Largest Airline Loyalty Programs Ranked by Membership (simpleflying.com)

American Airlines AAdvantage ranks third with 115 million members, a figure announced in April 2021 for the program's 40th anniversary. Southwest Rapid Rewards reached nearly 100 million members in second-quarter 2026 results, with new enrollments up 35% year over year, while IAG Avios reported over 70 million enrolled members in its 2025 annual report and issued 200 billion Avios that year. LATAM Pass counted roughly 54 million members as of December 31, 2025, a 9% increase, with about 35% considered active, followed by Lufthansa Miles & More at over 36 million and Air France-KLM Flying Blue at more than 35 million.