Exhibit 12.1


Certification Pursuant to Rule 13a-14(a) or Rule 15d-14(a) 
of the Securities Exchange Act of 1934



| | 1. | I have reviewed this annual report on Form 20-F of Grupo Aeroportuario del Sureste, S.A. de C.V;                                                                                                                                                                                                         
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| | 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state	a
material fact necessary to make the statements made, in light of the circumstances under which suchstatements were made, not misleading with respect to the period covered by this report;
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| | 3. | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company
as of, and for, the periods presented in this report;                     
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| | 4. | The companys other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the company and
have:                                                                                 
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| | 5. | The companys other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the companys auditors and the audit committee of the companys board of directors (or persons performing the equivalent functions):                
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Date: June 22, 2005



| | /s/ Adolfo Castro Rivas                   
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| | Adolfo Castro RivasChief Financial Officer

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