 There are a number of companies based at the Airport offering a wide range of flying and aircraft related services.The airfield was originally established in April 1941 as a relief landing ground (RLG) for RAF Aldergrove.Later that year on 15 September RAF St Angelo opened as a fighter sector station in its own right, operating Spitfires and Hurricanes to intercept enemy reconnaissance aircraft off the west coast of Ireland and in the air defence role over Belfast.