Which transportation company launched the first modern frequent flyer program that became the model for loyalty programs across industries?

The transportation industry has developed some of the most innovative and successful loyalty programs in the business world. These programs have revolutionized how consumers choose their preferred transportation methods and have become crucial revenue drivers for companies. Test your knowledge about the history and impact of transportation loyalty programs with this challenging question!

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American Airlines (AAdvantage, 1981)
United Airlines (Mileage Plus, 1982)
Delta Air Lines (SkyMiles, 1983)
British Airways (Executive Club, 1988)