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. https://nationalinterest.org/blog/buzz/it-could-fly-100-years-meet-mig-21-fighter-45752
blog article
IT COULD FLY FOR 100 YEARS: MEET THE MIG-21 FIGHTER
The MiG-21 will easily reach sixty, however, and probably seventy without breaking a sweat. It remains one of the iconic fighters of the supersonic age. Military aircraft can have notoriously short lifespans, especially during periods of technological ferment. The most elite aircraft of World War I could become obsolete in a matter of months. Things weren’t much different in World War II. And at the dawn of the jet age, entire fleets of aircraft became passé as technologies matured. The advanced fighters that fought in the skies over Korea became junk just a few years later. ROBERT FARLEY READ MORE