Which aircraft design innovation first implemented in the 1970s significantly reduced fuel consumption and transformed the transportation industry?

Commercial aircraft design has evolved dramatically over the decades, with manufacturers constantly pushing boundaries in efficiency, comfort, and sustainability. This poll tests your knowledge about a significant product design innovation that revolutionized the commercial aviation industry and continues to influence modern aircraft development. Can you identify the correct breakthrough from these options?

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

High-bypass turbofan engines
Carbon fiber fuselage construction
Fly-by-wire control systems
Winglets at the ends of wings