Which airline's loyalty program was the first to introduce the concept of 'frequent flyer miles' that revolutionized transportation marketing?

In the competitive transportation industry, airline loyalty programs have revolutionized how passengers choose carriers. These programs represent one of the most successful customer retention strategies in transportation history, turning occasional flyers into dedicated brand advocates. Test your knowledge about these powerful marketing tools that keep passengers coming back to specific airlines despite similar service offerings across carriers.

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American Airlines (AAdvantage)
United Airlines (Mileage Plus)
Delta Air Lines (SkyMiles)
Pan American World Airways (WorldPass)