Which airline loyalty program innovation was the first to introduce the concept of 'tier status' with different levels of benefits based on flying frequency?

Airline and transportation loyalty programs have revolutionized how consumers engage with travel brands. These sophisticated marketing tools have evolved from simple mileage tracking to complex ecosystems that drive customer retention and brand loyalty. This poll tests your knowledge about a significant innovation in transportation loyalty programs that changed the industry landscape and influenced customer engagement strategies across sectors.

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American Airlines AAdvantage's Gold/Platinum tiers (1982)
United Airlines Mileage Plus Premier levels (1987)
British Airways Executive Club's tier structure (1991)
Delta Air Lines SkyMiles Medallion status (1995)