1 [LETTERHEAD OF ARTHUR ANDERSEN LLP] EXHIBIT 15 To Delta Air Lines, Inc.: We are aware that Delta Air Lines, Inc. has incorporated by reference in its Registration Statement Nos. 2-94541, 33-30454, 33-65391, 333-16471, 333-49553, 333-58647, 333-92291 and 333-94991 in its Form 10-Q for the quarter ended December 31, 1999, which includes our report dated February 4, 2000 covering the unaudited interim financial information contained therein. Pursuant to Regulation C of the Securities Act of 1933 (the "Act"), that report is not considered a part of the Registration Statements prepared or certified by our firm or a report prepared or certified by our firm within the meaning of Sections 7 and 11 of the Act. /s/ Arthur Andersen LLP - ------------------------------------- Atlanta, Georgia February 7, 2000