Which company introduced the first widely successful modern loyalty program in 1981, fundamentally changing retail customer retention strategies?

While loyalty programs are ubiquitous in today's retail landscape, they have a fascinating historical origin that revolutionized consumer behavior and marketing strategies. This trivia question explores the emergence of one of the earliest and most influential customer loyalty initiatives that would forever change how businesses interact with their customers and build brand loyalty.

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American Airlines with AAdvantage
S&H Green Stamps
Sears with the Sears Card
Macy's Customer Loyalty Program