Gary,
The window sill is that hard, thick metal bottom of the window channel where the window itself slides down out of sight. It's what you sit on while explaining to airport lurkers how wonderful Coupes are. The Coupe's correct on-the-ground attitude is defined by the level window sill rather than the tail height. (We use the tail height as a quick-and-dirty [but pretty good] way of eyeballing how close the plane is to level.) Ed
