Which aircraft is widely credited with revolutionizing commercial aviation by introducing the concept of 'economy class' and making air travel affordable for the middle class in the 1950s?

The transportation industry has seen remarkable technological advancements that have revolutionized how we travel. Commercial aviation, in particular, has evolved dramatically since its early days. This trivia question focuses on a pivotal innovation that changed the economics and accessibility of air travel forever, making it possible for millions more people to experience flight. Test your knowledge of this transformative product development!

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Boeing 707
Douglas DC-3
Lockheed Constellation
de Havilland Comet