UNOFFICIAL ENGLISH TRANSLATION

Relevant Matters. To resolve any of the following matters, the unanimous affirmative vote of each of the directors of ITA in a duly installed board of directors meeting pursuant to ITA’s by-laws, or the assistance and affirmative vote of the 100% (one hundred percent) of the representative shares of the capital stock of ITA in a general shareholders meeting, duly installed pursuant to ITA’s by-laws, within the competence of each of the abovementioned corporate bodies:

Any mergers or splits of ITA;

The adoption of any resolution to dissolve and liquidate ITA or other procedure of insolvency, or for the judicial administration of ITA;

Amendments or termination, for any reason, of (a) the Technical Assistance Agreement, entered as of December 19, 1998 by and between ITA, ASUR, Servicios Aeroportuarios del Sureste, S.A. de C.V. and Aeropuerto de Cancún, S.A. de C.V., Aeropuerto de Cozumel, S.A. de C.V., Aeropuerto de Huatulco, S.A. de C.V., Aeropuerto ▇▇ ▇▇▇▇▇▇, ▇.▇. de C.V., Aeropuerto de Minatitlán, S.A.

de C.V., Aeropuerto de Oaxaca, S.A. de C.V., Aeropuerto de Tapachula, S.A. de C.V., Aeropuerto de Veracruz, S.A. de C.V., y Aeropuerto de Villahermosa, S.A. de C.V. (jointly, the abovementioned companies and ASUR, the “Airport Group”); (b) the Participation Agreement, entered as of December 18, 1998, by and between the Federal Government of the United Mexican States, through the Ministry of Transportation and Communications, the Airport Group and ITA; (c) the Trust Agreement entered as of December 18, 1998, by and between ITA in its capacity as settlor-beneficiary, ASUR in its character as second place beneficiary and Banco Nacional de Comercio Exterior, S.N.C. División Fiduciaria in its capacity as trustee; (d) the General Guidelines for the Investment in the Mexican Airports System, published as of February 9, 1998, in the Official Federal Gazette; (e) the announcement for the acquisition of the share certificates representative of the capital stock of ASUR, Aeropuerto de Cancún, S.A. de C.V., Aeropuerto de Cozumel, S.A. de C.V., Aeropuerto de Huatulco, S.A. de C.V., Aeropuerto ▇▇ ▇▇▇▇▇▇, ▇.▇. de C.V., Aeropuerto de Minatitlán, S.A. de C.V., Aeropuerto de Oaxaca, S.A. de C.V., Aeropuerto de Tapachula, S.A. de C.V., Aeropuerto de Veracruz, S.A. de C.V., and Aeropuerto de Villahermosa, S.A. de C.V.; and (f) the Rating Formulary for the interested people to participate in the announcement for the acquisition of the share certificates representative of the capital stock of ASUR dated June 29, 1998, as well as any other document related to the privatization of the Mexican airport system and with the acquisition of the share certificates representative of the capital stock of ASUR or other document of the abovementioned privatization in which ITA is a party;

The exercise the right of veto of ITA in the General Shareholders Meetings of ASUR pursuant to the by-laws of the latter;

Instruction to the members of the Board of Directors of ASUR appointed by ITA in regards to the appointment or removal of (i) the CEO of ASUR, (ii) half of the first level officials of ASUR, and (iii) any member of the Comité Operativo, of the Comité de Nominaciones y Compensaciones and of the Comité de Adquisiciones y Contratos and the alternates to such members which the directors appointed by ITA are entitled to appoint or remove;

Appointment or removal of the CEO of ITA and the determination of its annual salary, in the event, the shareholders meeting of ITA unanimously resolved to create the position of CEO for ITA;

Appointment or removal of the statutory examiner and of the auditors of ITA;

