Allegiant Travel Company and Sun Country Airlines are providing supplemental disclosures to their joint proxy statement/prospectus regarding their pending merger. The filing addresses two lawsuits and several demand letters from stockholders alleging disclosure deficiencies. While denying the merit of these claims, the companies are providing additional information to moot the claims and avoid potential delays to the merger. The supplemental information includes updated financial forecasts for both Allegiant and Sun Country, as well as additional details regarding the financial advisor analyses performed by Barclays and Goldman Sachs. Both companies are scheduled to hold special stockholder meetings on May 8, 2026, to vote on the merger.