33.
None of the windows open in the Presidential State Car except for the driver’s window. And even then, that only opens 3 inches! The obvious answer as to ‘Why?’ is safety. You don’t want anything happening just cause someone inside wanted a breeze. But beyond that obvious explanation, remember that the glass is five inches thick. What kind of custom-made machinery would they need to implement in the seven-inch thick doors to get the window to roll down in the first place?