Which airline launched the world's first frequent flyer program in 1981, forever changing travel marketing?

Airline loyalty programs have revolutionized how travelers choose carriers and how airlines retain customers. These programs now generate billions in revenue through partnerships with credit cards, hotels, and retailers. But do you know which airline pioneered this marketing innovation? Test your knowledge of this transportation industry game-changer that transformed passenger loyalty and created a model that virtually every major airline has since adopted.

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American Airlines (AAdvantage)
United Airlines (Mileage Plus)
Delta Air Lines (SkyMiles)
Pan American World Airways (WorldPass)