Results of Operations

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): October 9, 2025 DELTA AIR LINES, INC. (Exact name of registrant as specified in its charter) Delaware 001-05424 58-0218548 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) Post Office Box 20706 Atlanta , Georgia 30320-6001 (Address of principal executive offices and zip code) Registrant's telephone number, including area code: ( 404 ) 715-2600 Registrant's Web site address: www.delta.com Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (See General Instruction A.2. below): ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol Name of each exchange on which registered Common Stock, par value $0.0001 per share DAL New York Stock Exchange Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR 230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR 240.12b-2). Emerging growth company     ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ Item 2.02    Results of Operations and Financial Condition Delta Air Lines, Inc. today issued a press release reporting financial results for the quarter ended September 30, 2025. The press release is furnished as Exhibit 99.1 to this Form 8-K. The information furnished in this Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed incorporated by reference into any other filing with the Securities and Exchange Commission. Item 9.01    Financial Statements and Exhibits (d) Exhibits. Exhibit 99.1 Press Release dated October 9, 2025 titled "Delta Air Lines Announces September Quarter 2025 Financial Results" Exhibit 104 The cover page from this Current Report on Form 8-K, formatted in Inline XBRL 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 hereunto duly authorized. DELTA AIR LINES, INC. By: /s/ Daniel C. Janki Daniel C. Janki Executive Vice President & Chief Financial Officer Date: October 9, 2025