🧾 What This Document Is

This is a Form 425 filing. Think of it as a required public update about a major deal. It specifically shares the cover page of the "definitive proxy statement/prospectus" that was mailed to shareholders of both Allegiant and Sun Country around March 31, 2026.

👉 In simple terms: This isn't the merger announcement itself, but the formal voting document sent to investors to get their official approval for the deal that was previously announced.

🏢 What The Companies Do

• Sun Country Airlines (SNCY): A hybrid low-cost airline based in Minneapolis, MN. It focuses on leisure travel, flying passengers and cargo to destinations across the U.S., Mexico, Central America, and the Caribbean.
• Allegiant Travel Company: The parent company of Allegiant Air, another ultra-low-cost carrier focused on leisure travelers. It's headquartered in Las Vegas, NV.

👉 The deal is about Allegiant acquiring Sun Country, combining two significant players in the budget leisure travel market.

🚀 The Deal & Timeline

The core event is the pending acquisition of Sun Country by Allegiant. This filing outlines the shareholder voting process.

• Action Required: Stockholders of both companies need to vote on the merger.
• Key Date: The proxy materials were mailed on or about March 31, 2026.
• What's Next: The deal will close after receiving necessary approvals and meeting other conditions.

📅 Important Dates & Documents

This filing acts as a signpost pointing to more detailed information. Key documents and their locations are specified:

• For Allegiant's info: See their 2025 Annual Report (10-K) filed on Feb 26, 2026, and amended on March 26, 2026. Further details are in the joint proxy statement and on their investor site.
• For Sun Country's info: See their 2025 Annual Meeting proxy filed on April 25, 2025, and subsequent updates in Form 8-Ks from September 22, 2025, and October 30, 2025.
• Ownership Changes: Any changes in stock ownership by directors or executives are filed on Form 4 with the SEC.

🌍 Industry Context

This merger is part of ongoing consolidation in the airline industry, particularly among low-cost and ultra-low-cost carriers focused on leisure travel. Combining allows airlines to achieve greater scale, route network efficiency, and cost synergies to better compete in a highly competitive market.

👉 It signals that scale and network breadth are critical for survival and growth in the budget airline segment.

⚖️ Big Picture: Strengths & Risks

• 👍 Potential Strengths: The combined entity could have a stronger competitive position, a more diversified route network, and better purchasing power.
• ⚠️ Key Risks: Integration of two airlines is complex. Regulatory hurdles, cultural differences, and potential operational disruptions during the merger could impact performance.

🧠 The Analogy

This merger is like two popular regional grocery store chains deciding to combine. Instead of competing for the same neighborhood shoppers, they join forces to cover more towns, share distribution centers to cut costs, and offer a wider selection to customers, making the new, larger chain a tougher competitor against the national giants.

📇 Key Contacts & People

The filing provides specific contact information for investor inquiries and document requests.

• Allegiant Investor Relations:

  • Address: 1201 North Town Center Drive, Las Vegas, NV 89144
  • Website: https://ir.allegiantair.com/financials/sec-filings/default.aspx

• Sun Country Investor Relations:

  • Address: 2005 Cargo Road, Minneapolis, MN 55450
  • Website: https://ir.suncountry.com/financials/sec-filings

• SEC Ownership Disclosures:

  • Allegiant: https://www.sec.gov/edgar/browse/?CIK=1362468&owner=exclude
  • Sun Country: https://www.sec.gov/edgar/browse/?CIK=1743907&owner=exclude

🧩 Final Takeaway

This is a procedural filing about the shareholder vote for Allegiant's acquisition of Sun Country. The real story is the strategic combination of two budget leisure airlines, aiming to create a stronger competitor. Investors in both companies have received their ballots and the deal is moving toward a final close.