
               purchase or nominate purchasers for a number of Shares in excess
               of the number of Offered Shares, the Offered Shares shall be
               allotted among such SETA Shareholders and/or proposed purchasers
               pro rata to the respective shareholdings of the SETA
               Shareholders;

          (c)  Not later than eight (8) Business Days following receipt of the
               copy of the Sale Notice, the SETA Shareholder, willing to
               exercise their preemption right or their right to nominate one or
               more proposed purchasers shall notify such willingness in writing
               to the Chairman of the Board of SETA;

          (d)  At the end of the period referred to in paragraph (c) above, the
               Board of SETA shall forthwith inform the Seller in writing of the
               following:

               i.   the identity of the SETA Shareholders willing to exercise
                    their preemption right or their right to nominate one or
                    more proposed purchasers, as the case may be, together with
                    the identity of the proposed purchasers so nominated,

               ii.  the number of Offered Shares which each SETA Shareholder
                    and/or proposed purchaser so nominated wishes to purchase,

               iii. the period for completion of the sale, which shall not
                    exceed forty Business Days after the date of the receipt of
                    the Sale Notice subject to any governmental notification or
                    approval; provided. however, that if the Seller is ADP and
                    the SETA Shareholders

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<PAGE>

                    willing to exercise their preemption right and/or the
                    proposed purchasers so nominated do not complete the
                    purchase of the Offered Shares in the terms set forth in the
                    Sale Notice within such forty (40) Business Days period for
                    any reason whatsoever (other than, with respect to a failure
                    to complete the sale of Offered Shares that are subject to
                    minimum holding requirements pursuant to Section 2.4.1 of
                    the Participation Agreement, the lack of any SCT approval
                    required in connection with such sale by ADP), ADP shall be
                    entitled to sell or transfer all of the Offered Shares
                    without any restrictions and the Transfer Restrictions,
                    Preemption Rights and Extended Transfer Restrictions set
                    forth in Clauses 7.1.1, 7.1.3, 7.1.4 and 7.1.5 of this
                    Agreement shall not apply to any such sale or transfer by
                    ADP or any future sale or transfer by ADP of the Offered
                    Shares which is consummated within one hundred and twenty
                    (120) Business Days following the date of the Sale Notice on
                    substantially the terms contained in such Sale Notice."

          2.29. A new paragraph 7.3 is added to Clause VII to read as follows:,

          "7.3 ADP's Transfer Rights.

               At the request of ADP, the Parties agree to cause SETA to issue
               multiple certificates of Shares representing ADP's interest in
               SETA in exchange for or in lieu of other certificates of Shares
               representing ADP's interest in SETA to facilitate any partial
               sale or transfer. Notwithstanding anything contained to the
               contrary in this Agreement, the Transfer Restrictions, Preemption
               Rights and Extended Transfer Restrictions set forth in Clauses
               7.1.1, 71.3, 7.1.4 and 7.1.5 of this Agreement shall not apply to
               any exercise by ADP of a Tag-Along Right or a Put Option."

          2.30. A new paragraph 7.4 is added to Clause VII to read as follows:

          7.4 ADP Tag-Alone Right

          7.4.1 For so long as ADP continues to own any Shares, if AEROINVEST or
               any successor or assignee thereof (in each case, a "Selling
               Shareholder") proposes to sell or otherwise transfer, directly or
               indirectly, any of its Shares to any non-Related Party (the
               "Purchaser"), in a single transaction or series of related
               transactions, then ADP shall have the right (the "Tag-Along
               Right"), exercisable as set forth in Clause 7.4.3, to (i) sell or
               transfer to the Purchaser, upon the same terms (including but not
               limited to the amount and type of consideration paid at the date
               of closing for each Share that is the subject of the relevant
               sale or transfer) and subject to the same conditions (including
               providing such representations and warranties as may be
               reasonably required by the Purchaser with

                                       13

<PAGE>

               respect to the relevant shares owned by ADP) as the Selling
               Shareholder, that number of Shares to be sold in the proposed
               transaction free and clear of any security interest, lien,
               encumbrance, injunction or garnishment (rounded up to the nearest
               whole number of shares) equal to the aggregate number of Shares
               owned, in the aggregate, beneficially by ADP multiplied by a
               fraction, the numerator of which is the number of Shares to be
               sold by the Selling Shareholder and the denominator of which is
               the total number of Shares owned beneficially by the Selling
               Shareholder and any Related Party; provided, however, that a
               Tag-Along Right with respect to Shares owned by ADP subject to
               minimum holding requirements pursuant to Section 2.4.1 of the
               Participation Agreement may only be exercised following the
               expiration of the 15 Year Waiting Period set forth in Section
               2.4.1 of the Participation Agreement or before, if the 51%
               minimum shareholding participation requirement for the Key
               Partners and the 10% minimum shareholding participation
               requirement for the Operating Partner are removed, waived by the
               SCT or otherwise no longer applicable, and (ii) sell or transfer
               to the Purchaser the same percentage, based on the number of
               Shares to be transferred or sold by ADP, of then outstanding
               loans granted and capital contributions made by ADP to the
               Strategic Partner. The Selling Shareholder shall, to the extent
               necessary, reduce the number of Shares that it is seeking to sell
               to allow for the appropriate Shares of ADP to be sold in such
               proposed transaction.

          7.4.2 The Selling Shareholder shall give written notice (the
               "Tag-Along Notice") to ADP of each proposed sale or transfer by
               it of Shares which gives rise to the rights of ADP set forth in
               Clause 7.4.1, at least twenty (20) days prior to the proposed
               consummation of such sale, setting forth (i) the identity of the
               Purchaser and of its immediate shareholders or partners, (ii) the
               consideration per Share to be paid in the subject sale or
               transfer (including a copy of the underlying agreement, if any,
               with the Purchaser), (iii) the proposed closing date for such
               transaction and (iv) the other material terms and conditions of
               such transaction.

          7.4.3 The Tag-Along Right may be exercised by ADP, by delivering a
               written notice (the "Tag-Along Exercise Notice") to the Selling
               Shareholder, within fifteen (15) days (the "Tag-Along Exercise
               Period") following the delivery of the Tag-Along Notice. The
               Tag-Along Exercise Notice shall indicate the wish of ADP to
               exercise its Tag-Along Right and specify the number of Shares (up
               to the maximum number of Shares required to be purchased by the
               Purchaser) and the amount of outstanding loans granted and
               capital contributions made by ADP to the Strategic Partner that
               it wishes to sell or transfer in the proposed transaction, and
               the Selling Shareholder shall be obligated to include (and the
               Purchaser obligated to purchase) such number of Shares and amount
               of outstanding loans and capital contributions as part of the
               proposed transaction. ADP and the Selling Shareholder shall
               thereafter take all action, as may reasonably be

                                       14

<PAGE>

               requested in order to facilitate the closing of the applicable
               transaction and to effectuate the provisions of this Clause 7.4
               (including the execution and delivery of the relevant purchase
               agreements and other instruments for the consummation of the
               proposed transaction) within a period not to exceed 90 days.

          7.4.4 If ADP does not timely deliver its Tag-Along Exercise Notice or
               elects not to exercise its Tag-Along Right, the Selling
               Shareholder shall have one hundred and twenty (120) calendar days
               following the expiration of the Tag-Along Exercise Period in
               which to consummate the proposed transaction on substantially the
               terms contained in the Tag-Along Notice, subject to Clause 7.1.4.
               Promptly after the consummation of any such transaction, the
               Selling Shareholder shall notify ADP of the consummation thereof.
               If the Selling Shareholder does not complete the transaction
               within the 120-calendar-day period specified in this Clause 7.4.4
               or if the terms of the proposed transaction differ in any
               material respect from those described in the Tag-Along Notice,
               the Selling Shareholder may not engage in such transaction
               without repeating the procedures in this Clause 7.4.

          7.4.5 If subsequent to the consummation of any transaction in respect
               of which ADP elected to exercise its Tag-Along Right, the Selling
               Shareholder or any Related Party of the Selling Shareholder
               receives any additional consideration in respect of such
               transaction, directly or indirectly, from the Purchaser or from a
               Related Party of the Purchaser or from any person directed by the
               Purchaser, the Seller shall be obligated to share such additional
               consideration with ADP, taking into account the number of Shares
               transferred by each of them respectively."

          2.31. A new paragraph 7.5 is added to Clause VII to read as follows:

          "7.5 Put Option

          7.5.1 The Put Option

               In consideration of ADP agreeing to enter into this Amendment,
               each of AEROINVEST, CICASA and COINSA (collectively the "Put
               Option Obligors") hereby grants to ADP an option to require any
               one or more of the Put Option Obligors, all of which shall be
               jointly and severally obligated, to purchase in one or more
               transactions (i) all of the Shares owned by ADP in excess of 10%
               of the outstanding capital stock of SETA (the "Unrestricted Put
               Option Shares"), (ii) following the expiration of the 15 Year
               Waiting Period set forth in Section 2.4.1 of the Participation
               Agreement or before, if the 51% minimum shareholding
               participation requirement for the Key Partners and the 10%
               minimum shareholding participation requirement for the

                                       15

<PAGE>

               Operating Partner are removed, waived by the SCT or otherwise no
               longer applicable, all of the Shares owned by ADP representing
               the remaining 10% of the outstanding capital stock of SETA (the
               "Restricted Put Option Shares"), and (iii) all or a portion of
               the then outstanding loans granted, and contributions for future
               capital increases made, by ADP to the Strategic Partner (the "ADP
               Put Option Shareholder Loans"), on the terms of this Clause 7.5
               (each a "Put Option")(provided that the Put Option Obligors may
               allocate among themselves, at their sole discretion, the number
               of Unrestricted Put Option Shares, Restricted Put Option Shares
               and ADP Put Option Shareholder Loans to be purchased by each Put
               Option Obligor).

          7.5.2 Exercise

               A Put Option may be exercised by ADP during the period commencing
               on June 14, 2009 and ending on the later to occur of (i) June 14,
               2015 or (ii) six months following the expiration or other valid
               termination of the Technical Assistance and Technology Transfer
               Agreement in respect of the Project (the "Put Option Period"),
               and thereafter shall lapse.

               A Put Option may be exercised by ADP by delivering a written
               notice (a "Put Option Notice") specifying whether the Put Option
               relates to the Unrestricted Put Option Shares and/or the
               Restricted Put Option Shares and/or ADP Put Option Shareholder
               Loans which are to be the subject of the relevant Put Option and
               the corresponding Put Option Price (as defined below) upon any
               one or more of the Put Option Obligors, whereupon ADP shall sell
               and the Put Option Obligors shall purchase such Unrestricted Put
               Option Shares and/or Restricted Put Option Shares, and ADP Put
               Option Shareholder Loans, as the case may be.

               ADP may exercise one or more Put Options during the Put Option
               Period. Each Put Option shall expire at the end of the last day
               of the Put Option Period.

