Hmmm
I had a problem with this story. Summed up in one word. Airships.
Now, I love a good time travel story, and I like the debate about "butterfly problems". But really it was a mash-note for Airship Worshippers, of which I am not. Yeah, it's clever that he stopped Hitler by means of something other than a bullet, but he did it using the father of airships.
Airships are beautiful and graceful, but they are NOT a good alternative to airplanes. They are at the mercy of the weather to a far greater degree than an airplane, and they can hardly match an airplane for either speed or carrying capacity. Air travel would have been less "democratic" than it was in the 1950s.
And yeah, maybe he's happy that he's in a golden age of airships, but the author doesn't seem to indicate that this is going to end. And it would (on top of whatever world political problems might or might not have been caused, which IMHO is more interesting then "Horray! Airships!")