Two tags currently exist for what seems the same purpose, with 10 and 45 questions, respectively.
There are a few question already (and likely could be more) regarding runway maintenance. In the future we could see things regarding NDB, VOR or other radio maintenance. Or ILS and glide scope.... Perhaps even GPS, so long as it relates to aviation.
Point being, there are a lot of systems being maintained that are not aircraft. I say we leave the tags separate.
I would recommend keeping the one with more questions (currently and by far [aircraft-maintenance])