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There are also companies that will recondition a DC-3 so thoroughly that from a regulatory perspective it is considered a zero-hour airframe.

Most applicable user name for a comment on HN, ever.

>DC-3 is unpressurized

The dumbass in me is asking how one breathes safely flying an unpressurized aircraft? Or is it flying at much lower altitude?

The second. Ceiling is 23000 feet. That's pretty chilly and heady though, usually they fly much lower than that, above a certain height (8K night, 10K day) you'd have to wear an oxygen mask.

You can view videos of a charter service, Buffalo Airways, maintaining and operating DC-3's here:

https://www.youtube.com/c/MikeyMcBryan/videos

They have their own DC-3 parts inventory. His father discusses buying truckloads of parts at auction back in the day in one video, which are worth 10x now.