Which aviation product innovation, first widely implemented during World War II, revolutionized fighter aircraft performance and remains a fundamental component in modern military jets?

Throughout military history, aircraft design and innovation have revolutionized combat strategies. From World War I biplanes to modern stealth fighters, aviation technology has been at the forefront of military advancement. This poll tests your knowledge about a critical product innovation that fundamentally changed aerial warfare and influenced military aircraft design for decades to come. Do you know your military aviation history well enough to identify this game-changing innovation?

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Jet engines
Pressurized cabins
Retractable landing gear
Radar targeting systems