I know this is harping on semantics, but there is no such thing as a Private Pilot's License in the USA. And while this might be common vernacular, wouldn't it be more appropriate to encourage users to use the correct terminology? I think there is a distinction between license and certificate and the phrase "license" does not appear in any FAA publication. This is just a pet peeve of mine so feel free to down vote, but I think its worth consideration. Tag suggestions might be certification or ppc.
Looking at the questions tagged ppl I actually don't even see one that would really require the tag at all, as the questions are about regulations or training, not the actual certificate.
In fact, I can't really think of any questions that would be specific to a certain type of license.
There are questions about the privilege that a license confers, or the rules about obtaining a license, but those are regulation type questions.
I say that we just remove the tag altogether and make sure that the questions tag the appropriate regulatory authorities regulations or flight-training.
If there does turn out to be a need, we should probably just create private-pilot (along with commercial, atp, etc.) since that would be appropriate world-wide (even the FAA PTS refers repeatedly to "private pilot" without the word certificate attached).
Also, see the Meta question Tags airman-certification and flight-training are inconsistent for thoughts on how certification questions should be tagged.
It's true that there's no such thing as a "private pilot's license" in the FAA's terms, but there is such a thing as a "private pilot" and people ask me about my "pilot's license" because it's simply a more natural term, presumably by comparison to "driver's license".
Outside the US, "certificates" are usually "licenses" and PPL is a very common abbreviation so just removing it completely is probably not the best approach.
Whatever we settle on as the general "pilot's license" or "pilot training" tag, ppl would be a useful synonym at least (see this related question). PPC doesn't mean anything to me in an aviation context.
As far as I know,
PPL is a an internationally accepted moniker. I haven't done any research into whether a
ppl tag is appropriate for any of the questions, but the fact remains there is a PPL pretty much everywhere (at least colloquially in the US, it's not uncommon to refer to a private pilot's certificate as a private pilot's license), as it is the name defined by ICAO. I don't think "private pilot's certificate" is used anywhere but the US, though. Calling this 'correct' terminology is, in a majority vote, probably wrong.
So either keep
PPL, or get rid of it, but in my humble opinion, I don't think there should be a
PPC tag. That said, I have to agree with Lnafziger that I can't really think of any questions where the tag would be appropriate, so probably better to remove it altogether.