Which airline became the first major U.S. carrier to make a multi-billion dollar investment in sustainable aviation fuel (SAF) in 2021, committing to purchase 1 billion gallons?

The transportation industry is rapidly evolving to address environmental concerns, with airlines implementing various sustainability initiatives. One particularly significant milestone in sustainable aviation fuel (SAF) adoption occurred in recent years, marking a turning point for the industry's environmental commitments. Test your knowledge about this important development in transportation sustainability that's reshaping how airlines approach their environmental impact.

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• United Airlines
• Delta Air Lines
• American Airlines
• Southwest Airlines

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