          7.5.3 Put Option Completion

               Each sale and purchase of Unrestricted Put Option Shares and/or
               Restricted Put Option Shares and ADP Put Option Shareholder Loans
               shall be completed at the registered office of SETA or at such
               other place as ADP and the Put Option Obligors may agree, within
               thirty days following the delivery of the Put Option Notice,
               whereupon ADP shall deliver to the Put Option Obligors duly
               executed transfers in respect of the relevant Unrestricted Put
               Option Shares and/or Restricted Put Option Shares, as the case

                                       16

<PAGE>

               may be, and ADP Put Option Shareholder Loans, together with the
               relative certificates against payment of the corresponding Put
               Option Price by the Put Option Obligors, with the Put Option
               Price becoming payable (i) in full in US Dollars in same day
               funds on completion by wire transfer of funds to such bank
               account as ADP shall notify in a written notice to the Put Option
               Obligors or (ii) at the option of ADP, in GCN shares (valued by
               reference to the price per GCN share at the closing of the
               Mexican stock exchange on the date of the relevant Put Option
               Notice) provided that the shares of GCN are listed on the Mexican
               stock exchange on completion and that such payment in GCN shares
               does not dilute the direct or indirect holdings of the Put Option
               Obligors and their Related Parties in GCN below 51% of the
               outstanding capital stock of GCN (unless such dilution takes
               place prior to the date of the relevant Put Option Notice).

          7.5.4 Put Option Price

               For purposes of this Clause 7.5:

               (a)  The Put Option Price for the Unrestricted Put Option Shares
                    means the highest of:

                    (i) the value of the Technical Assistance and Technology
                    Transfer Agreement for the Project, calculated as the sum of
                    future Management Fees equal to 5% of GCN EBITDA as per
                    Schedule I attached hereto, discounted at a rate of 10.75%
                    plus the value of SETA's interest in GCN based on GCN equity
                    valued at the price per share in U.S. Dollars payable in
                    connection with the exercise of the 36% Option (less
                    dividends paid by GCN from the date of exercise of the 36%
                    Option up to an amount of US$140 million) pursuant to
                    Section 3.4.1 of the Participation Agreement, indexed at a
                    rate per annum equal to 5%, minus the Net Debt of SETA and

                    (ii) the average between (x) the value of the Technical
                    Assistance and Technology Transfer Agreement, calculated as
                    described in (i) above, plus the value of SETA's interest in
                    GCN equity on the basis of the most recent twelve months
                    EBITDA of GCN multiplied by 9 times (minus GCN Net Debt),
                    minus the Net Debt of SETA, and (y) the valuation provided
                    by an internationally recognized investment bank through the
                    delivery of a fairness opinion (such investment bank to be
                    chosen by the Put Option Obligors out of two investment
                    banks proposed by ADP, with the costs incurred in connection
                    with the engagement of such investment bank to be borne
                    50/50 between the Put Option Obligors on the one hand and
                    ADP on the other hand).

                                       17

<PAGE>

                    For purposes of this Agreement the term "EBITDA" shall mean,
                    for any period, (a) total operating regulated and non
                    regulated income for such period minus (b) operating costs
                    (including cost of sales, administrative costs, Management
                    Fees) for such period, in each case taking into account the
                    adjustment amount (actualization) applied to income and
                    costs in accordance with Mexican GAAP.

                    For purposes of this Agreement the term "Net Debt" shall
                    mean, as to any Person, (i) the aggregate amount of total
                    Indebtedness minus, (ii) the amount of total cash on hand
                    and marketable securities, in each case of such Person at
                    such date determined in accordance with Mexican GAAP.

                    For purposes of the definition of Net Debt, the term
                    "Indebtedness" shall mean, as to any Person, without
                    duplication, (a) all indebtedness of such Person for
                    borrowed money or for the deferred purchase price of
                    property or services (other than current trade liabilities
                    incurred In the ordinary course of business and payable in
                    accordance with customary practices) and (b) any other
                    indebtedness of such Person which is evidenced by a note,
                    bond, debenture or similar instrument.

               (b)  The Put Option Price per Restricted Put Option Share, if
                    sold together with the Unrestricted Put Option Shares, shall
                    be the same price per Unrestricted Put Option Share
                    calculated in accordance with paragraph (a) above.

               (c)  The Put Option Price per Restricted Put Option Share, if not
                    sold together with the Unrestricted Put Option Shares, shall
                    be the same price in U.S. Dollars per Unrestricted Put
                    Option Share calculated in accordance with paragraph (a)
                    above, indexed at a rate per annum equal to 5% from the date
                    of payment of the Put Option Price for the Unrestricted Put
                    Option Shares until the date of payment of the Put Option
                    Price for the Restricted Put Option Shares.

               (d)  The Put Option Price for the ADP Put Option Shareholder
                    Loans shall be the outstanding principal amount of such ADP
                    Put Option Shareholder Loans plus any accrued but unpaid
                    interest up to and including the date of payment of such Put
                    Option Price.

               (e)  The Put Option Price per Unrestricted Put Option Share and
                    per Restricted Put Option Share shall be adjusted to take
                    into account any stock splits, reverse stock splits,
                    reclassification of shares, capital increases and similar
                    actions.

                                       18

<PAGE>

          7.5.5 Other Terms

               Upon exercise of a Put Option with respect to Unrestricted Option
               Shares and/or Restricted Option Shares, as the case may be, ADP
               shall sell such Option Shares with full title guarantee, free
               from security interests created by ADP or any other injunction,
               encumbrance or garnishment and with all rights and obligations
               then or subsequently attaching to them, but otherwise without any
               representation or warranty, and ADP shall execute and deliver
               other documents and take other steps at the reasonable request of
               the Put Option Obligors following the relevant completion where
               this is required to vest such Option Shares in the Put Option
               Obligors and otherwise to give it the full benefit of this
               clause."

          2.32. A new paragraph 7.6 is added to Clause VII to read as follows:

          "7.6 Call Option

          7.6.1 The Call Option

               In consideration of AEROINVEST agreeing to enter into this
               Amendment, ADP hereby grants to AEROINVEST an option to require
               ADP to sell to AEROINVEST (i) all of the Shares owned by ADP in
               excess of 10% of the outstanding capital stock of SETA (the
               "Unrestricted Call Option Shares"), (ii) following the expiration
               of the 15 Year Waiting Period set forth in Section 2.4.1 of the
               Participation Agreement or before, if the 51% minimum
               shareholding participation requirement for the Key Partners and
               the 10% minimum shareholding participation requirement for the
               Operating Partner are removed, waived by the SCT or otherwise no
               longer applicable, all of the Shares owned by ADP representing
               the remaining 10% of the outstanding capital stock of SETA (the
               "Restricted Call Option Shares"), and (iii) all of the then
               outstanding loans granted, and contributions for future capital
               increases made, by ADP to the Strategic Partner (the "ADP Call
               Option Shareholder Loans"), on the terms of this Clause 7.6 (the
               "Call Option").

          7.6.2. Exercise

               The Call Option may be exercised by AEROINVEST during the period
               commencing on June 14, 2009 and ending on the later to occur of
               (i) June 14, 2015 or (ii) six months following the expiration or
               other valid termination of the Technical Assistance and
               Technology Transfer Agreement in respect of the Project (the
               ("Call Option Period") and thereafter shall lapse; provided that
               in any event the Call Option may only be exercised in case of a

                                       19

<PAGE>

               Deadlock that the Parties are unable to resolve, acting in good
               faith, pursuant to Clause 3.2.8 of this Agreement.

               If the Call Option is exercised during the 15 Year Waiting Period
               set forth in Section 2.4.1 of the Participation Agreement and the
               51% minimum shareholding participation requirement for the Key
               Partners and the 10% minimum shareholding participation
               requirement for the Operating Partner are still in effect,
               AEROINVEST may exercise the Call Option during the Call Option
               Period in case of a Deadlock that the Parties are unable to
               resolve, acting in good faith, pursuant to Clause 3.2.8 of this
               Agreement, in one transaction purchasing from ADP all of the
               Unrestricted Call Option Shares and the ADP Call Option
               Shareholder Loans, and in a subsequent second transaction
               purchasing from ADP all of the Restricted Call Option Shares
               following the expiration of the 15 Year Waiting Period set forth
               in Section 2.4.1 of the Participation Agreement or before, if the
               51% minimum shareholding participation requirement for the Key
               Partners and the 10% minimum shareholding participation
               requirement for the Operating Partner are removed, waived by the
               SCT or otherwise no longer applicable.

               If the Call Option is exercised following the expiration of the
               15 Year Waiting Period set forth in Section 2.4.1 of the
               Participation Agreement or before, if the 51% minimum
               shareholding participation requirement for the Key Partners and
               the 10% minimum shareholding participation requirement for the
               Operating Partner are removed, waived by the SCT or otherwise no
               longer applicable, AEROINVEST may only exercise the Call Option
               during the Call Option Period in case of a Deadlock that the
               Parties are unable to resolve, acting in good faith, pursuant to
               Clause 3.2.8 of this Agreement, in one transaction purchasing
               from ADP all of the Unrestricted Call Option Shares, the
               Restricted Call Option Shares and the ADP Call Option Shareholder
               Loans.

               The Call Option may be exercised by AEROINVEST by delivering a
               written notice (a "Call Option Notice") specifying whether the
               Call Option relates to the Unrestricted Call Option Shares and/or
               the Restricted Call Option Shares and/or ADP Call Option
               Shareholder Loans which are to be the subject of the Call Option
               and the corresponding Call Option Price (as defined below),
               whereupon ADP shall sell and AEROINVEST shall purchase such
               Unrestricted Call Option Shares and/or Restricted Call Option
               Shares, and ADP Call Option Shareholder Loans, as the case may
               be.

                                       20

<PAGE>

               AEROINVEST may exercise a Call Option during the continuation of
               a Deadlock that the Parties are unable to resolve, acting in good
               faith, pursuant to Clause 3.2.8 of this Agreement. The Call
               Option shall expire at the end of the last day of the Call Option
               Period.

          7.6.3 Call Option Completion

               The sale and purchase of Unrestricted Call Option Shares and/or
               Restricted Call Option Shares and ADP Call Option Shareholder
               Loans pursuant to the exercise of the Call Option shall be
               completed at the registered office of SETA or at such other place
               as ADP and AEROINVEST may agree, within thirty days following the
               delivery of the Call Option Notice, whereupon ADP shall deliver
               to AEROINVEST duty executed transfers in respect of the relevant
               Unrestricted Call Option Shares and/or Restricted Call Option
               Shares, as the case may be, and ADP Call Option Shareholder
               Loans, together with the relative certificates against payment of
               the corresponding Call Option Price by AEROINVEST with the Call
               Option Price becoming payable in full in US Dollars in same day
               funds on completion by wire transfer of funds to such bank
               account as ADP shall notify in a written notice to AEROINVEST.

