Which airline launched the first modern frequent flyer program that awarded miles based on distance flown?

Airline loyalty programs revolutionized how passengers interact with transportation companies and created a model that would later be adopted across many industries. These programs turned occasional flyers into brand loyalists and introduced the concept of 'miles as currency.' This poll tests your knowledge about the origins of these influential customer loyalty initiatives that changed the transportation industry forever.

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American Airlines with AAdvantage (1981)
United Airlines with Mileage Plus (1982)
Delta Air Lines with SkyMiles (1983)
Pan American World Airways with WorldPass (1979)