There isn't a stationary seat.
The ride is a theater car and the whole car either moves as a flight simulator (during a normal show) or it doesn't move at all (during a movie only show).
If you want to go on a movie only, non-motion version, go when the ride is not busy and ask the first CM that you see if it is possible. There is a specific name for it (which I can't remember right now - it might have been maintenence mode ot a test mode). You don't need the name though, if you ask if it is possible to ride with no motion, the CMs will know what you are talking about.
You may be able to ride with a short wait, or they may tell you a time to come back. Basiscally they take a car that is functional, but not being used and turn off the motion components to just show the movie.