          7.6.4 Call Option Price

               For purposes of this Clause 7.6:

               (a)  The Call Option Price for the Unrestricted Call Option
                    Shares means the highest of:

                    (i) the value of the Technical Assistance and Technology
                    Transfer Agreement for the Project, calculated as the sum of
                    future Management Fees equal to 5% of GCN EBITDA as per
                    Schedule I attached hereto, discounted at a rate of 10.75%
                    plus the value of SETA's interest in GCN based on GCN equity
                    valued at the price per share in U.S. Dollars payable in
                    connection with the exercise of the 36% Option (less
                    dividends paid by GCN from the date of exercise of the 36%
                    Option up to an amount of US$140 million) pursuant to
                    Section 3.4.1 of the Participation Agreement, indexed at a
                    rate per annum equal to 5%, minus the Net Debt of SETA and

                    (ii) the average between (x) the value of the Technical
                    Assistance and Technology Transfer Agreement, calculated as
                    described in (i) above, plus the value of SETA's interest in
                    GCN equity based on the basis of the most recent twelve
                    months EBITDA of GCN multiplied by 9 times (minus GCN Net
                    Debt), minus the Net Debt

                                       21

<PAGE>

                    of SETA, and (y) the valuation provided by an
                    internationally recognized investment bank through the
                    delivery of a fairness opinion (such investment bank to be
                    chosen by AEROINVEST out of two investment banks proposed by
                    ADP, with the costs incurred in connection with the
                    engagement of such investment bank to be borne equally by
                    AEROINVEST and ADP).

               (b)  The Call Option Price per Restricted Call Option Share, if
                    sold together with the Unrestricted Call Option Shares,
                    shall be the same price per Unrestricted Call Option Share
                    calculated in accordance with paragraph (a) above.

               (c)  The Call Option Price per Restricted Call Option Share, if
                    not sold together with the Unrestricted Call Option Shares,
                    shall be the same price per Unrestricted Call Option Share
                    calculated in accordance with paragraph (a) above, indexed
                    at a rate per annum equal to 5% from the date of payment of
                    the Call Option Price for the Unrestricted Call Option
                    Shares until the date of payment of the Call Option Price
                    for the Restricted Call Option Shares.

               (d)  The Call Option Price for the ADP Call Option Shareholder
                    Loans shall be the outstanding principal amount of such ADP
                    Call Option Shareholder Loans plus any accrued but unpaid
                    interest up to and including the date of payment of such
                    Call Option Price.

               (e)  The Call Option Price per Unrestricted Call Option Share and
                    per Restricted Call Option Share shall be adjusted to take
                    into account any stock splits, reverse stock splits,
                    reclassification of shares, capital increases and similar
                    actions.

          7.6.5 Other Terms

               Upon exercise of the Call Option with respect to Unrestricted
               Call Option Shares and/or Restricted Call Option Shares, as the
               case may be, ADP shall sell such Call Option Shares with full
               title guarantee, free from security Interests created by ADP or
               any other injunction, encumbrance or garnishment and with all
               rights and obligations then or subsequently attaching to them,
               but otherwise without any representation or warranty, and ADP
               shall execute and deliver other documents and take other steps at
               the reasonable request of AEROINVEST following the relevant
               completion where this is required to vest such Call Option Shares
               in AEROINVEST and otherwise to give it the full benefit of this
               clause."

                                       22

<PAGE>

          2.33. The second paragraph of Clause 9.3 of the ARCA is hereby amended
     to read as follows:

               "The remaining part of the Management Fee will be shared between
               the Parties according to their interest in the Strategic Partner,
               after the deduction of an amount payable to ADP in the month of
               December of every calendar year, commencing on December 2005,
               equal to the highest of

               (i)  8% of the yearly incremental EBITDA of GCN when comparing
                    EBITDA of GCN as of November 30 on the year prior to the
                    year when the calculation is made against EBITDA as of
                    November 30 on the year of calculation, and

               (ii) US$150,000 dollars,

               which amount payable to ADP (a) shall be payable for as long as
               ADP continues to be the Airport Operator (as the term "Socio
               Operador Aeroportuario" is defined In the Participation
               Agreement) and (b) shall be pari passu in priority and payment to
               the Secured Credit Agreement but senior In priority and payment
               to any other contractual obligation of the Strategic Partner
               which is not mandatory preferred by operation of law."

          2.34. Paragraph (a) of Clause 10.1 of the ARCA is hereby deleted and
     replaced with the words "Omitted".

          2.35. Subject to Section 2.1, paragraph (e) of Clause 10.1 of the ARCA
     is hereby deleted and replaced with the words "Omitted".

     SECTION 3. RATIFICATION OF OTHER TERMS. All other terms and conditions of
the ARCA which are not specifically amended by this Amendment shall remain
unchanged and are hereby ratified by the parties hereto and shall continue to be
in full force and effect.

     SECTION 4. MISCELLANEOUS PROVISIONS. The provisions of Clause XIII of the
ARCA (other than Clauses 13.13 and 13.17 which are not applicable to this
Amendment) shall apply to this Amendment and are incorporated herein by
reference mutatis mutandis.

     SECTION 5. EFFECT OF AMENDMENT. In the event of any conflict between the
provisions of this Amendment and either the ARCA or any other agreement executed
prior to the date hereof, the provisions of this Amendment shall prevail over
the provisions of the ARCA, and the specific provisions of this Amendment shall
prevail over any general provisions in other agreements relating to the same
subject matter except if such specific provisions would breach applicable law or
any provision of any of the Transaction Documents.

     SECTION 6. SPECIFIC AMENDMENTS TO SETA'S BY-LAWS. The Shareholders of SETA
hereby agree to further implement the terms of this Amendment by taking the
necessary

                                       23

<PAGE>

corporate actions to reflect and give effect on the date hereof to the specific
amendments to the by-laws of SETA set forth in Annex_G hereto.

     SECTION 7. INDEMNITY. Each of Aeroinvest, CICASA and COINSA agrees to
indemnify and hold harmless each of ADP and its Related Parties, and their
respective officers, directors, employees, agents and advisors, including,
without limitation, the members and alternate members of the SETA Board of
Directors appointed by ADP, lawyers, accountants, consultants, bankers,
financiers and any of such advisors' representatives (each an "Indemnified
Party") from and against any and all claims, damages, losses, liabilities and
expenses (including without limitation reasonable fees and expenses of counsel)
that may be incurred by or asserted or awarded against any Indemnified Party, in
each case arising out of or in connection with or by reason of (including,
without limitation, in connection with any investigation, litigation or
proceedings or preparation of defense in connection therewith) this Amendment,
the VASA Transaction, the NAFIN Transaction, the COINSA/Aeroinvest Transaction,
the WestLB Existing Loan Transaction or any of the transactions contemplated
herein or therein. In the case of an Investigation, litigation or other
proceeding to which the Indemnity hereunder applies, such Indemnity shall be
effective whether or not such investigation, litigation or proceeding is brought
by the directors, equityholders or creditors of an Indemnified Party or by any
other person, whether or not any Indemnified Party is otherwise a party thereto
and whether or not the VASA Transaction, the NAFIN Transaction, the
COINSA/Aeroinvest Transaction, the WestLB Existing Loan Transaction or the
transactions contemplated hereby are consummated.

     SECTION 8. ADMINISTRATION TRUST. To establish a mechanism to ensure
performance of the obligations of the Put Option Obligors under Clause 7.5 of
the ARCA, Aeroinvest hereby irrevocably agrees to transfer, upon completion of
the VASA Transaction and the COINSA/Aeroinvest Transaction, Shares representing
33.5% of the capital stock of SETA to an Administration Trust created pursuant
to an Administration Trust Agreement in the form attached hereto as Annex H;
provided that the creation of the Administration Trust and the establishment of
the mechanism contemplated therein does not constitute payment of, and shall not
be construed to constitute a release of the Put Option Obligors performance of,
their respective obligations as set forth in Clause 7.5 of the ARCA.

     SECTION 9. VOTING OF 36% OPTION SHARES. Aeroinvest agrees to vote all of
the shares representing capital stock of GACN purchased by Aeroinvest in
connection with the NAFIN Transaction (collectively the "36% Option Shares") (or
cause all such shares to be voted) in all shareholder meetings of GACN always as
a block in the same manner as SETA decides to vote the shares it holds directly
or indirectly in GACN; provided, however, that if ADP maintains a shareholding
participation in SETA of 10% or less of the capital stock of SETA, Aeroinvest
shall be required to vote the 36% Option Shares (or cause all such shares to be
voted) in all shareholder meetings of GACN as a block in the same manner as SETA
decides to vote the shares it holds directly or indirectly in GACN but only to
the extent the item on the agenda of the GACN shareholders meeting falls within
the matters set forth in Clause 3.1.5 (c), (e), (f), (g), (j) or (m) of the ARCA
as amended by this Amendment, and provided, further, that before voting the 36%
Option Shares in any shareholder meeting of GACN to approve any dividend
payment, reduction or reimbursement of capital, amortization of shares or
delivery of liquidation quotas or other distributions, in each case payable by
GACN in kind, Aeroinvest shall obtain the prior

                                       24

<PAGE>

written consent and instruction of West LB AG New York Branch, as Beneficiary in
First Place in the Guaranty Trust Agreement (as defined below).

Each of the parties hereto acknowledges and agrees that all of the 36% Option
Shares will be contributed by Aeroinvest, concurrently with the purchase
thereof, into an irrevocable guaranty and source of payment trust created
pursuant to an irrevocable guaranty and source of payment trust agreement (the
"Guaranty Trust Agreement") with GE Capital Bank, S.A., Institucion de Banca
Multiple, GE Capital Grupo Financiero as trustee (the "Guaranty Trust Trustee")
(i) to secure a bank financing to be obtained by Aeroinvest to complete the
NAFIN Transaction, (ii) to ensure that in all circumstances all of the 36%
Option Shares are always voted in all shareholder meetings of GACN by the
Guaranty Trust Trustee as a block in the manner described in this Section 9 and
(iii) to ensure that upon expiration or termination of the Guaranty Trust
Agreement for reasons other than (a) a foreclosure of the security created
therein and the sale of the 36% Option Shares to a third party which is not a
Related Party of Aeroinvest, (b) a public offering of the 36% Option Shares, or
(c) a transfer of the 36% Option Shares to an irrevocable trust where the
trustee thereof is required to vote the 36% Option Shares in the same manner as
the majority of the capital stock of GACN decides to vote, pursuant to paragraph
B of Clause Eighth of the Guaranty Trust Agreement, following the fifth
anniversary of the Guaranty Trust Agreement when Aeroinvest elects not to sell
through a public offering the 36% Option Shares for the pricing considerations
set forth in such paragraph B, the 36% Option Shares (and any other shares
representing capital stock of GACN then forming part of the assets of the trust
created pursuant to the Guaranty Trust Agreement) shall be reverted indirectly
to Aeroinvest, as settlor and beneficiary in second place in the Guaranty Trust
Agreement, or sold to the third party purchaser thereof that is a Related Party
of Aeroinvest, as the case may be, by having the Guaranty Trust Trustee transfer
all such shares to a Mexican bank acting as trustee of a trust to be established
with Aeroinvest or such related third party purchaser, as the case may be, as
beneficiary, which trust shall provide the same voting arrangements in respect
of all such shares as those set forth in the Guaranty Trust Agreement and the
Irrevocable Mandate Agreement referred to below, the terms and conditions of
which shall be in form and substance satisfactory to ADP.

