I've seen this picture before on the Nexusboard, were it was described as a large
Mistel, intended for an attack on the US homeland. Besides the doubtful source,
there are other points of criticism, I think. It would have been purely a one-off
combination, so a one-off mission, but quite a large effort for it. A float plane version
of the Bf 109 was never developed and why it would have been used here is hard to see,
I think. It just would have increased drag and reduced performance. For saving the pilot,
additional flotation gear would have done the same. But perhaps the intention was to land
right in New York harbour after the demolition of the Statue Of Liberty. And then, landing
a floatplane and leaving it at the pier, saluting in front of hundreds of reporters would have
looked much better, of course !