In "Unimatrix Zero" (Season 6, Episode 26 and Season 7, Episode 27 of Star Trek: Voyager), one of Voyager's shuttles, the Delta Flyer, gets shot to pieces. But by the next episode (s7 ep2, "Imperfection"), they're using the Delta Flyer again. It's not like it was just an inconsistency that the writers were hoping that the audience would ignore - Tom Paris makes explicit reference to this at one point when he tells Captain Janeway that the last time she "went after the Borg" in that shuttlecraft, "it ended up in thousands of tiny pieces." So does anybody know how they have the Delta Flyer back/repaired at all, much less that quickly? It doesn't seem like it would have been able to recover at all from being as thoroughly destroyed as it was.
According to Wiki, Unimatrix Zero Part 2(S7,EP1) plays around Stardate 54014.4. The following EP2 plays around Stardate 54058.6 which is more than 2 weeks later. Initially, they designed and build the Delta Flyer from scratch in approximately less than a week under the pressure of the Malon also building a shuttle to steal Voyagers probe. While they don’t have the same pressure to get the Flyer back as fast as possible, I would still consider it being a very high priority. Hence, repair or rebuilding the flyer in about 2 weeks seems realistic and achievable.