Which company introduced the first modern customer loyalty program in 1981 that became the model for many programs we see today?

Customer loyalty programs have become a cornerstone of modern retail strategy, but their history spans back further than many realize. These programs revolutionized how businesses retained customers and gathered consumer data. This trivia question explores a pivotal moment in the history of retail loyalty initiatives that shaped today's shopping landscape and customer retention strategies.

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American Airlines (AAdvantage)
S&H Green Stamps
Sears & Roebuck
Sperry & Hutchinson