I'll try to remember everything I've done on this one, I accidentally closed it after saving it
.
First, I ran this
Vintage Film Action
Then I duplicated the picture as a new layer and set it to Color Burn
Then I did a little dodging and burning on a layer filled with 50% grey and set to Overlay
Next I selected the sky area and created a new layer and set it to Color. I painted it with a blue tone, then adjusted the Hue / Saturation to make the blue look more washed out in line with the rest of the image.
Finally I used a high pass sharpening layer on the image.
I think that's everything