Which airline's loyalty program, launched in 1981, is widely credited as the first modern frequent flyer program and revolutionized customer loyalty in the transportation industry?

Transportation loyalty programs have transformed how people travel and make transportation choices. These programs not only reward customer loyalty but have become sophisticated marketing tools that influence purchasing decisions across airlines, railways, ride-sharing services, and more. This trivia question explores a pivotal moment in transportation loyalty program history that forever changed the industry landscape and customer expectations.

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