Which design innovation, introduced in the Boeing 707 in the late 1950s, fundamentally changed commercial aviation by addressing passenger comfort during long flights?

The transportation industry has seen remarkable innovations in aircraft design over the decades. Beyond the obvious technological advancements in engines and materials, subtle design elements have revolutionized both functionality and passenger experience. This trivia question focuses on a design innovation that transformed commercial aviation but often goes unnoticed by the average traveler. Test your knowledge about this significant product design evolution that changed how we fly!

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Pressurized cabin technology that allowed high-altitude flight without oxygen masks
Swept-wing design that improved fuel efficiency and speed
Overhead luggage compartments that eliminated ground crew baggage handling
Automatic landing system technology that reduced pilot workload