Which transportation company pioneered the first successful frequent flyer program that revolutionized customer loyalty in the travel industry?

The transportation industry has seen significant retail innovations that have transformed how customers purchase tickets, book services, and interact with travel brands. From airline loyalty programs to revolutionary pricing strategies, the retail side of transportation has evolved dramatically. Test your knowledge of how major transportation companies have pioneered retail concepts that changed the industry landscape!

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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)