The 340th Fighter Squadron is an inactive United States Air Force unit. It was last assigned to the 348th Fighter Group, based at Itami Air Base, Japan. It was inactivated on 10 May 1946.
Constituted 341st Fighter Squadron on 24 September 1942
Activated on 30 September 1942
Inactivated on 10 May 1946
Redesignated 141st Fighter Squadron, and allotted to New Jersey ANG on 24 May 1946.
348th Fighter Group, 30 September 1942 – 10 May 1946.
Mitchel Field, New York, 30 September 1942
Bradley Field, Connecticut, 30 September 1942
Westover Field, Massachusetts, 30 October 1942
Hillsgrove AAF, Rhode Island, 11 January 1943
Westover Field, Massachusetts, 29 April – 9 May 1943
Jackson Airfield (7 Mile Drome), Port Moresby, New Guinea, 23 June 1943
Finschafen Airfield (Dreger Field), New Guinea, 17 December 1943
Saidor Airfield, New Guinea, 27 March 1944
Wakde Airfield, Wakde, Netherlands East Indies, 22 May 1944
Kornasoren (Yebrurro) Airfield Noemfoor, Netherlands East Indies, 24 August 1944
Tacloban Airfield, Leyte, Philippines, 30 November 1944
Tanauan Airfield, Leyte, Philippines, c. 15 December 1944
San Marcelino Airfield, Leyte, Philippines, 7 February 1945
Floridablanca Airfield (Basa Air Base), Luzon, Philippines, c. 15 May 1945
Ie Shima Airfield, Okinawa, 12 July 1945
Kanoya Airfield, Japan, 9 September 1945
Itami Airfield, Japan, c. 20 October 1945 – 10 May 1946.
P-47 Thunderbolt, 1942–1945
P-51 Mustang, 1945-1946.
Combat in Southwest and Western Pacific, 30 July 1943 – 15 August 1945.
