I'm with Tom
"10 min on the web with a search engine"...well, I don't know how long it took Tom, but I spent an hour on the Web pursuing my theory that the pic shows either an airborne observatory like SOFIA, or the inside of an AWACS or other military surveillance plane. Came up dry, not surprising since you'd expect pics of the interior of military spy planes to be rather rare. I failed to identify it as one thing or another.
Just to keep the facts straight, Lindy's entire post was "Chemtrail <drums>? Anyone recognize the airliner?", not "OMG!1CHEMTRAILS!!11!!". Phrased as a question, not a statement of fact. She asked for help identifying the picture.