Lineage. Constituted as 309 Pursuit Squadron (Interceptor) on 21 Jan 1942. Activated on 30 Jan 1942. Redesignated: 309 Fighter Squadron on 15 May 1942; 309 Fighter Squadron, Single Engine, on 20 Aug 1943. Inactivated on 7 Nov 1945. Activated on 20 Aug 1946. Redesignated: 309 Fighter Squadron, Jet,