Which airline launched the first modern frequent flyer loyalty program that became the model for transportation loyalty programs worldwide?

Airline loyalty programs revolutionized how transportation companies build customer relationships. Today, these programs drive billions in revenue and shape consumer behavior across the transportation industry. Test your knowledge about the origins of these influential programs that have become essential business models for airlines, railways, ride-sharing services, and other transportation providers.

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