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Love it (some of the dark areas seem to have lost their detail though)! Can you share the actions you used?
I can't replicate the above
however, the action it started with was the Surface Detail action I linked to. The rest, well, I call it messing around. All I remember was I duplicated the image in various layers and worked with blending modes (harsh light, darken, etc) and did a black and white layer as overlay.
You asked for clean sky - I went back to raw and redid it "by the book" with surface detail action, with and without the sky masked, and yes, it looks better with the sky unmolested.
First, pretty much straight out of Camera Raw, just some contrast adjustments and sensor spot cleanup (the D7000 I had spit more oil than a Harley)
now with the surface detail action applied just to the plane