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.