Which airline first introduced the concept of 'frequent flyer miles' that revolutionized customer loyalty in transportation?

Airline loyalty programs have become a cornerstone of customer retention strategy in the transportation industry. These programs generate billions in revenue through partnerships with credit cards, hotels, and retailers while creating sticky customer relationships. Test your knowledge about one of the most successful airline loyalty innovations that changed the industry forever.

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American Airlines (with AAdvantage in 1981)
United Airlines (with Mileage Plus in 1979)
Delta Air Lines (with SkyMiles in 1980)
Pan American World Airways (with WorldPass in 1978)