Despite still operating in several countries, the MiG-21 is reaching the end of its service life. Aside from its aging airframe, improvements in radar tracking, avionics, missile, and air defense technologies, as well as developments in communication and information, mean that this aircraft will soon be (or already is) outclassed by newer jets.
India, the current largest operator, is in the process of retiring its MiG-21 fleet in favor of its homegrown HAL Tejas fighter. As India winds down its maintenance and repair requirements, other operators might soon have trouble keeping MiG-21s in the air, especially if they cannot find suppliers to keep the jets serviceable.
The MiG-21 has a colorful history, and it will be remembered as a favorite aircraft or a formidable opponent. Nevertheless, time and technology continue to march forward, and its age will necessitate retirement.
Nevertheless, because of its ubiquity, you can still find the MiG-21 as a gate guard or as a monument. Some enthusiasts and collectors will also keep them in their private fleets.
