Which airline loyalty program was the first to introduce the concept of 'miles' as a currency that could be accumulated and redeemed for free flights?

In the competitive transportation industry, loyalty programs have become essential tools for customer retention. Airlines, rideshare companies, and transit systems all vie for customer loyalty through innovative rewards systems. Some programs have revolutionized the industry with their pioneering approaches and massive customer bases. Test your knowledge about one of the most influential transportation loyalty programs that changed how we think about travel rewards!

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American Airlines AAdvantage (1981)
United Airlines Mileage Plus (1979)
Delta Air Lines SkyMiles (1983)
British Airways Executive Club (1974)