Which transportation loyalty program was the first to introduce the concept of 'miles' as a currency that could be earned and redeemed, now widely copied across the industry?

The transportation industry has adopted many customer loyalty innovations from retail. Loyalty programs have become a critical competitive advantage for airlines, rideshare companies, and other transit providers. This poll tests your knowledge about a groundbreaking loyalty program that fundamentally changed how transportation companies approach customer retention and revolutionized the entire industry's approach to frequent travelers.

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American Airlines AAdvantage (1981)
United Airlines Mileage Plus (1983)
Delta SkyMiles (1995)
Southwest Rapid Rewards (1992)