Question: With which airport does this Royal Australian Air Force (RAAF) military air base, which had No. 4 Forward Air Control Flight Royal Australian Air Force unit, share the runway facilities with?
Sentence (from "No. 4 Forward Air Control Flight RAAF"): The Flight was formed on 1 April 1970 at RAAF Base Williamtown and was equipped with four CAC Winjeel aircraft.
Relevant evidence: Yes