Plane that dropped the first atomic bomb on Hiroshima in 1945 (5,3)
I believe the answer is:
enola gay
(Other definitions for enola gay that I've seen before include "B-twenty nine that dropped the Hiroshima bomb" , "Hiroshima B-29" , "Bomber" , "B-twenty-nine that dropped Hiroshima bomb" , "Aircraft dropping Hiroshima bomb" .)