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 Mills in July 1969. Sion Mills Cricket Club plays in the North West Senior League. The River Mourne was the reason that Herdman's Mill was built in Sion Mills, County Tyrone. It was founded in 1835 and is a large complex of now listed buildings, the most prominent of which was built in 1853 by William Henry Lynn of Lanyon, Lynn and Lanyon, Belfast. This is a very large and handsome five-storey mill built in Italianate style of grey ashlar stone quarried locally, with yellow brick extensions added in 1884 to 1900. There had been a series of corn mills on