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 May, 2007

Commission File Number 1-14728

Lan Airlines S.A.

(Translation of registrant's name into English)

Presidente Riesco 5711, Piso 20

Las Condes

Santiago, Chile

(Address of principal executive office)

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

Form 20-F      X     Form 40-F            

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):  

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             No      X   

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

Explanatory Note

This Report on Form 6-K contains the following exhibit, which is hereby incorporated by reference as Exhibit 1.1 to the registrant’s Registration Statement Form F-3 (File No. 333-142665).

Exhibit 1.1 Form of Underwriting Agreement.

SIGNATURE

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.

Date: May 17, 2007

Lan Airlines S.A.

/s/ Jose Miguel Bambach 
By: Jose Miguel Bambach   
General Counsel    

EXHIBIT INDEX

Number	Description
1.1	Form of Underwriting Agreement.