of Form 8-K. This report and Exhibit 99.1 are deemed to be furnished and are not considered “filed” with the Securities and Exchange Commission. As such, this information shall not be incorporated by reference into any of our reports or other filings made with the Securities and Exchange Commission. Non-GAAP Financial Measures: The press release contains non-GAAP financial measures as such term is defined in Regulation G under the rules of the Securities and Exchange Commission. While the Com…

Regulation FD As previously disclosed, on May 13, 2026, Allegiant Travel Company ("the Company") completed its acquisition of Sun Country Airlines Holdings, Inc. The Company is making available certain unaudited pro forma financial information for the three-month periods ended March 31, 2025, June 30, 2025, September 30, 2025, December 31, 2025, March 31, 2026, and June 30, 2026, and for the year ended December 31, 2025, all reflecting the acquisition on a pro forma basis as if the transactio…

Director — Jude Bricker: A director resigned due to a conflict of interest from starting a new business, which is a standard governance action rather than a sudden executive loss.

Entry into a Material Definitive Agreement. On October 19, 2026, Allegiant Air, LLC, a subsidiary of Allegiant Travel Company (the “Company”), entered into supplemental agreements with The Boeing Company (“Boeing”) documenting the exercise by the Company of the first six options under the 2021 purchase agreement with Boeing, as heretofore amended. The supplemental agreements provide that the six aircraft will be 737-8 aircraft scheduled to be delivered in 2028. With the options being exercise…

CEO — Gregory Anderson: The filing discloses the execution of new employment agreements and compensation terms for existing executives, not a change in personnel or departure.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. On October 13, 2026, the Company, through a wholly owned subsidiary, borrowed the entire $177.5 million available under a previously reported credit facility secured by certain aircraft in the Company’s fleet. The loans under this facility bear interest at a fixed rate, and provide for quarterly amortizing payments beginning in July 2027 over a term of five to six years depending…

of Form 8-K. This report and Exhibit 99.1 are deemed to be furnished and are not considered “filed” with the Securities and Exchange Commission. As such, this information shall not be incorporated by reference into any of our reports or other filings made with the Securities and Exchange Commission. Non-GAAP Financial Measures: The press release contains non-GAAP financial measures as such term is defined in Regulation G under the rules of the Securities and Exchange Commission. While the Com…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. On July 24, 2026, the Company, through a wholly owned subsidiary, entered into a credit facility under which it will be able to borrow up to $177.5 million to be secured by certain Airbus aircraft in the Company’s fleet. Any notes under the facility will bear interest at a fixed rate, based on SOFR plus a margin, to be determined at drawdown and will provide for quarterly amortiz…

Entry into a Material Definitive Agreement. On July 27, 2026, Allegiant Travel Company (the “Company”) and its subsidiary, Allegiant Air, LLC (“Allegiant Air”) entered into an amendment to the PDP Facility Agreement dated November 1, 2023 with Runway Seven Lender LLC (the “Lender”), an entity managed by Carlyle Aviation Management Limited (the “Facility”) involving full-recourse loans (“Loans”) to be made available from time to time. The obligations under the Facility are guaranteed by the Co…

of Form 8-K shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act, as amended, or otherwise subject to liabilities of that section, nor shall they be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as expressly set forth in such filing. This report will not be deemed an admission as to the materiality of any information in the report that is required to be disclosed solely by Regulation FD. Certain f…

of this Current Report on Form 8-K), and all interest, costs, fees, expenses and other amounts due and payable in respect thereof. $25,465,000 aggregate principal amount of the Existing Notes remain outstanding and the Company expects to redeem such remaining Existing Notes in third quarter 2026. The Company will use the balance of the net proceeds of the Notes for general corporate purposes. The Notes are the Company’s senior secured obligations, ranking equally in right of payment with all…

Entry into a Material Definitive Agreement. Issuance of Senior Secured Notes due 2031 On June 24, 2026, Allegiant Travel Company (the “Company”) issued $650.0 million in aggregate principal amount of its 7.125% Senior Secured Notes due 2031 (the “Notes”) pursuant to an Indenture, dated as of June 24, 2026 (the “Indenture”), among the Company, the Guarantors (as defined below) and Wilmington Trust, National Association, as trustee (in such capacity, the “Trustee”) and collateral agent (the “Co…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant The information included in

