Which airline launched the world's first modern frequent flyer program, revolutionizing customer loyalty in the transportation industry?

Loyalty programs are a cornerstone of customer retention in the transportation industry, particularly for airlines. These programs have evolved significantly since their inception, offering increasingly sophisticated ways to reward frequent travelers. This trivia question tests your knowledge about the birth of airline loyalty programs that revolutionized how we think about customer retention in the transportation sector.

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American Airlines (AAdvantage)
United Airlines (Mileage Plus)
British Airways (Executive Club)
Pan American World Airways (WorldPass)