Aeroinvest agrees to fully implement and reflect in the Guaranty Trust
Agreement, concurrently with the purchase of the 36% Option Shares, the
provisions set forth in this Section to the satisfaction of ADP. Furthermore,
ADP's consent to the NAFIN Transaction is subject to the condition that
Aeroinvest and the Guaranty Trust Trustee shall have executed concurrently with
the purchase of the 36% Option Shares and the execution of the Guaranty Trust
Agreement an Irrevocable Mandate Agreement in the form attached hereto as Annex
I.

Aeroinvest acknowledges and agrees that a breach of the agreements contained
herein would constitute a breach of a material obligation assumed for the
benefit of ADP that would cause irreparable harm to ADP and that monetary
damages would not be sufficient to compensate ADP for such a breach.

     SECTION 10. PURCHASE OF ADDITIONAL SHARES AT GCN. Except for a 36% interest
in GACN to be purchased by Aeroinvest in connection with the NAFIN Transaction,
each of Aeroinvest, COINSA and CICASA agrees not to purchase or otherwise
acquire, directly or indirectly, (whether by purchase, exchange, issuance of
capital stock, merger, reorganization or

                                       25

<PAGE>

any other method) any shares or other interest in GACN or in any of GCN's
Subsidiaries, without prior consultation with, and adequate opportunity to
comment being Afforded to, ADP.

     SECTION 11. GACN SHAREHOLDERS AGREEMENT. Each of SETA and Aeroinvest agrees
to enter on the date hereof into a shareholders agreement, in the form attached
hereto as Annex J, to establish the rules regarding the governance of GACN.

     SECTION 12. REPAYMENT OF THE EXISTING WESTLB LOAN AGREEMENT. Each of SETA
and Aeroinvest agrees to enter into the Aeroinvest Unsecured Loan Agreement, the
form of which is attached hereto as Annex E, to cause SETA to repay the Existing
WestLB Loan.

                                       26

<PAGE>

     IN WITNESS WHEREOF, each party hereto has cause this Amendment No.1 to the
Amended and Restated Consortium Agreement to be executed by its authorized
representative as of this 13 day of December 2005.

AEROPORTS DE PARIS                      AEROINVEST, S.A. DE C.V.

By          [illegible]                By               [illegible]
   ----------------------------------        -----------------------------------
Name:       [illegible]                Name:            [illegible]
      -------------------------------         ----------------------------------
Title:      [illegible]                Title:           [illegible]
       ------------------------------         ----------------------------------

VINCI AIRPORTS, S.A.S.

By          [illegible]
   ----------------------------------
Name:       [illegible]
      -------------------------------
Title:      [illegible]
       ------------------------------

                                       27

<PAGE>

ACCEPTED AND AGREED AS OF THIS 13
DAY OF DECEMBER 2005

VINCI, S.A.

By             [illegible]
    ---------------------------------
Name:          [illegible]
      -------------------------------
Title:         [illegible]
       ------------------------------

ACCEPTED AND AGREED AS OF THIS __ DAY
OF DECEMBER 2005

CONSTRUCTORAS ICA, S.A. DE C.V.

By             [illegible]
   ----------------------------------
Name:          [illegible]
      -------------------------------
Title:         [illegible]
       ------------------------------

ACCEPTED AND AGREED AS OF THIS __ DAY
OF DECEMBER 2005

CONTROLADORA DE OPERACIONES DE
INFRAESTRUCTURA, S.A. DE C.V.

By             [illegible]
   ----------------------------------
Name:          [illegible]
      -------------------------------
Title:         [illegible]
       ------------------------------

ACCEPTED AND AGREED AS OF THIS __ DAY
OF DECEMBER 2005

SERVICIOS DE TECNOLOGIA
AEROPORTUARIA, S.A. DE C.V.

By             [illegible]
   ----------------------------------
Name:          [illegible]
      -------------------------------
Title:         [illegible]
       ------------------------------

                                       28

<PAGE>

Continuation of Signature Page to
Amendment No. 1 to Amended and Restated
Consortium Agreement.

ACCEPTED AND AGREED AS OF THIS __ DAY
OF DECEMBER 2005

VINCI, S.A.

By             [illegible]
   ----------------------------------
Name:          [illegible]
      -------------------------------
Title:         [illegible]
       ------------------------------

ACCEPTED AND AGREED AS OF THIS 13 DAY
OF DECEMBER 2005

CONSTRUCTORAS ICA, S.A. DE C.V.

By             [illegible]
   ----------------------------------
Name:          [illegible]
      -------------------------------
Title:         [illegible]
       ------------------------------

ACCEPTED AND AGREED AS OF THIS 13 DAY
OF DECEMBER 2005

CONTROLADORA DE OPERACIONES DE
INFRAESTRUCTURA, S.A. DE C.V.

By             [illegible]
   ----------------------------------
Name:          [illegible]
      -------------------------------
Title:         [illegible]
       ------------------------------

ACCEPTED AND AGREED AS OF THIS 13 DAY
OF DECEMBER 2005

SERVICIOS DE TECNOLOGIA
AEROPORTUARIA, S.A. DE C.V.

By             [illegible]
   ----------------------------------
Name:          [illegible]
      -------------------------------
Title:         [illegible]
       ------------------------------

                                       29EX-10.1

 

Exhibit 10.1

MERCK & CO., INC. SEPARATION BENEFITS PLAN

FOR NONUNION EMPLOYEES

Amended and Restated Effective as of July 11, 2006

Revised
July 6, 2006

 

 

MERCK & CO., INC.

SEPARATION BENEFITS PLAN FOR NONUNION EMPLOYEES

Amended and Restated Effective as of July 11, 2006

SECTION I

PURPOSE

The purpose of this Merck & Co., Inc. Separation Benefits Plan for Nonunion Employees (the “Plan”)
is to provide benefits to eligible nonunion employees whose employment with the Company is
terminated at the initiative of the Company for reasons described below. This Plan is part of the
Merck & Co., Inc. Separation Allowance Plan (Plan No. 514).

SECTION 2

DEFINITIONS

For the purposes of this Plan, the following terms shall have the following meanings:

2.1 “Annual Base Salary” means the Covered Employee’s annualized base salary according to
the Company’s payroll records in effect as of the date the Covered Employee incurs a
Separation From Service, without reduction for any pre-tax contributions to
Company-sponsored benefit plans. Annual Base Salary does not include bonuses, commissions,
overtime pay, shift pay, premium pay, cost of living allowances, income from stock options
or other incentives under a Company Incentive Stock Plan, stock grants or other incentives,
or other pay not specifically included above.

2.2 “Basic Life Insurance” means the employee group term life insurance
coverage in effect for a Covered Employee on the date he/she incurs a Separation From
Service as follows:

	 	(a)	 	if on that date the Covered Employee has “New Format”
coverage (as described in the applicable Merck life insurance plan as it may
be amended from time to time): the amount equal to the lesser of his/her
employee group term life coverage or 1x base pay; or
	 
	 	(b)	 	if on that date the Covered Employee has “Old Format”
coverage (as described in the applicable Merck life insurance plan as it may
be amended from time to time): the amount equal to 2x base pay.

2.3 “Casual Employee” means a person who may be called by the Company at any time for
employment in the U.S. on a non-scheduled and non-recurring

1

 

basis, and who becomes an employee of the Company only after reporting to work for the
period of time during which the person is working, and who is not covered by a collective
bargaining agreement.

2.4 “Change in Control” shall have the meaning set forth in the CIC Plan (and, for
avoidance of doubt, a valid amendment of that definition under the CIC Plan shall
constitute an amendment of this Plan without further action).

2.5 “CIC Plan” means the Merck & Co., Inc. Change in Control Separation Benefits Plan.

2.6 “Claims Reviewer” means the Vice President, Human Resources, most directly responsible
for the Company’s employee benefit plans or his or her delegate; provided however, for
Section 16 Officers, Claims Reviewer means the Compensation and Benefits Committee of the
Board of Directors of Merck or its delegate.

2.7 “Company” means Merck and any other employer listed on Schedule A hereto.

2.8 “Complete Year of Continuous Service” means a year from the Covered Employee’s Most
Recent Hire Date to its anniversary, and thereafter from each anniversary to the next.

2.9 “Continuous Service” means the period of a Covered Employee’s continuous employment
with the Company commencing on the Covered Employee’s Most Recent Hire Date and ending on
the Separation Date as reflected on the Company’s employee database.

2.10 “Covered Employee” means an Eligible Employee who has experienced a Separation From
Service and who has signed – and not revoked – a Release of Claims in a form that is
satisfactory to the Company in its sole and absolute discretion.

2.11 “Effective Date” means July 11, 2006 with respect to Eligible Employees who incur a
Separation From Service on or after such date.

2.12 “Eligible Employee” means an employee of the Company who:

	 	(a)	 	is (i) a Regular Full-Time Nonunion Employee or Regular
Part-Time Nonunion Employee, exempt or non-exempt, on the Company’s normal
U.S. payroll, or (ii) a U.S. Expatriate on the Company’s normal U.S. payroll;
and
	 
	 	(b)	 	is not otherwise excluded under this paragraph. “Eligible
Employee” excludes a person who is:

	 	1.	 	a Temporary Employee;

2

 

	 	2.	 	an employee covered by collective bargaining
agreement between the Company and a labor organization;
	 
	 	3.	 	an independent contractor, or who agrees or has
agreed that he/she is an independent contractor, or has any agreement or
understanding with the Company, or any of its affiliates that he/she is
not an employee or an Eligible Employee, even if he/she previously had
been an employee or an Eligible Employee or is employed by a temporary or
other employment agency, regardless of the amount of control, supervision
or training provided by the Company, or he/she is a “leased employee” as
defined under section 414 (n) of the Internal Revenue Code of 1986, as
amended. Such an excluded person is not eligible to participate in the
Plan even if a court, agency or other authority rules that he/she is a
common-law employee of the Company;
	 
	 	4.	 	an employee of the Company classified by the Company
as an intern, graduate or cooperative student associate;
	 
	 	5.	 	a Casual Employee;
	 
	 	6.	 	entitled, upon termination of employment with the
Company to separation, severance, termination or other similar payments
under another plan or program sponsored by the Company or pursuant to a
separate agreement with the Company that provides for payments or benefits
in connection with the termination of the employee’s employment (or
provides that no payment or benefits are due to the employee in connection
with his/her termination of employment) unless such plan, program or
separate agreement expressly provides for benefits under this Plan;
	 
	 	7.	 	is a party to an employment agreement with the
Company, unless the employment agreement expressly provides that the
employee is eligible to participate in this Plan;
	 
	 	8.	 	is on an unapproved leave of absence;
	 
	 	9.	 	is on an approved leave of absence, other than the
following leaves of absence:

	 	•	 	short term disability leave of less than 6 months
	 
	 	•	 	family medical leave
	 
	 	•	 	educational leave approved for less than 6 months
	 
	 	•	 	personal leave approved for less than 6 months
	 
	 	•	 	personal leave for jury duty
	 
	 	•	 	military leave; or

3

 

	 	10.	 	is a participant in the CIC Plan (but this clause 10
shall only apply during the Protection Period (as defined in Section 6.8)).

