The term small passenger ship (or SSP, for "small starship, passenger") was the general designation for passenger liners less than 100 meters long, carrying up to 500 passengers. The precise definition of the classification varied somewhat in different sectors, but apart from the basic constriants of size and capacity, the only limit that the Galactic Empire placed on the SSP classification was that a ship had to operate under a license from the governor on the specific planet where it claimed its home port. The planetary administration was responsible for ensuring that the ship satisfied Imperial safety regulations, and also for levying appropriate fees and dues from it.