Regulation FD Disclosure. Pro Forma Financial Information Attached as Exhibit 99.1 are (i) the unaudited pro forma condensed combined statements of income (loss) (referred to as the “pro forma income statements”) for the three months ended March 31, 2026, and for the year ended December 31, 2025, which combine the historical consolidated statements of income (loss) of Allegiant Travel Company (the “Company”) and Sun Country Airlines Holdings, Inc. (“Sun Country”), after giving effect to the a…

below. Such information shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to the liability of that section, and shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as shall be expressly set forth by specific reference in such filing. Aircraft Financing Transactions Since March 31, 2026,…

of Form 8-K and shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that Section. As such, this information shall not be incorporated by reference into any of the Company’s reports or other filings made with the Securities and Exchange Commission. Forward-Looking Statements: Under the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, statements in the shareholder letter…

Completion of Acquisition or Disposition of Assets. Merger Agreement Closing On May 13, 2026 (the “ Closing Date ”), Allegiant Travel Company, a Nevada corporation (“ Allegiant ”), completed the previously announced acquisition of Sun Country Airlines Holdings, Inc., a Delaware corporation (“ Sun Country ”), pursuant to the Agreement and Plan of Merger (the “ Merger Agreement ”), dated January 11, 2026, by and among Allegiant, Sun Country, Mirage Merger Sub, Inc., a Delaware corporation and a…

Director: Three new directors from Sun Country joined Allegiant's Board as part of a merger.

Results of Operations and Financial Condition. On April 30, 2026, Allegiant Travel Company (the “Company”) issued the press release attached as Exhibit 99.1 to this Form 8-K concerning our results of operations for the quarter ended March 31, 2026. The information in Section 2 of this Current Report on Form 8-K and in Exhibit 99.1 is deemed to be furnished and is not to be considered to be “filed” with the Securities and Exchange Commission. As such, this information shall not be incorporated…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. On April 27, 2026, the Company, through a wholly-owned subsidiary, entered into a credit facility to borrow up to $115 million. The loan bears interest at a floating rate based on three-month SOFR plus a margin. The facility provides for a six-month grace period followed by quarterly amortizing payments, with a balloon payment due at maturity in April 2029. The obligations of the…

Other Events. As previously announced, on January 11, 2026, Allegiant Travel Company, a Nevada corporation (“ Allegiant ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”) with Sun Country Airlines Holdings, Inc., a Delaware corporation (“ Sun Country ”), Mirage Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of Allegiant (“ Merger Sub 1 ”), and Sawdust Merger Sub, LLC, a Nevada limited liability company and a direct wholly owned subsidiar…

of Form 8-K shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act, as amended, or otherwise subject to liabilities of that section, nor shall they be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as expressly set forth in such filing. This report will not be deemed an admission as to the materiality of any information in the report that is required to be disclosed solely by Regulation FD. Certain f…

Results of Operations and Financial Condition. On February 4, 2026, Allegiant Travel Company (the “Company”) issued the press release attached as Exhibit 99.1 to this Form 8-K concerning our results of operations for the quarter and year ended December 31, 2025. The information in Section 2 of this Current Report on Form 8-K and in Exhibit 99.1 is deemed to be furnished and is not to be considered to be “filed” with the Securities and Exchange Commission. As such, this information shall not b…

Entry into a Material Definitive Agreement. On January 11, 2026, Allegiant Travel Company, a Nevada corporation (“ Allegiant ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”) with Sun Country Airlines Holdings, Inc., a Delaware corporation (“ Sun Country ”), Mirage Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of Allegiant (“ Merger Sub 1 ”), and Sawdust Merger Sub, LLC, a Nevada limited liability company and a direct wholly owned subs…

Entry into a Material Definitive Agreement. On December 5, 2025, Allegiant Travel Company (the “Company”) entered into an amendment to its Revolving Credit and Guaranty Agreement dated as of August 17, 2022 (the “Credit Agreement”) with Barclays Bank PLC (“Barclays”) as administrative agent. Under the amendment, the facility now allows for borrowings of up to $150.0 million and the maturity date has been extended until December 2030, subject to earlier maturity (in May 2027) based on the stat…