UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549



FORM 6-K




REPORT OF FOREIGN PRIVATE
  ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER
  THE SECURITIES EXCHANGE ACT OF 1934

For the month of April 2005

|GRUPO AEROPORTUARIO DEL SURESTE S.A. DE C.V.
      (SOUTHEAST AIRPORT GROUP)
|----------------------------------------------------------------------------
|                                                                            
|(Translation of Registrants Name Into English)                             

|México                                         
|-----------------------------------------------
|                                               
|(Jurisdiction of incorporation or organization)



|Bosque de Alisos No. 474 — 4th Floor
      Bosques de las Lomas
      05120 México, D.F.
|----------------------------------------------------------------------------------------
|                                                                                        
|(Address of principal executive offices)                                                

(Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.)

Form 20-F x  Form 40-F

(Indicate by check mark whether the Registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.)

Yes  Nox


(If Yes is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-.)

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Copenhagen Airports A/S increases investment in 
ASURs strategic partner, from 36.5% to 49%

Mexico City, April 29th 2005, Grupo Aeroportuario del Sureste, S.A. de C.V. (NYSE: ASR; BMV: ASUR)(ASUR) the first privatized airport group in Mexico and operator of Cancun Airport and eight others in the southeast of Mexico, has been informed by ASURs strategic partner, Inversiones y Técnicas Aeroportuarias, S.A. de C.V. (ITA), that Copenhagen Airports A/S (CPH) has increased its participation in ITA from 36.5% to 49%.

Since 1998, CPH has been a co-owner of ITA. The remaining 51% of ITAs share capital is owned by the Mexican businessman Fernando Chico Pardo.

ITA owns 15% of ASUR and provides ASUR with technical assistance and consulting services.

About ASUR:

Grupo Aeroportuario del Sureste, S.A. de C.V. (ASUR) is a Mexican airport operator with concessions to operate, maintain and develop the airports of Cancun, Merida, ozumel, Villahermosa, Oaxaca, Veracruz, Huatulco, Tapachula and Minatitlan in the southeast of Mexico. The Company is listed both on the NYSE in the U.S., where it trades under the symbol ASR, and on the Mexican Bolsa, where it trades under the symbol ASUR. One ADS represents ten (10) series B shares.

Some of the statements contained in this press release discuss future expectations or state other forward-looking information. Those statements are subject to risks identified in this press release and in ASURs filings with the SEC. Actual developments could differ significantly from those contemplated in these forward-looking statements. The forward-looking information is based on various factors and was derived using numerous assumptions. Our forward-looking statements speak only as of the date they are made and, except as may be required by applicable law, we do not have an obligation to update or revise them, whether as a result of new information, future or otherwise.

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# SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

| | Grupo Aeroportuario del Sureste, S.A. de C.V.                                                      
| | ---------------------------------------------------------------------------------------------------
| |                                                                                                    
| | By:   /s/ ADOLFO CASTRO RIVAS
               Adolfo Castro Rivas
               Director of Finance

Date: April 29, 2005