Which airline was the first to implement a comprehensive biometric boarding system that allowed passengers to board without showing IDs or boarding passes at select US airports?

The transportation industry has undergone remarkable transformations in customer experience over recent years. From airline apps that streamline the entire journey to ride-sharing platforms that revolutionized urban mobility, transportation companies are constantly innovating to enhance customer satisfaction. This trivia question focuses on a groundbreaking customer experience initiative that significantly impacted passenger satisfaction in the aviation sector. Test your knowledge about transportation industry innovations!

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Delta Air Lines
United Airlines
American Airlines
JetBlue Airways