[@bloonewb] The Legion includes more than just aeronauts, and there are a considerable number of aeronauts who are not in the Legion (pilots for merchant vessels, for ones that serve primarily as transportation, etc).  It's terribly misleading to call it anything involving aeronauts, as much as I wanted a guild for them.  =/  My guess is that being a ship captain or pilot confers a certain status separate from any guild membership, but there is no guild solely for aeronauts.