“Airport hydrant fuel distribution system” means a UST system that fuels aircraft and operates under high pressure with large diameter piping that begins where fuel enters one or more tanks from an external source such as a pipeline, barge, rail car, or other motor fuel carrier, and terminates at one or more hydrants, also known as fill stands.

Source. #12643, eff 10-10-18 (See Revision Note #2 at chapter heading for Env-Or 400)