If there is anything we need to preserve than it is the wales for example or plant and animal life in general. Not if it dies out naturally but if the messed up humans are responsible for it.
Who the hell cares about a bit of metal? You could easily rebuild it today, with modern machines faster than ever.
That said there is something you need to keep in mind. Metal can only take so much stress and there will be structural integrity issues. While every metal is elastic it will fail at some point and just tear. Thus you can't really keep those planes alive in their original state anyways. They weren't meant to last. Nothing in engineering is.
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