Which design innovation in commercial aircraft introduced in the late 1960s/early 1970s revolutionized the economics of air travel by dramatically increasing passenger capacity and reducing cost-per-seat?

Aviation product design has transformed the transportation industry through innovative solutions to complex challenges. From materials science to aerodynamics, strategic design decisions have revolutionized how we travel by air. This trivia question focuses on a pivotal design innovation that fundamentally changed commercial aviation economics and passenger experience. Test your knowledge about this transformative product design decision that airlines worldwide have embraced.

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Wide-body (twin-aisle) aircraft design, first implemented in the Boeing 747
Glass cockpit instrumentation with digital displays replacing analog gauges
Composite materials replacing traditional aluminum aircraft structures
Fly-by-wire control systems eliminating mechanical linkages to control surfaces