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7. Flanker Su-27
Joined the Service in 1977
Not retired: N/A
Price: $41.2 million
Sukhoi created the nimble twin-engine fighter jet, the Su-27, to rival American fourth-generation fighters like the F-15 Eagle and F-14 Tomcat. The jet's different versions can carry out almost any aerial warfare mission, and it is built for air superiority.

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Su-27 Flanker / Twitter.com / Milairpix
In 1977, the Soviet Union requested the Su-27. It was first presented after eight years. Flanker was the NATO reporting name assigned to the Su-27. There have been several variations of the Flanker, including the 30, 33, 34, 35, 37, and J-11. A licenced Chinese-built Su-27 variant is the Shenyang J-11.