Which retail innovation was FIRST widely implemented in airports and transportation hubs, dramatically changing how travelers shop?

The transportation industry has seen remarkable retail innovations at travel hubs like airports, train stations, and rest stops. These innovations have transformed the passenger experience while creating new revenue streams. This poll tests your knowledge about a groundbreaking retail innovation that changed how travelers shop while on the move. Can you identify which technology first revolutionized transportation retail?

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Walk-through duty-free stores with mandatory passenger routing (1960s)
Automated self-checkout kiosks for quick purchases (1990s)
Mobile order-ahead apps with gate/platform delivery (2010s)
Virtual shopping walls with QR code purchasing (2000s)