Which airline innovation fundamentally transformed transportation loyalty programs by introducing the concept of 'status tiers' that rewarded elite travelers with differential benefits?

Airline loyalty programs revolutionized the transportation industry and set standards for customer retention across sectors. These programs have evolved dramatically from simple frequent flyer miles to complex ecosystems that influence consumer behavior and brand loyalty. Test your knowledge about how transportation companies have innovated in the loyalty space and the impact these programs have had on the industry.

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American Airlines' AAdvantage program in 1981
Southwest Airlines' Rapid Rewards in 1992
British Airways' Executive Club in 1988
United Airlines' Mileage Plus in 1990