Which transportation company pioneered the first modern frequent flyer program that awarded 'miles' as a loyalty currency, fundamentally changing customer loyalty in the industry?

Customer loyalty programs have revolutionized the transportation industry, from airlines to rideshare services. These programs not only encourage repeat business but have evolved into sophisticated ecosystems that shape consumer behavior and generate valuable data. This trivia question tests your knowledge about a groundbreaking loyalty innovation that changed the industry forever.

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American Airlines (AAdvantage program, 1981)
United Airlines (Mileage Plus program, 1983)
Pan American World Airways (WorldPass program, 1979)
British Airways (Executive Club program, 1982)