&gt; So while American B-52s have been heroically kept operating since the 50s and 60s, Russian Air Force Tu-95s were all built in the 80s and early 90s with assorted design improvements and new avionics.<p>I&#x27;d expect modern B-52s are mostly Ships of Theseus and that little of the original avionics, wiring, metal, etc. still exist.