FORM10-Q (Mark One) ☒QUARTERLY REPORT PURSUANT TO SECTION13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934For the quarterly period ended March31, 2026 or ☐TRANSITION REPORT PURSUANT TO SECTION13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _______ to_______ Commission File Number001-33166 Allegiant Travel Company(Exact Name of Registrant as Specified in Its Charter) 20-4745737 Nevada Registrant’s Telephone Number,Including Area Code:(702) 851-7300 Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filingrequirements for the past 90 days.Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 ofRegulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit suchfiles).Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.See definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule12b-2 of the Exchange Act. (Check one): Large accelerated filer☒Non-accelerated filer☐Emerging growth company☐ As of April29, 2026, the registrant had 18,437,290 shares of common stock, $0.001 par value per share, outstanding. ALLEGIANT TRAVEL COMPANYFORM10-QTABLE OF CONTENTS PART I.FINANCIAL INFORMATIONITEM 1.Consolidated Financial Statements3ITEM 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations17ITEM 3.Quantitative and Qualitative Disclosures About Market Risk26ITEM 4.Controls and Procedures26PART II.OTHER INFORMATIONITEM 1.Legal Proceedings27ITEM 1A.Risk Factors27ITEM 2.Unregistered Sales of Equity Securities and Use of Proceeds27ITEM 3.Defaults Upon Senior Securities27ITEM 4.Mine Safety Disclosures27ITEM 5.Other Information27ITEM 6.Exhibits28Signatures29 ALLEGIANT TRAVEL COMPANYCONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME(in thousands)(unaudited) ALLEGIANT TRAVEL COMPANYCONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY(in thousands)(unaudited) ALLEGIANT TRAVEL COMPANYNOTES TO CONSOLIDATED FINANCIAL STATEMENTS(unaudited) Note 1 — Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited consolidated financial statements include the accounts of Allegiant Travel Company (the “Company”) andits majority-owned operating subsidiaries. The Company's investments in unconsolidated affiliates, which are50 percentor less owned,are accounted for under the equity or cost method, and are insignificant to the consolidated financial statements. All intercompanybalances and transactions have been eliminated. These unaudited consolidated financial statements reflect all normal recurring adjustments which management believes are necessaryto present fairly the financial position, results of operations, and cash flows of the Company for the respective periods presented.Certain information and footnote disclosures normally included in the annual consolidated financial statements prepared in accordancewith U.S. generally accepted accounting principles ("U.S. GAAP") have been omitted pursuant to the rules and regulations of theSecurities and Exchange Commission for Form 10-Q. These unaudited interim consolidated financial statements should be read inconjunction with the audited consolidated financial statements of the Company and notes thereto included in the annual report of theCompany on Form 10-K for the year ended December31, 2025 and filed with the Securities and Exchange Commission. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions thataffect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities, at the date of the financialstatements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from theseestimates. Operating results for the three months ended March 31, 2026 are not necessarily indicative of operating results for the entire year dueto the seasonal nature of leisure travel, the volatility of aircraft fuel prices, and other macroeconomic factors. The Company has reclassified certain prior period amounts to conform to the current period presentation. Note 2 — Special Charges Airline The Company has identified airframes for early retirement to coincide with 737 MAX aircraft deliveries as scheduled under anamendment to the Company's agreement with The Boeing Company signed in September 2023. To date, the Co