I presume you use prop planes- being of course the Germans developed Jet fighters in WWII
Please, for the love of god, go get an education and learn some history before you make claims. Hell, just do a search on Google first !
Planes were not invented for the military, like most things the military found a use for them but they were looked down on at first. The Jet Engine was invented by the Englishman Whittle and the know-how given to America as part of the deal during the war. The Germans may have invented one too but if they did it was later. They invented the rocket engine and did most of the early development (and it was German engineers who provided much of the know-how for Amertica and Russia during the post-war space-race)