Which transportation company's loyalty program was the first to introduce the concept of 'miles' as a reward currency, fundamentally changing how consumers choose travel providers?

Loyalty programs have revolutionized how transportation companies retain customers, but some innovations stand out more than others. This trivia question focuses on a groundbreaking loyalty program that changed consumer behavior in the transportation industry and inspired similar programs across multiple sectors. Test your knowledge about how customer retention strategies transformed travel and transportation economics!

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American Airlines (AAdvantage program, 1981)
United Airlines (Mileage Plus program, 1979)
Delta Air Lines (SkyMiles program, 1980)
Pan American World Airways (WorldPass program, 1976)