I do work with Aviation clients and my manager said he heard that there was an 18b symbology within the ArcGIS for Aviation extension. Based on my research into the product/extensions and GP Tools, I don't think that there is one.
ArcGIS for Aviation does not include a specific FAA 18B symbology style. It does include an AirportMarkings.style and an eALP.style which Airport users may find helpful. But these are not specifically tied to any FAA 18B CADD standards. ArcGIS for Aviation: Charting users may find the included PLTS_ICAO.style, Enroute.style, and the AACDTD.style files helpful.
