"Walter Luffman" wrote in message ...

Any aircraft can be maintained in serviceable condition indefinitely
if one is willing to pay the costs. With the B-52 fleet, virtually
every part on every bird has been replaced more than once; that gets
very expensive when parts are specific to a particular aircraft type
that has been out of production for decades.

What's the biggest part that's been replaced? Have they replaced main
spars on the wing (and can that be done without a total wing rebuild)?