Which airline first introduced the modern in-flight duty-free shopping experience in 1950, revolutionizing the concept of retail in transportation?

While we take shopping at 30,000 feet for granted today, the concept of in-flight retail transformed the passenger experience and created an entirely new revenue stream for airlines. This trivia question explores the origins of sky-high shopping and how one airline pioneered what would become a global transportation retail phenomenon worth billions annually. Test your knowledge about this intersection of transportation and retail innovation!

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Scandinavian Airlines System (SAS)
Pan American World Airways (Pan Am)
Trans World Airlines (TWA)
British Overseas Airways Corporation (BOAC)