Which airline was the first to introduce a loyalty program that allowed passengers to earn miles through non-flight activities like credit card purchases and hotel stays?

Airline loyalty programs have evolved dramatically since their inception in the 1980s. As airlines seek to differentiate themselves in a competitive market, their loyalty programs have become sophisticated marketing tools that drive customer retention and increase revenue. This poll tests your knowledge about a groundbreaking innovation in airline loyalty program history that changed the industry's approach to customer loyalty and partnerships.

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American Airlines (AAdvantage program)
United Airlines (Mileage Plus program)
British Airways (Executive Club program)
Delta Air Lines (SkyMiles program)