Which customer feedback technology was first widely adopted by major airlines to track passenger satisfaction in real-time during flights?

The transportation industry has evolved dramatically in how it collects and utilizes customer feedback. From traditional comment cards to sophisticated AI-driven systems, understanding how passengers feel about their journey experiences has become crucial for service optimization. This trivia question explores an innovative feedback technology that transformed how transportation companies understand their customers' experiences in real-time.

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Sentiment analysis systems that monitor social media mentions during flights
In-flight entertainment systems with embedded satisfaction surveys
Bluetooth beacons that track passenger movements to identify bottlenecks
Facial recognition cameras that assess passenger emotions throughout the journey