I'm afraid you're not going to find a font that will be convincing on its own. Applying the effect to soft font like Bryant is the best way to go.

Reminds me of an old typeface from Casady & Greene called Giotto. But, now that I've found it, the A and K are completely different. Looks to me like they used step & repeat on a blue line to create this effect.

You could perhaps use Handsome, it's a fully-connected OpenType script that has a range of monoline weights.

Maybe take the Thin, convert to outline and texture-paint the path in Illustrator with dots, then import into PS and blur.

I recommend you to experiment with different "cloudy" photoshop-brushes and draw the text by hand. Some irregularity is a good thing here.

You haven't a clue about sky writing its not a continious line like the old biplanes. What they do is make a series of dashes that form letters as they fly. An example would be an I being created from four verticle dashes with space in between each. A N would be the same four verticle dashes but with one dash after it at the number 2 level and another at the number 3 level then 4 more dashes. I will see If I can find an example I made a number of years ago in Photoshop.

Use some cloud brushes - there's some great ones here.
Then mask the layer with a font you like.
Then gaussian blur the mask to soften it a little and use soft brushes in the mask to make some irregularities…

peace

Thanks to all--I will try out the cloud brushes.