Ever since the first fighter jet took to the unfriendly skies at the tail end of World War II, they've been known for one thing over any other factor: speed. For many fighter jets, the faster they fly, the more survivable they are in combat, and there have been some truly fast jets introduced and operated by the world's militaries over the years. It took time for technology to progress until Chuck Yeager broke the sound barrier in 1947, and after that, fighter jet speed was measured in Mach, not miles per hour. Fighter jet speed became a common factor…