2.13 “Employee Benefits Committee” means the committee established by Merck to review
claims and appeals under certain employee benefit plans sponsored by Merck; provided,
however, for Section 16 Officers, Employee Benefits Committee means the Compensation and
Benefits Committee of the Board of Directors of Merck or its delegate.

2.14 “ERISA” means the Employee Retirement Income Security Act of 1974, as amended, and the
regulations promulgated thereunder.

2.15 “Merck” means Merck & Co., Inc.

2.16 “Most Recent Hire Date” means an Eligible Employee’s most recent hire date as
reflected on the Company’s employee data system.

2.17 “Notice Period” means a period of time, as determined by the Company, in which an
Eligible Employee may be notified of his or her Separation From Service as described in
Section 4.1.

2.18 “Pay in Lieu of Notice” means pay in lieu of advance notice of a Separation From
Service as described in Section 4.1.

2.19 “Plan” means the Merck & Co., Inc. Separation Benefits Plan for Nonunion Employees as
set forth herein, and as may be amended from time to time.

2.20 “Regular Full-Time Nonunion Employee” means an employee employed by the Company in the
U.S. on a scheduled basis for a normal work week, who is not classified as part-time,
temporary (whether paid by the Company or through an agency) or Casual, is not covered by a
collective bargaining agreement or unit, and is not an employee of a non-U.S. subsidiary of
Merck.

2.21 “Regular Part-Time Nonunion Employee” means an employee employed by the Company in the
U.S. who works on a scheduled basis of less than the number of regularly scheduled hours
for his or her site who is not classified as full-time, temporary (whether paid by the
Company or through an agency) or Casual, who is not covered by a collective bargaining
agreement or unit, and is not an employee of a non-U.S. subsidiary of Merck.

2.22 “Release of Claims” means the agreement that a Covered Employee must
execute in order to receive Separation Plan Benefits, which shall be prepared by the
Company and shall contain such terms and conditions as determined by the Company, including
but not limited to a general release of claims, known or

4

 

unknown, that the Covered Employee may have against the Company and any of its subsidiaries
and/or affiliates, including claims related to the employment and termination of employment
of the Covered Employee; such Release of Claims may also contain, in the Company’s
discretion, non-solicitation and non-competition provisions.

2.23 “Section 16 Officer” means an “officer” as such term is defined in Rule 16(a)-1(f) of
the Securities Exchange Act of 1934.

2.24 “Separation Benefits” means the outplacement benefits provided pursuant to Section 4.3
and the continued medical, dental and Basic Life Insurance benefits provided pursuant to
Section 4.4.

2.25 “Separation Date” means an Eligible Employee’s last day of employment with the Company
due to a Separation From Service.

2.26 “Separation Pay” means the cash benefit payable under this Plan pursuant to Section
4.2.

2.27 “Separation From Service” means the termination of an Eligible Employee’s employment
by the Company

	 	(a)	 	as the result of:

1. organizational changes (including discontinuance of operations,
location closings or corporate restructuring); or

2. a reduction in workforce;

	 	(b)	 	but not as the result of:

1. an Eligible Employee’s voluntary termination of employment;

2. an Eligible Employee’s retirement from employment with the Company,
including disability retirement; provided, however an Eligible Employee
whose employment is to be terminated due to a Separation From Service and
who elects to retire under a retirement plan of the Company on a date
agreed to by the Company shall be eligible under this Plan for Pay in Lieu
of Notice, Separation Pay and, subject to the provisions of Section 4.4,
Separation Benefits;

3. formation of a joint venture or other
entity in which
the Company directly or indirectly owns or will own some outstanding
voting or other ownership interest where the Eligible Employee is offered
any employment with the joint venture or other entity at a work location
that is less than 50 miles farther (as

5

 

determined in accordance with the Company’s relocation policy) from the
Eligible Employee’s residence at the time of the formation or transfer to
such entity than the work location immediately prior to the formation or
transfer to such entity or where the Eligible Employee continues
employment with the joint venture or other entity at any work location.
Employment with the joint venture or other entity does not have to be
similar in type, status, pay or benefits to the Eligible Employee’s
employment with the Company;

4. divestiture of a subsidiary, division or other identifiable segment of
the Company where the Eligible Employee is offered any employment with the
acquiring entity at a work location that is less than 50 miles farther (as
determined in accordance with the Company’s relocation policy) from the
Eligible Employee’s residence at the time of the divestiture than the work
location immediately prior to the divestiture or where the Eligible
Employee continues employment with the acquiring entity at any work
location. Employment with the acquiring entity does not have to be
similar in type, status, pay or benefits to the Eligible Employee’s
employment with the Company;

5. transfer of an Eligible Employee’s job to a work location that is less
than 50 miles farther (as determined in accordance with the company’s
relocation policy) from the Eligible Employee’s residence than the work
location immediately prior to the transfer of such job;

6. an Eligible Employee’s refusal to accept a transfer to a position (for
which the Eligible Employee is qualified by reason of knowledge, training
and experience) at the same or higher grade level at a work location that
is less than 50 miles farther (as determined in accordance with the
company’s relocation policy) from the Eligible Employee’s residence than
the work location immediately prior to the proposed transfer;

7. the death of an Eligible Employee;

8. termination of employment due to the Eligible Employee’s failure to
return to work for any reason, including but not limited to expiration of
an authorized leave of absence; or

9. an Eligible Employee who has been identified for Separation From
Service who terminates employment with the Company prior to the date such
Separation From Service was to occur unless the Company expressly and in
writing agrees to waive this provision.

6

 

2.28 “Separation Pay Period” means the period beginning on the date the
Covered Employee incurs a Separation From Service during which Separation Pay described on
Schedule B is payable in periodic installments in accordance with the Company’s normal
payroll periods. Payment of Separation Pay in a lump sum under the Plan does not shorten
the Separation Pay Period.

2.29 “Separation Plan Benefits” means Separation Pay described in Section 4.2 and
Separation Benefits described in Sections 4.3 and 4.4.

2.30 “Temporary Employee” means an employee hired and paid by the Company for a specific
position in the U.S. for a designated length of time, which is normally not more than 24
consecutive months in duration, who is committed to leave the Company at the end of that
time and is not covered by a collective bargaining agreement or unit.

2.31 “U.S. Expatriate” means a U.S. citizen or individual with U.S. Permanent Resident
status who is employed by a foreign subsidiary of Merck, as a foreign service employee.

SECTION 3

ELIGIBILITY FOR BENEFITS

	 	(a)	 	An Eligible Employee will be eligible for Separation Plan Benefits and Pay in
Lieu of Notice described in Section 4 when he/she experiences a Separation From
Service. Pay in Lieu of Notice shall be paid regardless of an Eligible Employee’s
execution of a Release of Claims. However, Separation Pay and Separation Benefits
shall be provided under this Plan only if the Eligible Employee has executed and not
revoked a Release of Claims in a form satisfactory to the Company in its sole and
nonreviewable discretion. An Eligible Employee who has executed and not revoked a
Release of Claims is a Covered Employee.
	 
	 	(b)	 	An Eligible Employee will also be entitled to receive those pension benefits
set forth in Schedule E (Change in Control/Pension) and retiree healthcare and life
insurance benefits set forth in Schedule F (change in Control/Retiree Healthcare and
Life Insurance) if (i) a Change in Control has occurred and (ii) within two years
thereafter, the Eligible Employee’s employment with the Company is terminated by the
Company without Cause and other than for death or Permanent Disability. The Company
may, to the extent it deems necessary or appropriate (including to comply with
applicable law), (1) cause the benefits set forth in Schedule E to be paid from the
Company’s Supplemental Retirement Plan (the “Supplemental Plan”) or otherwise from the
Company’s general assets and (2) cause the benefits set forth in Schedule F to be
provided from an insured arrangement, pursuant to individual arrangements or
otherwise. For purposes of this Section 3(b), the terms “Cause” and “Permanent
Disability” shall have the meanings set forth in the

7

 

	 	 	 	CIC Plan (and, for the avoidance of doubt, a valid amendment of these definitions under
the CIC Plan shall constitute an amendment of this Plan without further action).

SECTION 4

BENEFITS

4.1 Notice Period and Pay in Lieu of Notice

	 	(a)	 	Each Eligible Employee who will experience a Separation From
Service may be given notice before, at the beginning of or during the Notice
Period as set forth in Schedule C to this Plan. The terms of Schedule C are
hereby fully incorporated into and shall be considered as part of Section 4 of
this Plan. In the event that the Company determines that an Eligible
Employee’s last day of work shall be prior to the end of the Notice Period as
set forth in Schedule C, such Eligible Employee shall be entitled to Pay in
Lieu of Notice for the balance of such Notice Period.
	 
	 	(b)	 	Pay in Lieu of Notice shall be in addition to, and shall not
be reduced by nor reduce any Separation Pay the Covered Employee may be
entitled to receive under Section 4.2.
	 
	 	(c)	 	If the Company is required by operation of Section 5 of the
Worker Adjustment Retraining and Notification Act or any other similar
federal, state or local law to give notice or provide payment to an Eligible
Employee or a Covered Employee for reasons giving rise to entitlement to
notice or Pay in Lieu of Notice under this Plan, such statutory notice or
payments shall be in lieu of, and not in addition to, notice or Pay in Lieu of
Notice under this Plan.

4.2 Separation Pay — Separation Pay shall be payable under this Plan as set forth on
Schedule B-1 to a Covered Employee whose Separation From Service occurs on or after
November 1, 2005 but before January 1, 2009. Separation Pay shall be payable under this
Plan as set forth on Schedule B-2 to a Covered Employee whose Separation From Service
occurs before November 1, 2005 or after December 31, 2008. The terms of such Schedule B-1
and Schedule B-2 are hereby fully incorporated into and shall be considered as part of
Section 4 of this Plan. In no event shall the Separation Pay under the Plan exceed 200%
of a Covered Employee’s Annual Base Salary.

