Which airline first introduced the concept of 'status miles' (separate from redeemable miles) that allowed passengers to earn elite status based on distance flown rather than just trips taken?

Airline loyalty programs have evolved significantly since their inception in the 1980s, becoming sophisticated marketing tools that drive customer retention in the highly competitive transportation industry. These programs use various strategies to reward frequent flyers, from mile accumulation to tiered status levels with exclusive perks. Test your knowledge about a groundbreaking loyalty program innovation that changed how airlines approach customer retention.

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American Airlines with AAdvantage in 1988
United Airlines with Mileage Plus in 1990
Delta Air Lines with SkyMiles in 1987
British Airways with Executive Club in 1991