While the bus system is a hub-and-spoke paradigm, it is more akin to a traditional aviation hub-and-spoke model than to the traditional public transit hub-and-spoke model because it has multiple hubs, both primary and secondary in nature, with the routes themselves usually being non-stop. The four theme parks, Magic Kingdom, Epcot, Disney's Hollywood Studios, and Disney's Animal Kingdom, as well as Disney Springs, operate as the five primary hubs. Each of the four theme parks has service to the 22 resorts, as well as to the other parks. Disney Springs has service only to the resorts, except for one-way service from the theme parks to Disney Springs after 4 p.m. Bus service is not provided on some routes served by monorail or watercraft, for example between Epcot and the Magic Kingdom, and between the Magic Kingdom or Epcot to resorts on the monorail line.