4.3
Outplacement Benefits — Benefits for outplacement counseling or other outplacement
services, as set forth in Schedule D will be made available to a Covered Employee. The
terms of such Schedule D are hereby fully incorporated into and shall be considered as part
of Section 4 of this Plan. Outplacement benefits shall be provided in kind; cash shall not
be paid in lieu of outplacement

8

 

benefits nor will Separation Pay be increased if a Covered Employee declines or does not
use the outplacement benefits.

4.4 Medical, Dental and Basic Life Insurance Benefits

	 	(a)	 	A Covered Employee shall continue medical, dental and Basic
Life Insurance coverage during the Separation Pay Period. If the Separation
Pay Period is less than 6 months, the medical, dental and Basic Life Insurance
coverage described in this Section 4.4 shall continue for the 6-month period
beginning on the first day of the month coincident with or following the date
the Covered Employee incurs a Separation From Service.
	 
	 	(b)	 	The medical and dental and Basic Life insurance coverages
that shall be continued under this Section 4.4 are those coverages that are in
effect for the Covered Employee as of the date the Covered Employee incurs a
Separation From Service, subject to and in accordance with the terms of the
applicable medical, dental and life insurance plans as they may be amended
from time to time. A Covered Employee who, prior to the Separation From
Service, had elected no medical or dental coverage under the Company’s medical
or dental plans will not be permitted to change from no medical and/or dental
coverage to coverage as a result of a Separation From Service. The Covered
Employee who continues medical and dental coverage may change such coverages
(e.g., coverage option and family status) subject to the terms and conditions
of the applicable plans as they apply to active employees.
	 
	 	(c)	 	These Separation Benefits shall begin on the first day of the
month coincident with or following the date the Covered Employee incurs a
Separation From Service. The medical, dental and Basic Life insurance
coverages shall end on the last day of the month in which the Separation Pay
Period ends or, if the Separation Pay Period is less than 6 months, then at
the end of the 6-month period during which medical and dental coverages are
provided.
	 
	 	(d)	 	Contributions for Separation Benefits shall be deducted from
Separation Pay in the time and manner specified by Merck from time to time.
	 
	 	(e)	 	Eligibility for COBRA continuation coverage for medical
and/or dental plan coverage shall begin at the first day of the month
following the expiration of the Separation Pay Period, or, if the Separation
Pay Period is less than 6 months, then at the end of the 6 month period during
which medical and dental coverages are provided. The Covered Employee will
also be eligible to continue basic life insurance coverage under the
continuation provisions of the life insurance plan,

9

 

	 	 	 	if any, and as they may be amended from time to time, for the balance of the
plan continuation period.
	 
	 	(f)	 	At the time the Release of Claims is signed, the Covered
Employee may decline to continue medical, dental and Basic Life Insurance
Separation Benefits under this paragraph; however, the Covered Employee must
decline to continue all such Separation Benefits. Such election to decline
Separation Benefits is irrevocable. Cash shall not be paid in lieu of
Separation Benefits nor will Separation Pay be increased if a Covered Employee
declines medical, dental and Basic Life Insurance coverage. If the Covered
Employee declines medical, dental and Basic Life Insurance Separation
Benefits, then he/she shall be eligible for COBRA continuation coverage for
medical and dental in accordance with the COBRA continuation provisions of the
medical and dental plans applicable to terminated employees, and continuation
of the Basic Life insurance in accordance with the continuation provisions of
the life insurance plan, if any, and as they may be amended from time to time.
If Separation Benefits are provided during the period for consideration and
revocation of the Release of Claims and, upon signing the Release of Claims,
the Covered Employee declines medical, dental and Basic Life Insurance
Separation Benefits, then contributions for the Separation Benefits provided
during the consideration and revocation periods will be deducted from the
Separation Pay.
	 
	 	(g)	 	Anything in the Plan to the contrary notwithstanding:

	 	•	 	no medical coverage shall be provided under this Plan to an Eligible
Employee or a Covered Employee who is or becomes eligible for retiree
medical benefits upon retirement in connection with a Separation From
Service;
	 
	 	•	 	no dental coverage shall be provided under this Plan to an Eligible
Employee or a Covered Employee who is or becomes eligible for retiree
dental benefits upon retirement in connection with a Separation From
Service;
	 
	 	•	 	no Basic Life Insurance coverage shall be provided under this Plan to
an Eligible Employee or a Covered Employee who is or becomes eligible for
retiree life insurance benefits following a Separation From Service; and
	 
	 	•	 	to the extent that an Eligible Employee or Covered Employee becomes
entitled to benefits pursuant to Schedule F of the Plan, no coverage shall
be provided under this Section 4.4.

10

 

4.5
Reduction of Benefits — Notwithstanding anything in this Plan to the contrary, an
Eligible Employee’s Pay in Lieu of Notice, if any, and a Covered Employee’s Pay in Lieu of
Notice, if any, and Separation Pay shall be reduced by:

	 	(a)	 	any amount the Plan Administrator reasonably concludes the
Eligible Employee or Covered Employee owes the Company including, without
limitation, unpaid bills under the corporate credit card program, and for
vacation used, but not earned; and
	 
	 	(b)	 	any severance or severance type benefits that the Company
(or any subsidiary or affiliate of the Company) must pay to a Covered Employee
under applicable law; and
	 
	 	(c)	 	where permitted by law, any payments received by the Covered
Employee pursuant to state workers compensation laws; and
	 
	 	(d)	 	short term disability benefits where state law does not
permit Pay in Lieu of Notice and/or Separation Pay to be offset from short
term disability benefits.

SECTION 5

FORM AND TIMING OF BENEFITS; FORFEITURE AND REPAYMENT OF BENEFITS

5.1
Form and Time of Payment — Separation Pay shall commence as soon as practicable after
the Covered Employee’s Separation From Service and the expiration of any period during
which the Covered Employee may revoke the Release of Claims. Separation Pay, less taxes
and applicable deductions shall be paid in periodic installments corresponding to the
Company’s normal payroll periods; provided, however, that if the Separation Pay Period is
less than 6 months, then the Company will pay the Separation Pay in a lump sum.

Pay in Lieu of Notice shall be paid in a lump sum as soon as administratively feasible
after the Covered Employee’s Separation Date.

Payments generally may not be made on account of separation from service for six months
following the termination of employment of a “Specified Employee” as defined in Prop.
Treas. Reg. Sec. 1.409A-1(i) or any successor thereto, which in general includes the top 50
employees of a company ranked by compensation. Notwithstanding anything contained in the
Plan to the contrary, if a Covered Employee is a “Specified Employee” on his or her
Separation Date, to the extent required by Section 409A of the Internal Revenue Code of
1986, as amended, no payments will be made to him or her prior to the first day of the
sixth month following termination of employment. Instead, amounts that would otherwise
have been payable will be accumulated and paid, without interest, as soon as
administratively feasible following such six-month period.

11

 

5.2
Taxes  — Separation Pay and Pay in Lieu of Notice payable under this Plan shall be
subject to the withholding of appropriate federal, state and local taxes.

Section 409A – Notwithstanding anything in this Plan to the contrary, benefits under this
Plan (including Separation Pay, Pay in Lieu of Notice and Separation Benefits) that are
subject to Section 409A of the Internal Revenue Code of 1986, as amended, will be adjusted
to avoid the excise tax under Section 409A. Merck will take any and all steps it
determines are necessary, in its sole and absolute discretion, to adjust benefits under
this Plan (including Separation Pay, Pay in Lieu of Notice and Separation Benefits) to
avoid the excise tax under Section 409A, including but not limited to, reducing or
eliminating benefits, changing the time or form of payment of benefits, etc.

5.3 Forfeiture of Benefits — The Company reserves the right, in its sole and absolute
discretion, to cancel all benefits under this Plan in the event a Covered Employee engages
in any activity that the Company considers detrimental to its interests as determined by
the Company’s Senior Vice President and General Counsel and the Senior Vice President,
Human Resources. Activities that the Company considers detrimental to its interest
include, but are not limited to:

	 	(a)	 	breach of any obligations of the Covered Employee’s Terms
and
Conditions of Employment;
	 
	 	(b)	 	making false or misleading statements about the Company or
its
products, officers or employees to competitors, customers, potential
customers of the Company or to current or former employees of the Company;
or
	 
	 	(c)	 	breaching any terms of the Release of Claims.

5.4
Cessation of Separation Pay and Separation Benefits — Separation Pay and Separation
Benefits shall cease in the event a Covered Employee is rehired by the Company or one of
its subsidiaries or affiliates.

5.5
Return of Separation Pay — If Separation Pay is paid under this Plan in a lump sum, and
an event described in 5.3 or 5.4 occurs pursuant to which Separation Benefits would cease,
then the Covered Employee shall repay to the Company that portion of the lump sum amount
that would not have been paid had the Separation Pay been paid in installments.

5.6
Death of Covered Employee — If a Covered Employee dies before the Separation Pay has
been fully paid, the balance of payments will be payable to the Covered Employee’s estate,
less contributions for continued medical and dental coverage as described below. If the
Covered Employee’s dependents were covered under the medical and dental coverages (other
than coverages applicable to retirees and their dependents) at the time of the Covered
Employee’s death, and, prior to payment of the balance of the Separation Pay, they choose
to continue to be covered under the medical and dental coverages, they will continue

12

 

to do so for the balance of the Separation Pay Period. Such coverages shall be subject to
and in accordance with the terms of the applicable plans as they may be amended from time
to time. Contributions for the medical and dental coverages will be deducted from the
balance of Separation Pay. The dependents covered at the time of the Covered Employee’s
death may change such coverages (e.g., coverage option and family status) subject to the
terms and conditions of the applicable medical and dental plans as they apply to active
employees of the Company. Any additional contributions that result from a change in family
status must be paid in order to maintain such coverage. Upon the expiration of the
continued coverage under this paragraph, those dependents who are still covered shall be
offered COBRA continuation coverage for the balance of the 36-month period beginning at the
date of the death of the Covered Employee.

SECTION 6

ADMINISTRATION, AMENDMENT AND TERMINATION

6.1 Plan Administration — Merck is the Plan Administrator for purposes of ERISA.

6.2 Powers and Duties of Plan Administrator — The Plan Administrator shall have the full
discretionary power and authority to: (i) construe and interpret the Plan (including,
without limitation, supplying omissions from, correcting deficiencies in, or resolving
inconsistencies or ambiguities in, the language of the Plan); (ii) determine all questions
of fact arising under the Plan, including questions as to eligibility for and the amount of
benefits; (iii) establish such rules and regulations (consistent with the terms of the
Plan) as it deems necessary or appropriate for administration of the Plan; (iv) delegate
responsibilities to others to assist in administering the Plan; and (v) perform all other
acts it believes reasonable and proper in connection with the administration of the Plan.
The Plan Administrator shall be entitled to rely on the records of the Company in
determining any Covered Employee’s entitlement to and the amount of benefits payable under
the Plan. Any determination of the Plan Administrator, including interpretations of the
Plan and determinations of questions of fact, shall be final and binding on all parties.