Any type of transfer of the (alienate, sell, transfer, assign, donate or any other way to dispose of) Shares different from the allowed transfers to an affiliate. Affiliate shall be understood as: (a) in connection to any person, which is not an individual, this is any other company, association, firm, trust, organization without legal capacity, Authority or other entity, which controls, is controlled or which is under the joint control, of the controlling companies of such Person. In connection with individuals, it means the spouse, the ascendants, descendants in direct line and the consanguinity and affinity relatives up to the second degree and the heirs of such Persons, or any other Person under the guardianship of any of the latter. Likewise, “Control” means the direct or indirect possession, or the authority to determinate or cause to determinate, the administration and policies of an entity, whether it is through the possession o property of securities, quotas or participation with voting rights, by means of an agreement or in any other manner, and to be “Control”, to “Controlled” or being “Controlled” have the same meanings;

Sell or alienation of Shares of ASUR property of ITA;

The way in which the voting rights of the shares of ASUR property of ITA will be exercised in connection with the approval of the development master program, the business plan and the investments plan for ASUR and any amendments to the latter, in the event such points are mentioned in the general shareholders meeting of ASUR;

Approval and modification of the financial budgets, investments and plans, and of the audited annual financial information of ITA;

Proposals for the amendment of the by-laws of ITA including any increase or decrease of capital stock, contributions for future capital stock increases or modifications, of any type, to the capital stock;

Investments made by ITA which amounts exceeds $500,000.00 (Five hundred thousand dollars 0/100) in other companies or business including ITA’s;

Any agreements entered by and between ITA and any party and/or any Affiliate of the parties;

Execution, amendment and termination of any services agreement which amount exceeds $500,000.00 (Five hundred thousand dollars 0/100) or its equivalent in any other currency which were not provided in the agreed business plan or budget or if the latter are amended;

The execution of loans or funding agreements by ITA for an amout equal or superior to $500,000.00 (Five hundred thousand dollars 0/100) or its equivalent in any other currency or granting guaranties under those agreements.

Granting loans to third parties or granting guaranties, endorsments or other similar in regards to obligations of third parties, including, but not limited to, ASUR, Aeropuerto de Cancún, S.A. de C.V., Aeropuerto de Cozumel, S.A. de C.V., Aeropuerto de Huatulco, S.A. de C.V., Aeropuerto ▇▇ ▇▇▇▇▇▇, ▇.▇. de C.V., Aeropuerto de Minatitlán, S.A. de C.V., Aeropuerto de Oaxaca, S.A. de C.V., Aeropuerto de Tapachula, S.A. de C.V., Aeropuerto de Veracruz, S.A. de C.V., y Aeropuerto de Villahermosa, S.A. de C.V., Caribbean Logistics, S.A. de C.V., Cargo RF, S.A. de C.V. y Cancún Airport Services, S.A. de C.V., and Servicios Aeroportuarios del Sureste, S.A. de C.V.

The beginning or ratification of any relevant legal proceeding by ITA, including the filing of any lawsuit before Mexican or foreign authorities.

The way in which the shares property of ITA will be voted in the following companies ASUR, Aeropuerto de Cancún, S.A. de C.V., Aeropuerto de Cozumel, S.A. de C.V., Aeropuerto de Huatulco, S.A. de C.V., Aeropuerto ▇▇ ▇▇▇▇▇▇, ▇.▇. de C.V., Aeropuerto de Minatitlán, S.A. de C.V., Aeropuerto de Oaxaca, S.A. de C.V., Aeropuerto de Tapachula, S.A. de C.V., Aeropuerto de Veracruz, S.A. de C.V., y Aeropuerto de Villahermosa, S.A. de C.V., Caribbean Logistics, S.A. de C.V., Cargo RF, S.A. de C.V. y Cancún Airport Services, S.A. de C.V., and Servicios Aeroportuarios del Sureste, S.A. de C.V., in which ITA haves a participation and that were adjourned as applicable pursuant to their by-laws or the Applicable Law, to vote any of the issues mentioned in sections (i) through (xviii) of this side letter.