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Well you can’t really recondition the airframes. Rather there’s a set LOV (limits of validity), or number of flight hours at a certain loading where the airplane has to be retired. Proper maintenence, regular tear downs, and frequent inspections ensure that the LOV is maxed out before retirement. The last KC-135 rolled off the factory floor in 1965, yet they’re still the primary air refuelers in the US arsenal to this day thanks to how well they were constructed at the time.
Here’s a helpful reference:
https://en.m.wikipedia.org/wiki/Widespread_fatigue_damage
That is amazing. wow considering the stresses those Wings and fuselage are subjected too.