Which airline's sustainable loyalty program allows passengers to earn extra miles by choosing carbon-offset flights and was the first to introduce a tiered reward system based on sustainable travel choices?

The transportation industry is undergoing massive changes as sustainability becomes a priority. Companies are innovating with new loyalty programs, technologies, and practices to reduce their environmental impact while maintaining customer satisfaction. Test your knowledge about how transportation providers are implementing sustainability initiatives and what results they're seeing in consumer engagement and brand loyalty.

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• Air France-KLM's 'Flying Blue Sustainable'
• Lufthansa's 'GreenMiles'
• Delta's 'SkyMiles Earth'
• Singapore Airlines' 'KrisFlyer Green'

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