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

Airline loyalty programs have revolutionized how people travel, offering points, miles, and perks to frequent flyers. These programs have become sophisticated marketing tools that influence consumer behavior and brand loyalty in the transportation industry. This trivia question tests your knowledge about which airline first introduced this game-changing concept that has since been adopted across the transportation sector and beyond.

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