Avfuel-branded dealer Threshold Aviation has announced the completion of renovations to its FBO facility with ample ramp and hangar space. The upgraded FBO is part of Threshold Group’s commitment to steady expansion, and marks just one of many ongoing additions and projects that are planned. Indeed, the aviation service company has even started building a separate sales, service and installation center for the re-engined Citation-II’s with Clifford Development Group. (Clifford tapped Threshold as their service center in August of 2007.)