Welcome to Tomnod. It would be helpful to know what campaign you were working in, as well as the image number, in order to better answer your question. A preliminary guess is; it does appear to be an aircraft in flight, however, until the image number is provided, a further look might give an answer. - ake (Tn Moderator)
The white is probably sand, limestone or some other type of rock. The pointed dark form to the lower left looks like the shadow of a tree.
I am thinking sunlight reflecting off the top of a tree.