There is a window. Look on the roof of the Plane in the first photo, you can clearly see the shadow of the open hatch/door cast complete with window upon the roof of the plane.
Now, find the origin of the shadow ... where it meets the door. See how you are looking at the open edge of the door? That makes it look like the last window between the door and the tail look like a door, when in fact it is a window.
OK, I see the shadow on the top of the plane. So that must be the open door, as you say - rather than a sliding door.
So this could be the same plane.
But if so, then where are all the people?