Which airline first introduced the modern frequent flyer loyalty program that revolutionized transportation marketing and became the model for virtually all airline loyalty programs today?

The transportation industry has produced some of the most memorable advertising campaigns in history. Airlines particularly have mastered the art of brand storytelling to create emotional connections with travelers. This trivia question focuses on a groundbreaking airline marketing campaign that revolutionized customer loyalty programs and became a case study in successful transportation marketing.

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American Airlines (with AAdvantage in 1981)
United Airlines (with Mileage Plus in 1979)
Delta Air Lines (with SkyMiles in 1980)
British Airways (with Executive Club in 1982)