Which airline was the first to introduce a loyalty program that allowed passengers to earn miles based on dollars spent rather than distance flown, revolutionizing the industry's approach to customer loyalty?

In the competitive transportation industry, airlines are constantly evolving their loyalty programs to enhance brand loyalty and improve customer retention. These programs have become sophisticated marketing tools that influence consumer behavior and travel choices. This trivia question tests your knowledge about a groundbreaking loyalty program innovation that changed how airlines approach customer loyalty and mobile commerce.

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Delta Air Lines (SkyMiles program, 2014)
United Airlines (MileagePlus program, 2015)
American Airlines (AAdvantage program, 2016)
Southwest Airlines (Rapid Rewards program, 2011)