The dark area behind and in the same horizontal line as the wing is the Valley of Fire lava fields -- the youngest lava field on the North American Continent. This particular set of images is from a recreational plane-chase exercise in Otero County, New Mexico. The region flown lies between Alamogordo, NM and Ruidoso, NM. Shooting this set of images was a bit of a challenge, aside from freezing in the cockpit, the Autofocus kept malfunctioning so I had to focus the "old-Fashioned-Way" for most of the flight. So much for technology! ;-)
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