Something Fly In The Dawning Sky.

Another shot of the my "Dawn" smart phone photography series (yeah the next one) is my cherry pie photo - not so colorful and composition-able, but registering strange comet-like "whitey trail", but moving not upside down. I didn't saw airplane with zoom in, nor other "chem trails" over there approx. 1 hour...
Any Ideas? (I bet on airplane for the time present, but I am not professional pilot or photographer :-) )