Which airline was the first to introduce a tiered status system in their loyalty program that offered different levels of benefits based on miles flown?

Airline loyalty programs have evolved significantly over the decades, introducing innovative features to retain customers and enhance the travel experience. While many programs focus on miles and points, some airlines have pioneered unique approaches that changed the industry landscape. Test your knowledge about a groundbreaking loyalty program innovation that transformed how frequent flyers earn and redeem their rewards.

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American Airlines (AAdvantage)
United Airlines (Mileage Plus)
British Airways (Executive Club)
Delta Air Lines (SkyMiles)