I've heard so many different versions of how it can be accomplished.
1- Just buid a bomber that is also a seaplane, land in the North Atlantic and be refueled by U-Boats.
2- Make it a one way trip, after the bombing run fly back over the Atlantic and crash land on the water at a predetermined spot and the crew to be picked up by U-Boats.
Simple plans, nothing could go wrong with those great Hitler plans. Hitler was obsessed with bombing NYC with the idea that Americans would be so afraid of German air power, they would demand that our government withdraw from the Allies.
Kind of like the Japanese plans to use balloons to fly from Japan and carry bombs which when they landed and exploded they would start mamouth forest fires to incinerate the Pacific Coast. They planned on usingt 10,000 of these balloon bombs. They made and released 2,000 and about 200 landed in the West, in Canada and one made it to either Indiana or Michigan. A few fires were set but the Japanese didn't figure on the wet rainy season on the Pacific Coast. Most fires just fizzled out. A group of boy scouts on a camping trip found one and six were killed when they handled it and it went off. Five scouts and the wife of the scout master were killed.
The reason they tinkered with it was because nobody outside our government knew anything about these bombs. A news blackout was clamped down and not a peep appeared in any newspaper, not even the New York Times...

. The Japanese never found out that any of these bombs made it to the USA and they cancelled the rest of the program. They had counted on the forest fires to scare us so much, we would all just give up and if that hapened we'd all be driving Honda's, Toyota's, and we'd all be listening th Sony radios and TV's..........wait a minute
The best laid plans to often go astray.
TTT
Sometimes I am the windshield, sometimes, I am the bug.