Russia's Zhukovsky Air Base may be forced to permanently retire it's last MiG-21 jet fighter. Officials have been unable to locate replacement wings for the aging jet. Unless they locate a brand new set of wings in someone's garage somewhere, the incredible jet will be permanently grounded. Boo, hoo. The MiG-21 is (was) a great single-engine fighter and was often called "a test pilot's first love".