Which airline was the first to introduce a revenue-based loyalty program (where points earned are based on dollars spent rather than miles flown), revolutionizing the industry standard?

The transportation industry has seen significant evolution in how airlines retain customers through loyalty programs. These programs have transformed from simple frequent flyer miles to complex ecosystems of partnerships and tiered benefits. Test your knowledge about a groundbreaking loyalty innovation that changed how travelers interact with airlines and influenced loyalty programs across multiple industries.

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Delta Air Lines with SkyMiles (2014)
Virgin America with Elevate (2007)
Southwest Airlines with Rapid Rewards (2011)
JetBlue with TrueBlue (2009)