Additional Discretionary Authority — The Plan Administrator may, upon written approval of
Merck’s Senior Vice President, Human Resources (written approval of the Compensation and
Benefits Committee of the Board of Directors of Merck or its delegate with respect to
Section 16 Officers), take the following actions under the Plan:

	 	(a)	 	grant benefits under this Plan to an employee who would not
otherwise be eligible for such benefits under Section 3 above;

13

 

	 	(b)	 	waive the requirement set forth in Section 3 for any
individual Eligible Employee or group of Eligible Employees to execute a
Release of Claims;
	 
	 	(c)	 	grant additional Separation Plan Benefits to a Covered
Employee;
	 
	 	(d)	 	pay Separation Pay to a Covered Employee in a single lump
sum; and
	 
	 	(e)	 	extend the Notice Period.

6.4 Plan Year — The Plan Year shall be the calendar year.

6.5 Claims Procedures

	 	(a)	 	Any request or claim for benefits under the Plan must be
filed by a claimant or the claimant’s authorized representative within 60 days
after the date the event occurs that the claimant alleges gives rise to the
claimant’s claim (e.g., for eligibility for Separation Pay, within 60 days
after the claimant’s employment with the Company ends; for amount of
Separation Pay, within 60 days after the first payment of allegedly incorrect
Separation Pay; for forfeiture of Separation Pay under Section 5.3, within 60
days after the cessation of payment).
	 
	 	(b)	 	Any request or claim for benefits under the Plan shall be
deemed to be filed when a written request made by the claimant or the
claimant’s authorized representative addressed to the Claims Reviewer at the
address below is received by the Claims Reviewer.

Claims Reviewer for the Separation Benefits Plan

c/o Secretary of the Employee Benefits Committee

WS 3B-35

Merck & Co., Inc.

One Merck Drive, P.O. Box 100

Whitehouse Station, NJ 08889-0100

	 	 	 	The claim for benefits shall be reviewed by, and a determination shall be
made by, the Claims Reviewer, within the timeframe required for notice of
adverse benefit determinations described below.
	 
	 	(c)	 	The Claims Reviewer shall provide written or electronic
notification to the claimant or the claimant’s authorized representative of
any “adverse benefit determination.” Such notice shall be provided within a
reasonable time but not later than 90 days after the receipt by the Claims
Reviewer of the claimant’s claim, unless the Claims Reviewer determines that
special

14

 

	 	 	 	circumstances require an extension of time for processing the claim. If
the Claims Reviewer determines that an extension of time for processing is
required, written notice of the extension shall be furnished to the
claimant before the expiration of the initial 90-day period indicating the
special circumstances requiring an extension and the date by which the
Claims Reviewer expects to render the benefit determination. No extension
can exceed 90 days from the end of the initial 90-day period (i.e., 180
days from the receipt of the claim by the Claims Reviewer) without the
consent of the claimant or the claimant’s authorized representative.
	 
	 	(d)	 	An “adverse benefit determination” is a denial, reduction, or
termination of, or a failure to provide or make payment (in whole or part) for
a benefit, including one that is based on a determination of a claimant’s
eligibility to participate in the Plan.
	 
	 	(e)	 	The notice of adverse benefit determination shall be written in a manner
calculated to be understood by the claimant and shall:

	 	(i)	 	set forth the specific reasons for the adverse benefit determination;
	 
	 	(ii)	 	contain specific references to Plan provisions
on which the determination is based;
	 
	 	(iii)	 	describe any material or information
necessary for the claim for benefits to be allowed and an explanation
of why such information is necessary; and
	 
	 	(iv)	 	describe the Plan’s appeal procedures and the time limits applicable
to such procedures, including a statement of the claimant’s right to bring
a civil action under section 502(a) of ERISA following an adverse benefit
determination on review.

6.6 Appeals Procedures

	 	(a)	 	Any request to review the Claims Reviewer’s adverse benefit
determination under the Plan must be filed by a claimant or the claimant’s
authorized representative in writing within 60 days after receipt by the
claimant of written notification of adverse benefit determination by the
Claims Reviewer. If the claimant or the claimant’s authorized representative
fails to file a request for review of the Claims Reviewer’s adverse benefit
determination in writing within 60 days after receipt by the claimant of
written notification of adverse benefit determination, the Claims Reviewer’s
determination shall become final and conclusive.

15

 

	 	(b)	 	Any request to review an adverse benefit determination under
the Plan shall be deemed to be filed when a written request is made by the
claimant or the claimant’s authorized representative addressed to the Employee
Benefits Committee at the address below is received by the Secretary of the
Employee Benefits Committee.

Employee Benefits Committee

c/o Secretary to the Employee Benefits Committee

WS 3B-35

Merck & Co., Inc.

One Merck Drive, P. O. Box 100

Whitehouse Station, NJ 08889-0100

	 	(c)	 	If the claimant or the claimant’s authorized representative
timely files a request for review of the Claims Reviewer’s adverse benefit
determination as specified in this Section 6.6, the Employee Benefits
Committee shall re-examine all issues relevant to the original adverse benefit
determination taking into account all comments, documents, records, and other
information submitted by the claimant or the claimant’s authorized
representative relating to the claim, without regard to whether such
information was submitted or considered in the initial benefit determination.
Any such claimant or his or her duly authorized representative may

	 	(i)	 	upon request and free of charge have reasonable access to, and copies of, all
documents, records, and other information relevant to the claimant’s claim for benefits;
whether an item is relevant shall be determined by the Employee Benefits Committee in
accordance with 29 CFR 2560.503-1 (m)(8); and
	 
	 	(ii)	 	submit in writing any comments, documents,
records, and other information relating to the claim for benefits.

	 	(d)	 	The Employee Benefits Committee shall provide written or
electronic notice to the claimant or the claimant’s authorized representative
of its benefit determination on review. Such notice shall be provided within
a reasonable time but not later than 60 days after the receipt by the Employee
Benefits Committee of the claimant’s request for review, unless the Employee
Benefits Committee determines that special circumstances require an extension
of time for processing the request for review. If the Employee Benefits
Committee determines that an extension of time for processing is required,
written notice of the extension shall be furnished to the claimant before the
expiration of the initial 60-day period indicating the special circumstances
requiring an extension and the date by which the Employee Benefits

16

 

	 	 	 	Committee expects to render the benefit determination. No extension can
exceed 60 days from the end of the initial 60-day period (i.e., 120 days
from the date the request for review is received by the Employee Benefits
Committee) without the consent of the claimant or the claimant’s
authorized representative.
	 
	 	(e)	 	If the claimant’s appeal is denied, the notice of adverse
benefit determination on review shall be written in a manner calculated to be
understood by the claimant and shall:

	 	(i)	 	set forth the specific reasons for the
adverse benefit determination on review;
	 
	 	(ii)	 	contain specific references to Plan provisions on which the
benefit determination is based;
	 
	 	(iii)	 	contain a statement that the claimant is
entitled to receive, upon request and free of charge, reasonable
access to, and copies of, all documents, records, and other
information relevant to the claimant’s claim for benefits; whether an
item is relevant shall be determined by the Employee Benefits
Committee in accordance with 29 CFR 2560.503-1 (m)(8); and
	 
	 	(iv)	 	include a statement of the claimant’s right
to bring a civil action under section 502(a) of ERISA.

17

 

6.7 Amendment or Termination — The Company reserves the right to amend
or terminate the Plan at any time without prior notice to or the consent of any employee.
The U.S. Compensation and Benefits Committee of Merck & Co., Inc., with the concurrence of
the Chief Executive Officer of Merck & Co., Inc., has the authority to amend or terminate
this Plan; provided, however, that amendments that apply only to Section 16 Officers must
also be approved by the Compensation and Benefits Committee of the Board of Directors of
Merck or its delegate. Any Eligible Employee whose employment continues after amendment
of the Plan and, other than to the extent specifically provided in this Section 6.7, the
Separation Plan Benefits of any Covered Employee who experienced a Separation From Service
prior to such amendment, shall be governed by the terms of the Plan as so amended. Any
Eligible Employee whose employment continues after termination of the Plan and, other than
to the extent specifically provided in this Section 6.7, any Covered Employee who
experienced a Separation From Service prior to such termination, shall have no right to a
benefit under the Plan. A Covered Employee who experiences a Separation From Service prior
to any amendment to the Plan shall not be eligible for any increase in Separation Benefits
under the Plan. Nothing in this Plan in any way limits Merck’s right to amend or terminate
any or all of Merck’s plans that provide Separation Benefits as described in this Plan.

Notwithstanding the foregoing provisions of this Section 6.7, if the amendment or
modification of Schedule E or Schedule F prior to a Change in Control would adversely
affect the benefits or protections hereunder of any individual who is an Eligible Employee
as of the date such amendment or modification is adopted, such amendment or modification
shall be effective as it relates to such individual only if no Change in Control occurs
within one year after such adoption, any such attempted amendment or modification adopted
within one year prior to a Change in Control being null and void ab initio
as it relates to all such individuals who were Eligible Employees prior to such adoption;
provided, further, that neither Schedule E nor Schedule F may be amended or
modified (i) at the request of a third party who has indicated an intention or taken steps
to effect a Change in Control and who effectuates a Change in Control or (ii) otherwise in
connection with, or in anticipation of, a Change in Control which actually occurs, any such
attempted amendment or modification being null and void ab initio. In
addition, this Section 6.7 shall be subject to Section 6.8 upon and following a Change in
Control.

6.8 Additional Provisions.

1. Except to the extent required by applicable law, for the entirety of the Protection
Period, the material terms of the Plan shall not be modified in any manner that is
materially adverse to the Qualifying Participants.

2. During the Protection Period, the Plan may not be amended or modified to reduce or
eliminate the protections set forth in this Section 6.8 and may not be terminated.

18

 

3. The Company shall pay all legal fees and related expenses (including the costs of
experts, evidence and counsel) reasonably and in good faith incurred by a Qualifying
Participant if the Qualifying Participant prevails on his or her claim for relief in an
action (x) by the Qualifying Participant claiming that the provisions of this Section 6.8
have been violated (but, for avoidance of doubt, excluding claims for plan benefits in the
ordinary course) and (y) if applicable, by the Company or the Qualifying Participant’s
employer to enforce post-termination covenants against the Qualifying Participant.

4. Definitions. For purposes of this Section 6.8:

     (a) “Protection Period” shall mean the period beginning on the date of the
Change in Control and ending on the second anniversary of the date of the Change in
Control; and

     (b) “Qualifying Participants” shall mean those individuals who participate in
the Plan (whether as current or former employees) as of immediately prior to the Change in
Control.

