Which airline was the first to introduce a frequent flyer loyalty program that allowed customers to earn miles based on distance traveled?

The transportation industry, particularly airlines, has pioneered some of the most sophisticated loyalty programs in business. These programs have evolved dramatically since their inception, introducing innovative features that have transformed how customers engage with transportation brands. Test your knowledge about the evolution of these influential loyalty programs that have shaped customer retention strategies across industries.

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American Airlines (AAdvantage program, 1981)
United Airlines (Mileage Plus, 1982)
Delta Air Lines (SkyMiles, originally known as Frequent Flyer, 1983)
British Airways (Executive Club, 1982)