Which airline is credited with launching the world's first frequent flyer loyalty program in 1981, revolutionizing customer retention in transportation?

Airline loyalty programs have transformed how people travel and how carriers build customer relationships. These programs have evolved from simple mileage trackers to complex ecosystems offering diverse rewards and partnerships. Test your knowledge about the history and innovation of these influential transportation loyalty schemes that have become crucial marketing tools in the competitive airline industry.

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