Which airline is credited with launching the first modern frequent flyer program that used accumulated miles as currency for free flights?

Airline and travel loyalty programs have revolutionized the transportation industry, creating new business models and changing customer expectations forever. These programs have inspired similar initiatives across hotels, rental cars, and even ride-sharing services. Test your knowledge about the origins of these influential customer retention strategies that have become central to transportation economics and marketing.

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American Airlines (AAdvantage, 1981)
United Airlines (Mileage Plus, 1982)
Delta Air Lines (SkyMiles, 1983)
British Airways (Executive Club, 1988)