What a beautiful shot! I love how clear yet uncertain this photo is. I feel like the black and white certainly contributes to this feeling. I just love seeing raw nature shot like this, it makes me want to visit this area and experience this same flight.
The misty/smoggy? day makes the image look very lovely. I bet it was a lot of fun flying over such pretty terrain.
If I had to critique something I'd say the mid-bottom right side is quite dark and un-balanced to its bright opposite (top left). The hill points towards the darkness and makes my eyes feel 'tired' and want to leave the image. That the white 'strip' above it does the same only reinforces that. I'd say it should have been cropped a bit earlier.
Another alternative (just a suggestion) is to crop both sides so that the dip from the left-middle hills are the main focus/center. The horizon would still be at the 1/3 top, so it'd keep some interest.
It was absolutely gorgeous, though the mist killed a lot of the photos. Very hard to find a clear shot.
I do see what you're saying about the dark-to-light contrast, though I personally enjoyed it. Though I do really appreciate your comment about it, I will consider editing it slightly to make that change. If not, it's something to consider for next time!