Sion Airport PC-6, Pilatus PC-7, Pilatus PC-9 and Pilatus PC-21 as well as helicopters it uses Sion intensively with the fighter jets F/A-18 and F-5 Tiger. It is the home base of the militia pilot unit Fliegerstaffel 19 Swans with F-5E. Sion Airport is, at both ends of the runway, equipped with retractable arresting gear devices (used by the F/A-18 and in case of a problem by the F-5). Because of the redimension of the Swiss Air Force it is planned that the Air Force will leave Sion after 2017 and Sion will be used by civil aviation only, acting only as
Sion Hill also contains a brick tenant house, "circa" 1790, with two rooms on each of two levels. The house originally featured formal gardens, now largely lost. The property preserves expansive views of Chesapeake Bay and the town of Havre de Grace. The house was listed for sale on 9/11/2018 for 1.2 million dollars. Sion Hill Sion Hill is a National Historic Landmark in Havre de Grace, Maryland, notable as an example of high-style Federal architecture and as the home of a family of prominent officers of the United States Navy. Work began at Sion Hill around 1785 for the Rev. John