Which transportation company was the first to introduce a loyalty program that allowed customers to earn points based on distance traveled rather than money spent?

Airline loyalty programs revolutionized how transportation companies retain customers, but they've evolved significantly since their introduction. The concept has spread to other transportation sectors with unique innovations. This trivia question tests your knowledge about a groundbreaking moment in transportation loyalty program history that changed customer engagement strategies industry-wide.

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American Airlines with AAdvantage (1981)
Greyhound with Road Rewards (1978)
United Airlines with Mileage Plus (1980)
Japan Railways with JR East (1975)