DALDelta Air Lines

No new paragraphs in Risk Factors, or fewer than two 10-Ks to compare.

New in the latest 10-Q

5 paragraphs in the 10-Q filed Oct 9, 2026 with nothing like them in the 10-Q filed Jul 10, 2026 (at least half the words must differ; new numbers alone do not count). Quoted exactly, grouped by the item heading above them. This is text that changed, not a judgement of how serious it is.

10-Q

Number of shares outstanding by each class of common stock, as of September 30, 2026

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MD&A

Contracted Services. The increase in contracted services primarily resulted from expanding our in-flight entertainment and Wi-Fi products, volume increases in our Cargo business and additional contract labor costs associated with the expansion of our Sky Club network, particularly our Delta One lounges.

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Depreciation and Amortization. The increase in depreciation and amortization results from new aircraft deliveries and fleet modifications, partially offset by aircraft retirements.

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Aircraft Rent. Aircraft rent increased primarily related to additional engine leases to support our operation.

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Item 6

3.1 (a) Delta's Amended and Restated Certificate of Incorporation (Filed as Exhibit 3.1 to Delta's Current Report on Form 8-K as filed on April 30, 2007).* 3.1 (b) Amendment to Amended and Restated Certificate of Incorporation (Filed as Exhibit 3.1 to Delta's Current Report on Form 8-K as filed on June 27, 2014).* 3.2 Delta's Bylaws (Filed as Exhibit 3.1 to Delta's Current Report on Form 8-K as filed on December 9, 2022).* 4.1 Description of Registrant's Securities (Filed as Exhibit 4.1 to Delta's Annual Report on Form 10-K for the year ended December 31, 2020).* 10.1 (a) Supplemental Agreement No. 5, dated September 29, 2026, to Purchase Agreement No. PA-04696, dated July 18, 2022, between The Boeing Company and Delta Air Lines, Inc. relating to Boeing Model 737-10 Aircraft ("Supplemental Agreement No. 5").** 10.1 (b) Letter Agreements, dated September 29, 2026, relating to Supplemental Agreement No. 5.** 15 Letter from Ernst & Young LLP regarding unaudited interim financial information. 31.1 Certification by Delta's Chief Executive Officer with respect to Delta's Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2026. 31.2 Certification by Delta's Chief Financial Officer with respect to Delta's Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2026. 32 Certification pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code by Delta's Chief Executive Officer and Chief Financial Officer with respect to Delta's Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2026. 101. INS Inline XBRL Instance Document - The instance document does not appear in the interactive data file because its XBRL tags are embedded within the Inline XBRL document. 101. SCH Inline XBRL Taxonomy Extension Schema Document 101. CAL Inline XBRL Taxonomy Extension Calculation Linkbase Document 101. DEF Inline XBRL Taxonomy Extension Definition Linkbase Document 101. LAB Inline XBRL Taxonomy Extension Labels Linkbase Document 101. PRE Inline XBRL Taxonomy Extension Presentation Linkbase Document 104 The cover page from this Quarterly Report on Form 10-Q for the quarter ended September 30, 2026, formatted in Inline XBRL (included in Exhibit 101) Incorporated by reference. Portions of this exhibit have been omitted as confidential information.

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The 10-Q's risk factors against the 10-K

Item 1A of the 10-Q filed Oct 9, 2026 against Item 1A of the 10-K filed Feb 11, 2026. A 10-Q repeats only the risks that changed, so a 10-K paragraph that is missing from it is not counted as removed. Added is a paragraph with nothing like it in the 10-K, Reworded a sentence that is in both with several words changed, Quiet changes a sentence in both where one to four words changed and one is a hedge or a modal (cut words struck through, new words highlighted and underlined). Text on the page, not a score; each links to the filing at sec.gov.

What the 10-Q itself says about its risk factors:
“Item 1A. Risk Factors” of our Form 10-K includes a discussion of our known material risk factors, other than risks that could apply to any issuer or offering. There have been no material changes from the risk factors described in our Form 10-K.

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1 paragraph in the 10-Q's Item 1A, and none of them adds, rewords or quietly edits a paragraph of the 10-K's.