Which company launched the first modern retail loyalty program in 1981 that rewarded frequent flyers with miles that could be exchanged for free flights?

In today's competitive retail landscape, customer loyalty programs are essential business tools. From punch cards to sophisticated mobile apps, these programs have evolved dramatically over the decades. But do you know which pioneering company first revolutionized modern retail loyalty with a program that would change customer retention strategies forever? Test your knowledge of retail history and customer engagement strategies with this challenging question!

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American Airlines (AAdvantage)
Macy's (with their store credit card rewards)
S&H Green Stamps (retail trading stamps)
American Express (with their Membership Rewards)