Old 666 was a Boeing B-17E Flying Fortress heavy bomber, serial number 41-2666, assigned to the United States Army Air Forces (USAAF) 19th and 43rd Bombardment Groups in 1942–1943. It is notable for being the aircraft piloted by Lt. Col. (then Captain) Jay Zeamer Jr. on the 16 June 1943 mission which earned him and 2nd Lt. Joseph Sarnoski each a Medal of Honor, and all other members of the aircrew the Distinguished Service Cross.