Which customer service innovation did Delta Air Lines introduce in 2016 that revolutionized baggage tracking and significantly improved the retail customer experience in air travel?

The transportation industry is rapidly evolving with new technologies enhancing customer experiences. From mobile apps for real-time tracking to AI-powered service solutions, companies are finding innovative ways to serve passengers and shippers better. This trivia tests your knowledge about a groundbreaking customer service innovation that changed how a major transportation company interacts with its customers. Can you identify the genuine industry breakthrough from the plausible alternatives?

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RFID baggage tracking system with real-time updates through their mobile app, allowing passengers to track luggage throughout the entire journey
AI-powered automated compensation system that instantly credits passengers' accounts for delayed baggage without requiring claims submission
Blockchain-based baggage security system that creates immutable records of baggage handling, preventing loss and unauthorized access
Voice-activated baggage concierge service that allows passengers to report and locate missing bags through smart speakers at terminals