SECTION 7

GENERAL PROVISIONS

7.1 Unfunded Obligation — All Separation Pay and Pay in Lieu of Notice payable under this
Plan and Outplacement Benefits provided under this Plan shall constitute an unfunded
obligation of the Company. Payments shall be made, as due, from the general funds of the
Company. This Plan shall constitute solely an unsecured promise by the Company to pay such
benefits to Eligible Employees and to Covered Employees to the extent provided herein.
Participant contributions are required for Separation Benefits. Separation Benefits
under this Plan provide Covered Employees with eligibility for continued medical, dental
and life insurance coverage under the applicable Merck plans and Schedule E and Schedule F
of this Plan provide Eligible Employees with eligibility for certain retirement benefits
under the applicable Merck plans. This Plan does not provide the substantive benefits
under those plans.

7.2 Applicable Law — It is intended that the Plan be an “employee welfare benefit plan”
within the meaning of Section 3(1) of ERISA, and the Plan shall be administered in a manner
consistent with such intent. The Plan and all rights thereunder shall be governed and
construed in accordance with ERISA and, to the extent not preempted by federal law, with
the laws of the state of New Jersey, wherein venue shall lie for any dispute arising
hereunder.

7.3 Severability — If any provision of this Plan shall be held illegal or invalid for any
reason, said illegality or invalidity shall not affect the remaining parts of
this Plan, but this Plan shall be construed and enforced as if said illegal or invalid
provision had never been included herein.

7.4 Employment at Will — Nothing contained in this Plan shall give an employee the right to
be retained in the employment of the Company or shall otherwise modify the employee’s at
will employment relationship with Merck. This Plan is not a contract of employment between
the Company and any employee.

19

 

SCHEDULE A

In addition to Merck & Co., Inc., the following employers participate in this Plan:

Merck and Company, Incorporated

Merck Holdings, Inc.

Merck Liability Management Company

KBI Enterprises, Inc.

Rosetta Inpharmatics LLC

Aton Pharma, Inc.

Abmaxis, Inc.

Glycofi, Inc.

20

 

SCHEDULE B-1

Effective November 1, 2005

Separation Pay for Covered Employees whose Separation From Service

occurs on or after November 1, 2005 but before January 1, 2009

For purposes of calculating Separation Pay and Pay in Lieu of Notice:

A “days pay” means the Covered Employee’s Annual Base Salary in effect on the date
the Covered Employee experiences a Separation in Service divided by 260. A “weeks
pay” means a “days pay” multiplied by five.

SEPARATION PAY

	 	 	 
	Grade Level	 	Separation Pay
	Non-Exempt

	 	2 weeks pay + an additional 2 weeks
pay per complete year of Continuous
Service.
	 

	 	Maximum of 78 weeks.
	 
	 	 
	7-9

	 	4 weeks pay + an additional 2 weeks
pay per complete year of Continuous
Service.
	 

	 	Maximum of 78 weeks.
	 
	 	 
	5-6

	 	12 weeks pay + an additional 2 weeks
pay per complete year of Continuous
Service.
	 

	 	Maximum of 78 weeks.
	 
	 	 
	4

	 	12 weeks pay + an additional 2 weeks
pay per complete year of Continuous
Service.
	 

	 	Maximum of 78 weeks.
	 
	 	 
	1-3
with less than 1 complete year of
Continuous Service

	 	26 weeks pay
	 
	 	 
	1-3
with at least 1 complete year but
less than 2 complete years of
Continuous Service

	 	41 weeks pay
	 
	 	 
	1-3
with at least 2 complete years of
Continuous Service

	 	41 weeks pay + an additional 2 weeks
pay per complete year of Continuous
Service

Maximum of 78 weeks.

21

 

SCHEDULE B-2

Effective November 1, 2005

Separation Pay for Covered Employees whose Separation From Service

occurs before November 1, 2005 or after December 31, 2008

For purposes of calculating Separation Pay and Pay in Lieu of Notice:

A “days pay” means the Covered Employee’s Annual Base Salary in effect on the date
the Covered Employee experiences a Separation in Service divided by 260. A “weeks
pay” means a “days pay” multiplied by five.

SEPARATION PAY

	 	 	 
	Grade Level	 	Separation Pay
	Non-Exempt

	 	2 weeks pay + an additional 2 weeks pay per complete year of
Continuous Service.
	 

	 	Maximum of 52 weeks.
	 
	 	 
	7-9

	 	3 weeks pay + an additional 2 weeks pay per complete year of
Continuous Service.
	 

	 	Maximum of 52 weeks.
	 
	 	 
	5-6

	 	4 weeks pay + an additional 2 weeks pay per complete year of
Continuous Service.
	 

	 	Maximum of 52 weeks.
	 
	 	 
	4

	 	12 weeks pay + an additional 2 weeks pay per complete year of
Continuous Service.
	 

	 	Maximum of 52 weeks.
	 
	 	 
	1-3

	 	26 weeks pay + an additional 2 weeks pay per complete year of
Continuous Service
	 

	 	Maximum of 52 weeks.

22

 

SCHEDULE C

PAY IN LIEU OF NOTICE

	 	 	 
	Years of Service	 	Notice Period or Pay in Lieu of Notice
	Less than 2
complete years of
Continuous Service

	 	2 weeks notice and pay OR 2 weeks Pay in Lieu of Notice.
	 
	 	 
	2 or more complete
years of Continuous
Service

	 	4 weeks notice and pay OR 4 weeks Pay in Lieu of Notice.

23

 

SCHEDULE D

OUTPLACEMENT BENEFITS

	 	 	 	 	 
	GRADE LEVEL	 	PROGRAM NAME	 	DURATION
	Non-Exempt

	 	Individual Career Transition

Seminar & Counseling
	 	2 Day seminar plus four
(4) workshop modules and
six (6) individual
follow-up counseling
sessions and use of
center for 3 months
	 
	 	 	 	 
	7-9

	 	Career Assistance Program
	 	3 Months
	 
	 	 	 	 
	5-6

	 	Career Transition Service
	 	6 Months
	 
	 	 	 	 
	4

	 	Executive Service
	 	12 Months
	 
	 	 	 	 
	1-3

	 	Senior Executive Service
	 	12 Months

The Outplacement Benefits are provided through a third party vendor. The programs listed above are
the programs in effect through the vendor engaged by Merck as of November 1, 2005 to provide such
services. The vendor and/or the programs may change from time to time.

24

 

SCHEDULE E (Change in Control/Pension)

Description of Change-in-Control Benefits under the

Merck & Co., Inc. Salaried Retirement Plan (the “Pension Plan”)

     This Schedule describes benefits under the Pension Plan and the Supplemental Plan
provided to an Eligible Employee under the Plan if such Eligible Employee signs and returns
the release of claims in use under the CIC Plan.

I. If an Eligible Employee’s employment is terminated in circumstances entitling him or her
to the benefits provided in Section 3(b) of the Plan:

     1. For an Eligible Employee who participates in the Pension Plan and on his or
her Separation Date is not at least age 55 with at least ten years of Credited
Service under the Pension Plan but would attain at least age 50 and have at least
ten years of Credited Service under the Pension Plan within two years following the
date of the Change in Control (assuming continued employment during the entirety of
such two-year period), then the Eligible Employee shall be deemed to be eligible
for a subsidized early retirement benefit under the Pension Plan commencing no
earlier than age 55 based on his or her Credited Service under the Pension Plan
accrued as of his or her Separation Date.

     2. For an Eligible Employee who participates in the Pension Plan and on his or
her Separation Date is not at least age 65 but would attain at least age 65 within
two years following the date of the Change in Control without regard to years of
Credited Service (assuming continued employment during the entirety of such
two-year period), then the Eligible Employee shall be deemed to be eligible for a
benefit unreduced for early commencement under the Pension Plan commencing as soon
after his or her Separation Date that he or she elects to commence to receive
benefits.

     3. For an Eligible Employee who participates in the Pension Plan and on his or her
Separation Date is not eligible for the “Rule of 85 Transition Benefit” (as such
term is defined in the Pension Plan) but would have been eligible for the Rule of
85 Transition Benefit within two years following the date of the Change in Control
(assuming continued employment during the entirety of such two-year period), then
the Eligible Employee shall be deemed to be eligible for the Rule of 85 Transition
Benefit upon commencement of his or her pension benefit under the Pension Plan.

II. The benefits described in this Schedule E shall be payable from the Pension Plan and,
to the extent that such benefits cannot be paid from the Pension Plan, the Company may, to
the extent it deems necessary or appropriate (including to comply with applicable law and
to preserve grandfathered status of arrangements subject to Section 409A of the Code),
cause such benefits to be paid
under the Supplemental Plan or under new arrangements or from the Company’s general assets.

25

 

SCHEDULE F (Change in Control/Retiree Healthcare and Life Insurance)

Description of Change-in-Control Benefits under the Merck & Co., Inc. Medical Plan for

Nonunion Employees and the Merck & Co., Inc. Dental Plan for Nonunion Employees (which

plans are part of the Merck & Co., Inc. Medical, Dental and Long-Term Disability Program

for Nonunion Employees) (the “Health Plan”) and the Merck & Co., Inc. Group Term Life and

Optional Insurance Plan (the “Life Insurance Plan”)

     This Schedule describes benefits under the Health Plan and the Life Insurance Plan
provided to an Eligible Employee under the Plan if such Eligible Employee signs and returns
the release of claims in use under the CIC Plan.

I. If an Eligible Employee’s employment is terminated in circumstances entitling him or her
to the benefits provided in Section 3(b) of the Plan:

          (1) If the Eligible Employee is eligible to participate in the Health Plan and on his
or her Separation Date is not at least age 55 with the requisite amount of service with an
Employer to satisfy the requirements to be considered a retiree under the Health Plan but
would attain at least age 50 and meet the service requirements to be considered a retiree
under the Health Plan within two years following the date of the Change in Control
(assuming continued employment during the entirety of such two-year period), then the
Eligible Employee shall be eligible for retiree healthcare benefits under the Health Plan
on his or her Separation Date on the same terms and conditions applicable to salaried
U.S.-based employees of the Company whose employment terminated the last day of the month
prior to the Eligible Employee’s Separation Date who were treated as retirees under the
Health Plan as of that date.

          (2) If the Eligible Employee is eligible to participate in the Health Plan and on his
or her Separation Date is not either at least age 65 or at least age 55 with the requisite
amount of service with an Employer to satisfy the requirements to be considered a retiree
under the Life Insurance Plan but would attain at least age 65 or at least age 50 and meet
the service requirements to be considered a retiree under the Life Insurance Plan within
two years following the date of the Change in Control (assuming continued employment during
the entirety of such two-year period), then the Eligible Employee shall be eligible for
retiree life insurance benefits under the Life Insurance Plan on his or her Separation Date
on the same terms and conditions applicable to salaried U.S.-based employees of the Company
whose employment terminated the last day of the month prior to the Eligible Employee’s
Separation Date who were treated as retirees under the Life Insurance Plan as of that date.

II. The Company may, to the extent it deems necessary or appropriate (including to comply
with applicable law and to preserve grandfathered status of arrangements subject to Section
409A of the Code), cause the benefits set forth in
this Schedule F to be provided from insured arrangements, or pursuant to new arrangements,
individual arrangements or otherwise.

26

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