The Germans still had a number of FW-200 Condors that possibly could have been modified to carry a bomb.
The FW 200 was the first airplane to make a non-stop flight between Berlin and New York City (1938). Of course, that was one way, but the United States was reachable.
Possibly an even more capable German aircraft for that kind of duty was the Junkers Ju 290. It was the basis for the Amerika Bomber project, and had just enough range to make a round trip flight.
Then there was the Me 264...
It never really got very far, but the prototypes had a range of almost 10,000 miles!
That said, we're getting off topic here, and we've got to slew it back.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.