Which transportation company was the first to introduce a modern frequent flyer program, revolutionizing customer loyalty in the industry?

The transportation industry has seen significant innovation in customer loyalty programs, from airlines' frequent flyer miles to ride-sharing rewards. These programs have transformed how travelers choose transportation services and have become critical competitive advantages. Test your knowledge about one of the most influential transportation loyalty programs that changed industry standards and consumer expectations.

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American Airlines (with AAdvantage in 1981)
United Airlines (with Mileage Plus in 1979)
Delta Air Lines (with SkyMiles in 1980)
Southwest Airlines (with Rapid Rewards in 1978)