United Airline Plane appears to be a 737-900.
Checked all the other types and this seems to be the best match. United graphic lines up with blank space in windows - doesn't seem to match any other plane they fly.
When "enhanced" you can see outline of Stair/railings coming from direction of where the door is on a 737-900.
Also it appears we have a white male with shaved/bald head. Once enhanced it appears to show a caucasian over the seat back - and a bald head reflection in the rearview mirror.
Hopefully this help someone in their hunt for information on the USSS pic. I agree this is probably in a hanger due to lighting glares on plane.