Which company introduced the first widely successful modern customer loyalty program in 1981, revolutionizing retail marketing with a system that tracked customer purchases and awarded 'miles' that could be redeemed for products?

The concept of customer loyalty programs has a fascinating history in retail. Long before digital points and smartphone apps, merchants were finding innovative ways to encourage repeat business. This trivia question explores a pivotal moment in the evolution of formal customer loyalty initiatives that fundamentally changed how businesses approached customer retention and would eventually influence modern marketing strategies worldwide.

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American Airlines (AAdvantage program)
Sears with its 'Shop and Earn' program
S&H Green Stamps
American Express with its Membership Rewards