There were a handfull of things you could call super weapons of WW-II and the two most notable could easily be the B29 and the P51. The P51 basically turned a sort of a tide against the Luftwaffe and Nazi Germany; it was the escort fighter which managed the impossible job of making it to all bombing targets while retaining the ability to defeat German fighters when they got there.
Please don’t forget the Hell Cat. It was an awsome plane.