Wreckage of some historic aircraft may be retained by the owners or acquired by others and, after a decent interval, rebuilt to fly.
I can think of at least four Spitfires involved in fatal acccidents, one of which has been airworthy again for some time and the other three are well on their way - and a further two which are I think are stored.
Mustangs are another hardy breed, and often reappear given plenty of time, expertise and money. I saw a US registered Mustang visiting the UK in 1977 which has subsequently been involved in three major accidents, two of them fatal, and I think I read recently that it is once again in the jigs somewhere in Europe.