Only 3 countries have managed to build 5th-generation fighters, but nearly a dozen are already working on 6th-gen jets

Some 20 years after their first appearance in the skies, fifth-generation fighters remain both the most advanced and rarest aircraft in service. Only four models from three countries — the US's F-22 and F-35, China's J-20, and Russia's Su-57 — have been officially introduced. But many other countries are determined to have their own next-generation models. At least nine countries are already developing sixth-generation aircraft, either on their own or in cooperation with other countries.

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